fix(preview): only show browser-ready local servers#6021

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Merged
maria-rcks merged 2 commits into from
Aug 14, 2026
Merged

fix(preview): only show browser-ready local servers #6021

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44432e9
fix(preview): only show browser-ready local servers
chrisdeeming Aug 10, 2026
7de1c4e
refactor(preview): drop local server status indicator
chrisdeeming Aug 10, 2026
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557 changes: 532 additions & 25 deletions apps/server/src/preview/PortScanner.test.ts
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336 changes: 305 additions & 31 deletions apps/server/src/preview/PortScanner.ts
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22 changes: 15 additions & 7 deletions apps/server/src/ws.ts
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Original file line numberDiff line numberDiff line change
Expand Up@@ -2115,23 +2115,31 @@ const makeWsRpcLayer = (
observeRpcStream(WS_METHODS.subscribePreviewEvents, previewManager.events, {
"rpc.aggregate": "preview",
}),
[WS_METHODS.subscribeDiscoveredLocalServers]: (_input) =>
[WS_METHODS.subscribeDiscoveredLocalServers]: (input) =>
observeRpcStream(
WS_METHODS.subscribeDiscoveredLocalServers,
Stream.callback<DiscoveredLocalServerList>((queue) =>
Effect.gen(function* () {
const configuredUrls = input.configuredUrls ?? [];
yield* portDiscovery.retain;
const initial = yield* portDiscovery.scan();
const initial = yield* portDiscovery.scan(configuredUrls);
const initialScannedAt = DateTime.formatIso(yield* DateTime.now);
yield* Queue.offer(queue, {
servers: initial,
scannedAt: initialScannedAt,
configuredUrlProbing: true,
});
yield* portDiscovery.subscribe((servers) =>
Effect.gen(function* () {
const scannedAt = DateTime.formatIso(yield* DateTime.now);
yield* Queue.offer(queue, { servers, scannedAt });
}),
yield* portDiscovery.subscribe(
{ configuredUrls, initialSnapshot: initial },
(servers) =>
Effect.gen(function* () {
const scannedAt = DateTime.formatIso(yield* DateTime.now);
yield* Queue.offer(queue, {
servers,
scannedAt,
configuredUrlProbing: true,
});
}),
);
}),
),
Expand Down
2 changes: 0 additions & 2 deletions apps/web/src/components/preview/PreviewEmptyState.test.tsx
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Expand Up@@ -12,7 +12,6 @@ const mocks = vi.hoisted(() => ({
pid: number | null;
terminal: null;
source: "scanner";
listening: boolean;
}>,
}));

Expand All@@ -34,7 +33,6 @@ function server(port: number) {
pid: 1,
terminal: null,
source: "scanner" as const,
listening: true,
};
}

Expand Down
9 changes: 3 additions & 6 deletions apps/web/src/components/preview/PreviewEmptyState.tsx
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Original file line numberDiff line numberDiff line change
Expand Up@@ -11,7 +11,6 @@ import { useDiscoveredLocalServers } from "./useDiscoveredLocalServers";
interface Props {
environmentId: EnvironmentId;
configuredUrls?: ReadonlyArray<string> | undefined;
recentlySeenUrls?: ReadonlyArray<string> | undefined;
recentEntries: ReadonlyArray<BrowserHistoryEntry>;
onRemoveRecent: (url: string) => void;
onOpenUrl: (url: string) => void;
Expand All@@ -20,15 +19,13 @@ interface Props {
export function PreviewEmptyState({
environmentId,
configuredUrls,
recentlySeenUrls,
recentEntries,
onRemoveRecent,
onOpenUrl,
}: Props) {
const servers = useDiscoveredLocalServers({
environmentId,
configuredUrls,
recentlySeenUrls,
});
const recents = recentEntries.filter((entry) => URL.canParse(entry.url)).slice(0, 8);

Expand All@@ -40,7 +37,7 @@ export function PreviewEmptyState({
</EmptyMedia>
<EmptyTitle>No preview yet</EmptyTitle>
<EmptyDescription>
Type a URL above, or run a dev script. Listening localhost ports will show up here
Type a URL above, or run a dev script. Browser-ready localhost servers will show up here
automatically.
</EmptyDescription>
</Empty>
Expand All@@ -49,7 +46,7 @@ export function PreviewEmptyState({

return (
<div className="flex h-full min-h-0 overflow-y-auto px-5 py-8">
<div className="m-auto flex w-full max-w-xl flex-col gap-6">
<div className="mx-auto flex w-full max-w-xl flex-col gap-6">
{recents.length > 0 ? (
<div className="flex flex-col gap-3">
<div className="flex items-center gap-2 text-sm text-muted-foreground">
Expand DownExpand Up@@ -84,7 +81,7 @@ export function PreviewEmptyState({
))}
</div>
<p className="px-1 text-xs text-muted-foreground">
Select a listening port to open it in this browser tab.
Select a live local server to open it in this browser tab.
</p>
</div>
) : null}
Expand Down
23 changes: 1 addition & 22 deletions apps/web/src/components/preview/PreviewLocalServerCard.tsx
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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,32 +21,11 @@ export function PreviewLocalServerCard({ server, onOpen }: Props) {
{server.host}:{server.port}
</span>
</div>
{server.listening ? <PulsingDot /> : <DimDot />}
</button>
);
}

function describeServer(server: PreviewableServer): string {
if (server.processName) return server.processName;
if (server.listening) return "Listening";
if (server.source === "configured") return "Configured";
return "Recently seen";
}

function PulsingDot() {
return (
<span aria-label="Listening" className="relative inline-flex size-2 shrink-0">
<span className="absolute inset-0 animate-status-ping rounded-full bg-success opacity-60" />
<span className="relative inline-flex size-2 rounded-full bg-success" />
</span>
);
}

function DimDot() {
return (
<span
aria-label="Not currently listening"
className="size-2 shrink-0 rounded-full bg-muted-foreground/40"
/>
);
return "Listening";
}
1 change: 0 additions & 1 deletion apps/web/src/components/preview/PreviewView.tsx
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Original file line numberDiff line numberDiff line change
Expand Up@@ -712,7 +712,6 @@ export function PreviewView({
<PreviewEmptyState
environmentId={threadRef.environmentId}
configuredUrls={configuredUrls}
recentlySeenUrls={previewState.recentlySeenUrls}
recentEntries={recentHistoryEntries}
onRemoveRecent={(url) => removeUrlForThread(threadRef, url)}
onOpenUrl={(next) => void handleOpenServerUrl(next)}
Expand Down
113 changes: 60 additions & 53 deletions apps/web/src/components/preview/useDiscoveredLocalServers.test.ts
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Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
import type { DiscoveredLocalServer } from "@t3tools/contracts";
import { describe, expect, it } from "vite-plus/test";

import { mergeServers, type PreviewableServer } from "./useDiscoveredLocalServers";
import { mergeServers } from "./useDiscoveredLocalServers";

const scannerServer = (
overrides: Partial<DiscoveredLocalServer & { requestedUrl: string }>,
Expand All@@ -21,15 +21,13 @@ describe("mergeServers", () => {
const result = mergeServers({
scanner: [scannerServer({})],
configuredUrls: [],
recentlySeenUrls: [],
});
expect(result).toHaveLength(1);
expect(result[0]).toMatchObject({
host: "localhost",
port: 5173,
requestedUrl: "http://localhost:5173",
source: "scanner",
listening: true,
processName: "vite",
});
});
Expand All@@ -38,102 +36,111 @@ describe("mergeServers", () => {
const result = mergeServers({
scanner: [scannerServer({ port: 5173, processName: "node", pid: 9999 })],
configuredUrls: ["http://localhost:5173"],
recentlySeenUrls: [],
});
expect(result).toHaveLength(1);
expect(result[0]).toMatchObject({
port: 5173,
source: "configured",
listening: true,
processName: "node",
pid: 9999,
});
});

it("keeps configured entries that the scanner doesn't see, with listening=false", () => {
it("excludes configured entries that the live scanner doesn't see", () => {
const result = mergeServers({
scanner: [],
configuredUrls: ["http://localhost:5173"],
recentlySeenUrls: [],
});
expect(result).toHaveLength(1);
expect(result[0]).toMatchObject({
source: "configured",
listening: false,
requestedUrl: "http://localhost:5173/",
});
});

it("dedupes recently-seen URLs against scanner+configured entries", () => {
const result = mergeServers({
scanner: [scannerServer({ port: 5173 })],
configuredUrls: [],
recentlySeenUrls: ["http://localhost:5173/", "http://localhost:8080/"],
});
expect(result.map((s) => s.port)).toEqual([5173, 8080]);
expect(result.find((s) => s.port === 5173)?.source).toBe("scanner");
expect(result.find((s) => s.port === 8080)?.source).toBe("recent");
expect(result.find((s) => s.port === 8080)?.requestedUrl).toBe("http://localhost:8080/");
expect(result).toHaveLength(0);
});

it("ignores non-loopback URLs in configured/recent inputs", () => {
it("ignores non-loopback configured URLs", () => {
const result = mergeServers({
scanner: [],
scanner: [scannerServer({})],
configuredUrls: ["https://example.com", "ws://localhost:5173"],
recentlySeenUrls: ["https://api.example.com"],
});
expect(result).toHaveLength(0);
expect(result).toHaveLength(1);
expect(result[0]?.source).toBe("scanner");
});

it("sorts: configured before scanner before recent, then by port", () => {
it("sorts configured live servers before scanner-only servers", () => {
const result = mergeServers({
scanner: [scannerServer({ port: 8080 }), scannerServer({ port: 3000 })],
configuredUrls: ["http://localhost:5173"],
recentlySeenUrls: ["http://localhost:9000/", "http://localhost:4321/"],
configuredUrls: ["http://localhost:8080"],
});
expect(result.map((s) => `${s.source}:${s.port}`)).toEqual([
"configured:5173",
"scanner:3000",
"scanner:8080",
"recent:4321",
"recent:9000",
]);
expect(result.map((s) => `${s.source}:${s.port}`)).toEqual(["configured:8080", "scanner:3000"]);
});

it("dedupes by lowercased host", () => {
const result = mergeServers({
scanner: [scannerServer({ host: "Localhost", port: 5173 })],
configuredUrls: ["http://localhost:5173"],
recentlySeenUrls: [],
});
expect(result).toHaveLength(1);
expect(result[0]?.source).toBe("configured");
});

it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
it.each(["127.0.0.1", "0.0.0.0", "[::1]"])(
"matches configured loopback alias %s to a live localhost server",
(host) => {
const result = mergeServers({
scanner: [
scannerServer({ requestedUrl: `http://localhost:5173/dashboard?mode=test#results` }),
],
configuredUrls: [`http://${host}:5173/dashboard?mode=test#results`],
});
expect(result).toHaveLength(1);
expect(result[0]?.source).toBe("configured");
expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
},
);

it("keeps the scanner-verified path and protocol", () => {
const result = mergeServers({
scanner: [
scannerServer({
port: 5173,
url: "https://env-42.example.dev:5173/",
requestedUrl: "http://localhost:5173/",
requestedUrl: "http://localhost:5173/dashboard?mode=test#results",
}),
],
configuredUrls: [],
recentlySeenUrls: [],
configuredUrls: ["https://localhost:5173/dashboard?mode=test#results"],
});
expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
});

it("overlays a configured path when an older server does not advertise path probing", () => {
const result = mergeServers({
scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
configuredUrls: ["https://localhost:5173/docs?mode=test#results"],
configuredUrlProbing: false,
});

expect(result[0]?.requestedUrl).toBe("https://localhost:5173/docs?mode=test#results");
});

it("does not overlay an unverified configured path when the server probes paths", () => {
const result = mergeServers({
scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
configuredUrls: ["http://localhost:5173/docs"],
configuredUrlProbing: true,
});

expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
});
});

describe("PreviewableServer interface", () => {
it("preserves listening flag through enrichment", () => {
it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
const result = mergeServers({
scanner: [scannerServer({})],
configuredUrls: ["http://localhost:5173"],
recentlySeenUrls: [],
scanner: [
scannerServer({
port: 5173,
url: "https://env-42.example.dev:5173/",
requestedUrl: "http://localhost:5173/",
}),
],
configuredUrls: [],
});
const merged: PreviewableServer | undefined = result[0];
expect(merged?.listening).toBe(true);
expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
});
});
Loading
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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fix(preview): only show browser-ready local servers#6021

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 Merged

maria-rcks
merged 2 commits into

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Aug 14, 2026
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fix(preview): only show browser-ready local servers
#6021
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44432e9

fix(preview): only show browser-ready local servers


chrisdeeming Aug 10, 2026
7de1c4e

refactor(preview): drop local server status indicator


chrisdeeming Aug 10, 2026

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557 changes: 532 additions & 25 deletions
apps/server/src/preview/PortScanner.test.ts

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336 changes: 305 additions & 31 deletions
apps/server/src/preview/PortScanner.ts

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22 changes: 15 additions & 7 deletions
apps/server/src/ws.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -2115,23 +2115,31 @@ const makeWsRpcLayer = (
 observeRpcStream(WS_METHODS.subscribePreviewEvents, previewManager.events, {
 "rpc.aggregate": "preview",
 }),
 [WS_METHODS.subscribeDiscoveredLocalServers]: (_input) =>
 [WS_METHODS.subscribeDiscoveredLocalServers]: (input) =>
 observeRpcStream(
 WS_METHODS.subscribeDiscoveredLocalServers,
 Stream.callback<DiscoveredLocalServerList>((queue) =>
 Effect.gen(function* () {
 const configuredUrls = input.configuredUrls ?? [];
 yield* portDiscovery.retain;
 const initial = yield* portDiscovery.scan();
 const initial = yield* portDiscovery.scan(configuredUrls);
 const initialScannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers: initial,
 scannedAt: initialScannedAt,
 configuredUrlProbing: true,
 });
 yield* portDiscovery.subscribe((servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, { servers, scannedAt });
 }),
 yield* portDiscovery.subscribe(
 { configuredUrls, initialSnapshot: initial },
 (servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers,
 scannedAt,
 configuredUrlProbing: true,
 });
 }),
 );
 }),
 ),
Expand Down

2 changes: 0 additions & 2 deletions
apps/web/src/components/preview/PreviewEmptyState.test.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -12,7 +12,6 @@ const mocks = vi.hoisted(() => ({
 pid: number | null;
 terminal: null;
 source: "scanner";
 listening: boolean;
 }>,
}));

Expand All@@ -34,7 +33,6 @@ function server(port: number) {
 pid: 1,
 terminal: null,
 source: "scanner" as const,
 listening: true,
 };
}

Expand Down

9 changes: 3 additions & 6 deletions
apps/web/src/components/preview/PreviewEmptyState.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -11,7 +11,6 @@ import { useDiscoveredLocalServers } from "./useDiscoveredLocalServers";
interface Props {
 environmentId: EnvironmentId;
 configuredUrls?: ReadonlyArray<string> | undefined;
 recentlySeenUrls?: ReadonlyArray<string> | undefined;
 recentEntries: ReadonlyArray<BrowserHistoryEntry>;
 onRemoveRecent: (url: string) => void;
 onOpenUrl: (url: string) => void;
Expand All@@ -20,15 +19,13 @@ interface Props {
export function PreviewEmptyState({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 recentEntries,
 onRemoveRecent,
 onOpenUrl,
}: Props) {
 const servers = useDiscoveredLocalServers({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 });
 const recents = recentEntries.filter((entry) => URL.canParse(entry.url)).slice(0, 8);

Expand All@@ -40,7 +37,7 @@ export function PreviewEmptyState({
 </EmptyMedia>
 <EmptyTitle>No preview yet</EmptyTitle>
 <EmptyDescription>
 Type a URL above, or run a dev script. Listening localhost ports will show up here
 Type a URL above, or run a dev script. Browser-ready localhost servers will show up here
 automatically.
 </EmptyDescription>
 </Empty>
Expand All@@ -49,7 +46,7 @@ export function PreviewEmptyState({

 return (
 <div className="flex h-full min-h-0 overflow-y-auto px-5 py-8">
 <div className="m-auto flex w-full max-w-xl flex-col gap-6">
 <div className="mx-auto flex w-full max-w-xl flex-col gap-6">
 {recents.length > 0 ? (
 <div className="flex flex-col gap-3">
 <div className="flex items-center gap-2 text-sm text-muted-foreground">
Expand DownExpand Up@@ -84,7 +81,7 @@ export function PreviewEmptyState({
 ))}
 </div>
 <p className="px-1 text-xs text-muted-foreground">
 Select a listening port to open it in this browser tab.
 Select a live local server to open it in this browser tab.
 </p>
 </div>
 ) : null}
Expand Down

23 changes: 1 addition & 22 deletions
apps/web/src/components/preview/PreviewLocalServerCard.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,32 +21,11 @@ export function PreviewLocalServerCard({ server, onOpen }: Props) {
 {server.host}:{server.port}
 </span>
 </div>
 {server.listening ? <PulsingDot /> : <DimDot />}
 </button>
 );
}

function describeServer(server: PreviewableServer): string {
 if (server.processName) return server.processName;
 if (server.listening) return "Listening";
 if (server.source === "configured") return "Configured";
 return "Recently seen";
}

function PulsingDot() {
 return (
 <span aria-label="Listening" className="relative inline-flex size-2 shrink-0">
 <span className="absolute inset-0 animate-status-ping rounded-full bg-success opacity-60" />
 <span className="relative inline-flex size-2 rounded-full bg-success" />
 </span>
 );
}

function DimDot() {
 return (
 <span
 aria-label="Not currently listening"
 className="size-2 shrink-0 rounded-full bg-muted-foreground/40"
 />
 );
 return "Listening";
}

1 change: 0 additions & 1 deletion
apps/web/src/components/preview/PreviewView.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -712,7 +712,6 @@ export function PreviewView({
 <PreviewEmptyState
 environmentId={threadRef.environmentId}
 configuredUrls={configuredUrls}
 recentlySeenUrls={previewState.recentlySeenUrls}
 recentEntries={recentHistoryEntries}
 onRemoveRecent={(url) => removeUrlForThread(threadRef, url)}
 onOpenUrl={(next) => void handleOpenServerUrl(next)}
Expand Down

113 changes: 60 additions & 53 deletions
apps/web/src/components/preview/useDiscoveredLocalServers.test.ts

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Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
import type { DiscoveredLocalServer } from "@t3tools/contracts";
import { describe, expect, it } from "vite-plus/test";

import { mergeServers, type PreviewableServer } from "./useDiscoveredLocalServers";
import { mergeServers } from "./useDiscoveredLocalServers";

const scannerServer = (
 overrides: Partial<DiscoveredLocalServer & { requestedUrl: string }>,
Expand All@@ -21,15 +21,13 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: [],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 host: "localhost",
 port: 5173,
 requestedUrl: "http://localhost:5173",
 source: "scanner",
 listening: true,
 processName: "vite",
 });
 });
Expand All@@ -38,102 +36,111 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173, processName: "node", pid: 9999 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 port: 5173,
 source: "configured",
 listening: true,
 processName: "node",
 pid: 9999,
 });
 });

 it("keeps configured entries that the scanner doesn't see, with listening=false", () => {
 it("excludes configured entries that the live scanner doesn't see", () => {
 const result = mergeServers({
 scanner: [],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 source: "configured",
 listening: false,
 requestedUrl: "http://localhost:5173/",
 });
 });

 it("dedupes recently-seen URLs against scanner+configured entries", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173 })],
 configuredUrls: [],
 recentlySeenUrls: ["http://localhost:5173/", "http://localhost:8080/"],
 });
 expect(result.map((s) => s.port)).toEqual([5173, 8080]);
 expect(result.find((s) => s.port === 5173)?.source).toBe("scanner");
 expect(result.find((s) => s.port === 8080)?.source).toBe("recent");
 expect(result.find((s) => s.port === 8080)?.requestedUrl).toBe("http://localhost:8080/");
 expect(result).toHaveLength(0);
 });

 it("ignores non-loopback URLs in configured/recent inputs", () => {
 it("ignores non-loopback configured URLs", () => {
 const result = mergeServers({
 scanner: [],
 scanner: [scannerServer({})],
 configuredUrls: ["https://example.com", "ws://localhost:5173"],
 recentlySeenUrls: ["https://api.example.com"],
 });
 expect(result).toHaveLength(0);
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("scanner");
 });

 it("sorts: configured before scanner before recent, then by port", () => {
 it("sorts configured live servers before scanner-only servers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 8080 }), scannerServer({ port: 3000 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: ["http://localhost:9000/", "http://localhost:4321/"],
 configuredUrls: ["http://localhost:8080"],
 });
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual([
 "configured:5173",
 "scanner:3000",
 "scanner:8080",
 "recent:4321",
 "recent:9000",
 ]);
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual(["configured:8080", "scanner:3000"]);
 });

 it("dedupes by lowercased host", () => {
 const result = mergeServers({
 scanner: [scannerServer({ host: "Localhost", port: 5173 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 });

 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 it.each(["127.0.0.1", "0.0.0.0", "[::1]"])(
 "matches configured loopback alias %s to a live localhost server",
 (host) => {
 const result = mergeServers({
 scanner: [
 scannerServer({ requestedUrl: `http://localhost:5173/dashboard?mode=test#results` }),
 ],
 configuredUrls: [`http://${host}:5173/dashboard?mode=test#results`],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 },
 );

 it("keeps the scanner-verified path and protocol", () => {
 const result = mergeServers({
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 requestedUrl: "http://localhost:5173/dashboard?mode=test#results",
 }),
 ],
 configuredUrls: [],
 recentlySeenUrls: [],
 configuredUrls: ["https://localhost:5173/dashboard?mode=test#results"],
 });
 expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 });

 it("overlays a configured path when an older server does not advertise path probing", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["https://localhost:5173/docs?mode=test#results"],
 configuredUrlProbing: false,
 });

 expect(result[0]?.requestedUrl).toBe("https://localhost:5173/docs?mode=test#results");
 });

 it("does not overlay an unverified configured path when the server probes paths", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["http://localhost:5173/docs"],
 configuredUrlProbing: true,
 });

 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});

describe("PreviewableServer interface", () => {
 it("preserves listening flag through enrichment", () => {
 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 }),
 ],
 configuredUrls: [],
 });
const merged: PreviewableServer | undefined = result[0];
 expect(merged?.listening).toBe(true);
expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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fix(preview): only show browser-ready local servers#6021

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 Merged

maria-rcks
merged 2 commits into

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Aug 14, 2026
 Merged


fix(preview): only show browser-ready local servers
#6021
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44432e9

fix(preview): only show browser-ready local servers


chrisdeeming Aug 10, 2026
7de1c4e

refactor(preview): drop local server status indicator


chrisdeeming Aug 10, 2026

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557 changes: 532 additions & 25 deletions
apps/server/src/preview/PortScanner.test.ts

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336 changes: 305 additions & 31 deletions
apps/server/src/preview/PortScanner.ts

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22 changes: 15 additions & 7 deletions
apps/server/src/ws.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -2115,23 +2115,31 @@ const makeWsRpcLayer = (
 observeRpcStream(WS_METHODS.subscribePreviewEvents, previewManager.events, {
 "rpc.aggregate": "preview",
 }),
 [WS_METHODS.subscribeDiscoveredLocalServers]: (_input) =>
 [WS_METHODS.subscribeDiscoveredLocalServers]: (input) =>
 observeRpcStream(
 WS_METHODS.subscribeDiscoveredLocalServers,
 Stream.callback<DiscoveredLocalServerList>((queue) =>
 Effect.gen(function* () {
 const configuredUrls = input.configuredUrls ?? [];
 yield* portDiscovery.retain;
 const initial = yield* portDiscovery.scan();
 const initial = yield* portDiscovery.scan(configuredUrls);
 const initialScannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers: initial,
 scannedAt: initialScannedAt,
 configuredUrlProbing: true,
 });
 yield* portDiscovery.subscribe((servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, { servers, scannedAt });
 }),
 yield* portDiscovery.subscribe(
 { configuredUrls, initialSnapshot: initial },
 (servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers,
 scannedAt,
 configuredUrlProbing: true,
 });
 }),
 );
 }),
 ),
Expand Down

2 changes: 0 additions & 2 deletions
apps/web/src/components/preview/PreviewEmptyState.test.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -12,7 +12,6 @@ const mocks = vi.hoisted(() => ({
 pid: number | null;
 terminal: null;
 source: "scanner";
 listening: boolean;
 }>,
}));

Expand All@@ -34,7 +33,6 @@ function server(port: number) {
 pid: 1,
 terminal: null,
 source: "scanner" as const,
 listening: true,
 };
}

Expand Down

9 changes: 3 additions & 6 deletions
apps/web/src/components/preview/PreviewEmptyState.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -11,7 +11,6 @@ import { useDiscoveredLocalServers } from "./useDiscoveredLocalServers";
interface Props {
 environmentId: EnvironmentId;
 configuredUrls?: ReadonlyArray<string> | undefined;
 recentlySeenUrls?: ReadonlyArray<string> | undefined;
 recentEntries: ReadonlyArray<BrowserHistoryEntry>;
 onRemoveRecent: (url: string) => void;
 onOpenUrl: (url: string) => void;
Expand All@@ -20,15 +19,13 @@ interface Props {
export function PreviewEmptyState({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 recentEntries,
 onRemoveRecent,
 onOpenUrl,
}: Props) {
 const servers = useDiscoveredLocalServers({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 });
 const recents = recentEntries.filter((entry) => URL.canParse(entry.url)).slice(0, 8);

Expand All@@ -40,7 +37,7 @@ export function PreviewEmptyState({
 </EmptyMedia>
 <EmptyTitle>No preview yet</EmptyTitle>
 <EmptyDescription>
 Type a URL above, or run a dev script. Listening localhost ports will show up here
 Type a URL above, or run a dev script. Browser-ready localhost servers will show up here
 automatically.
 </EmptyDescription>
 </Empty>
Expand All@@ -49,7 +46,7 @@ export function PreviewEmptyState({

 return (
 <div className="flex h-full min-h-0 overflow-y-auto px-5 py-8">
 <div className="m-auto flex w-full max-w-xl flex-col gap-6">
 <div className="mx-auto flex w-full max-w-xl flex-col gap-6">
 {recents.length > 0 ? (
 <div className="flex flex-col gap-3">
 <div className="flex items-center gap-2 text-sm text-muted-foreground">
Expand DownExpand Up@@ -84,7 +81,7 @@ export function PreviewEmptyState({
 ))}
 </div>
 <p className="px-1 text-xs text-muted-foreground">
 Select a listening port to open it in this browser tab.
 Select a live local server to open it in this browser tab.
 </p>
 </div>
 ) : null}
Expand Down

23 changes: 1 addition & 22 deletions
apps/web/src/components/preview/PreviewLocalServerCard.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,32 +21,11 @@ export function PreviewLocalServerCard({ server, onOpen }: Props) {
 {server.host}:{server.port}
 </span>
 </div>
 {server.listening ? <PulsingDot /> : <DimDot />}
 </button>
 );
}

function describeServer(server: PreviewableServer): string {
 if (server.processName) return server.processName;
 if (server.listening) return "Listening";
 if (server.source === "configured") return "Configured";
 return "Recently seen";
}

function PulsingDot() {
 return (
 <span aria-label="Listening" className="relative inline-flex size-2 shrink-0">
 <span className="absolute inset-0 animate-status-ping rounded-full bg-success opacity-60" />
 <span className="relative inline-flex size-2 rounded-full bg-success" />
 </span>
 );
}

function DimDot() {
 return (
 <span
 aria-label="Not currently listening"
 className="size-2 shrink-0 rounded-full bg-muted-foreground/40"
 />
 );
 return "Listening";
}

1 change: 0 additions & 1 deletion
apps/web/src/components/preview/PreviewView.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -712,7 +712,6 @@ export function PreviewView({
 <PreviewEmptyState
 environmentId={threadRef.environmentId}
 configuredUrls={configuredUrls}
 recentlySeenUrls={previewState.recentlySeenUrls}
 recentEntries={recentHistoryEntries}
 onRemoveRecent={(url) => removeUrlForThread(threadRef, url)}
 onOpenUrl={(next) => void handleOpenServerUrl(next)}
Expand Down

113 changes: 60 additions & 53 deletions
apps/web/src/components/preview/useDiscoveredLocalServers.test.ts

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Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
import type { DiscoveredLocalServer } from "@t3tools/contracts";
import { describe, expect, it } from "vite-plus/test";

import { mergeServers, type PreviewableServer } from "./useDiscoveredLocalServers";
import { mergeServers } from "./useDiscoveredLocalServers";

const scannerServer = (
 overrides: Partial<DiscoveredLocalServer & { requestedUrl: string }>,
Expand All@@ -21,15 +21,13 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: [],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 host: "localhost",
 port: 5173,
 requestedUrl: "http://localhost:5173",
 source: "scanner",
 listening: true,
 processName: "vite",
 });
 });
Expand All@@ -38,102 +36,111 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173, processName: "node", pid: 9999 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 port: 5173,
 source: "configured",
 listening: true,
 processName: "node",
 pid: 9999,
 });
 });

 it("keeps configured entries that the scanner doesn't see, with listening=false", () => {
 it("excludes configured entries that the live scanner doesn't see", () => {
 const result = mergeServers({
 scanner: [],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 source: "configured",
 listening: false,
 requestedUrl: "http://localhost:5173/",
 });
 });

 it("dedupes recently-seen URLs against scanner+configured entries", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173 })],
 configuredUrls: [],
 recentlySeenUrls: ["http://localhost:5173/", "http://localhost:8080/"],
 });
 expect(result.map((s) => s.port)).toEqual([5173, 8080]);
 expect(result.find((s) => s.port === 5173)?.source).toBe("scanner");
 expect(result.find((s) => s.port === 8080)?.source).toBe("recent");
 expect(result.find((s) => s.port === 8080)?.requestedUrl).toBe("http://localhost:8080/");
 expect(result).toHaveLength(0);
 });

 it("ignores non-loopback URLs in configured/recent inputs", () => {
 it("ignores non-loopback configured URLs", () => {
 const result = mergeServers({
 scanner: [],
 scanner: [scannerServer({})],
 configuredUrls: ["https://example.com", "ws://localhost:5173"],
 recentlySeenUrls: ["https://api.example.com"],
 });
 expect(result).toHaveLength(0);
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("scanner");
 });

 it("sorts: configured before scanner before recent, then by port", () => {
 it("sorts configured live servers before scanner-only servers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 8080 }), scannerServer({ port: 3000 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: ["http://localhost:9000/", "http://localhost:4321/"],
 configuredUrls: ["http://localhost:8080"],
 });
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual([
 "configured:5173",
 "scanner:3000",
 "scanner:8080",
 "recent:4321",
 "recent:9000",
 ]);
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual(["configured:8080", "scanner:3000"]);
 });

 it("dedupes by lowercased host", () => {
 const result = mergeServers({
 scanner: [scannerServer({ host: "Localhost", port: 5173 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 });

 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 it.each(["127.0.0.1", "0.0.0.0", "[::1]"])(
 "matches configured loopback alias %s to a live localhost server",
 (host) => {
 const result = mergeServers({
 scanner: [
 scannerServer({ requestedUrl: `http://localhost:5173/dashboard?mode=test#results` }),
 ],
 configuredUrls: [`http://${host}:5173/dashboard?mode=test#results`],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 },
 );

 it("keeps the scanner-verified path and protocol", () => {
 const result = mergeServers({
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 requestedUrl: "http://localhost:5173/dashboard?mode=test#results",
 }),
 ],
 configuredUrls: [],
 recentlySeenUrls: [],
 configuredUrls: ["https://localhost:5173/dashboard?mode=test#results"],
 });
 expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 });

 it("overlays a configured path when an older server does not advertise path probing", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["https://localhost:5173/docs?mode=test#results"],
 configuredUrlProbing: false,
 });

 expect(result[0]?.requestedUrl).toBe("https://localhost:5173/docs?mode=test#results");
 });

 it("does not overlay an unverified configured path when the server probes paths", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["http://localhost:5173/docs"],
 configuredUrlProbing: true,
 });

 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});

describe("PreviewableServer interface", () => {
 it("preserves listening flag through enrichment", () => {
 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 }),
 ],
 configuredUrls: [],
 });
const merged: PreviewableServer | undefined = result[0];
 expect(merged?.listening).toBe(true);
expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
fix(preview): only show browser-ready local servers#6021

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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 Merged

maria-rcks
merged 2 commits into

from

Aug 14, 2026
 Merged


fix(preview): only show browser-ready local servers
#6021
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44432e9

fix(preview): only show browser-ready local servers


chrisdeeming Aug 10, 2026
7de1c4e

refactor(preview): drop local server status indicator


chrisdeeming Aug 10, 2026

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557 changes: 532 additions & 25 deletions
apps/server/src/preview/PortScanner.test.ts

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336 changes: 305 additions & 31 deletions
apps/server/src/preview/PortScanner.ts

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22 changes: 15 additions & 7 deletions
apps/server/src/ws.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -2115,23 +2115,31 @@ const makeWsRpcLayer = (
 observeRpcStream(WS_METHODS.subscribePreviewEvents, previewManager.events, {
 "rpc.aggregate": "preview",
 }),
 [WS_METHODS.subscribeDiscoveredLocalServers]: (_input) =>
 [WS_METHODS.subscribeDiscoveredLocalServers]: (input) =>
 observeRpcStream(
 WS_METHODS.subscribeDiscoveredLocalServers,
 Stream.callback<DiscoveredLocalServerList>((queue) =>
 Effect.gen(function* () {
 const configuredUrls = input.configuredUrls ?? [];
 yield* portDiscovery.retain;
 const initial = yield* portDiscovery.scan();
 const initial = yield* portDiscovery.scan(configuredUrls);
 const initialScannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers: initial,
 scannedAt: initialScannedAt,
 configuredUrlProbing: true,
 });
 yield* portDiscovery.subscribe((servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, { servers, scannedAt });
 }),
 yield* portDiscovery.subscribe(
 { configuredUrls, initialSnapshot: initial },
 (servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers,
 scannedAt,
 configuredUrlProbing: true,
 });
 }),
 );
 }),
 ),
Expand Down

2 changes: 0 additions & 2 deletions
apps/web/src/components/preview/PreviewEmptyState.test.tsx

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -12,7 +12,6 @@ const mocks = vi.hoisted(() => ({
 pid: number | null;
 terminal: null;
 source: "scanner";
 listening: boolean;
 }>,
}));

Expand All@@ -34,7 +33,6 @@ function server(port: number) {
 pid: 1,
 terminal: null,
 source: "scanner" as const,
 listening: true,
 };
}

Expand Down

9 changes: 3 additions & 6 deletions
apps/web/src/components/preview/PreviewEmptyState.tsx

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -11,7 +11,6 @@ import { useDiscoveredLocalServers } from "./useDiscoveredLocalServers";
interface Props {
 environmentId: EnvironmentId;
 configuredUrls?: ReadonlyArray<string> | undefined;
 recentlySeenUrls?: ReadonlyArray<string> | undefined;
 recentEntries: ReadonlyArray<BrowserHistoryEntry>;
 onRemoveRecent: (url: string) => void;
 onOpenUrl: (url: string) => void;
Expand All@@ -20,15 +19,13 @@ interface Props {
export function PreviewEmptyState({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 recentEntries,
 onRemoveRecent,
 onOpenUrl,
}: Props) {
 const servers = useDiscoveredLocalServers({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 });
 const recents = recentEntries.filter((entry) => URL.canParse(entry.url)).slice(0, 8);

Expand All@@ -40,7 +37,7 @@ export function PreviewEmptyState({
 </EmptyMedia>
 <EmptyTitle>No preview yet</EmptyTitle>
 <EmptyDescription>
 Type a URL above, or run a dev script. Listening localhost ports will show up here
 Type a URL above, or run a dev script. Browser-ready localhost servers will show up here
 automatically.
 </EmptyDescription>
 </Empty>
Expand All@@ -49,7 +46,7 @@ export function PreviewEmptyState({

 return (
 <div className="flex h-full min-h-0 overflow-y-auto px-5 py-8">
 <div className="m-auto flex w-full max-w-xl flex-col gap-6">
 <div className="mx-auto flex w-full max-w-xl flex-col gap-6">
 {recents.length > 0 ? (
 <div className="flex flex-col gap-3">
 <div className="flex items-center gap-2 text-sm text-muted-foreground">
Expand DownExpand Up@@ -84,7 +81,7 @@ export function PreviewEmptyState({
 ))}
 </div>
 <p className="px-1 text-xs text-muted-foreground">
 Select a listening port to open it in this browser tab.
 Select a live local server to open it in this browser tab.
 </p>
 </div>
 ) : null}
Expand Down

23 changes: 1 addition & 22 deletions
apps/web/src/components/preview/PreviewLocalServerCard.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,32 +21,11 @@ export function PreviewLocalServerCard({ server, onOpen }: Props) {
 {server.host}:{server.port}
 </span>
 </div>
 {server.listening ? <PulsingDot /> : <DimDot />}
 </button>
 );
}

function describeServer(server: PreviewableServer): string {
 if (server.processName) return server.processName;
 if (server.listening) return "Listening";
 if (server.source === "configured") return "Configured";
 return "Recently seen";
}

function PulsingDot() {
 return (
 <span aria-label="Listening" className="relative inline-flex size-2 shrink-0">
 <span className="absolute inset-0 animate-status-ping rounded-full bg-success opacity-60" />
 <span className="relative inline-flex size-2 rounded-full bg-success" />
 </span>
 );
}

function DimDot() {
 return (
 <span
 aria-label="Not currently listening"
 className="size-2 shrink-0 rounded-full bg-muted-foreground/40"
 />
 );
 return "Listening";
}

1 change: 0 additions & 1 deletion
apps/web/src/components/preview/PreviewView.tsx

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -712,7 +712,6 @@ export function PreviewView({
 <PreviewEmptyState
 environmentId={threadRef.environmentId}
 configuredUrls={configuredUrls}
 recentlySeenUrls={previewState.recentlySeenUrls}
 recentEntries={recentHistoryEntries}
 onRemoveRecent={(url) => removeUrlForThread(threadRef, url)}
 onOpenUrl={(next) => void handleOpenServerUrl(next)}
Expand Down

113 changes: 60 additions & 53 deletions
apps/web/src/components/preview/useDiscoveredLocalServers.test.ts

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Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
import type { DiscoveredLocalServer } from "@t3tools/contracts";
import { describe, expect, it } from "vite-plus/test";

import { mergeServers, type PreviewableServer } from "./useDiscoveredLocalServers";
import { mergeServers } from "./useDiscoveredLocalServers";

const scannerServer = (
 overrides: Partial<DiscoveredLocalServer & { requestedUrl: string }>,
Expand All@@ -21,15 +21,13 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: [],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 host: "localhost",
 port: 5173,
 requestedUrl: "http://localhost:5173",
 source: "scanner",
 listening: true,
 processName: "vite",
 });
 });
Expand All@@ -38,102 +36,111 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173, processName: "node", pid: 9999 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 port: 5173,
 source: "configured",
 listening: true,
 processName: "node",
 pid: 9999,
 });
 });

 it("keeps configured entries that the scanner doesn't see, with listening=false", () => {
 it("excludes configured entries that the live scanner doesn't see", () => {
 const result = mergeServers({
 scanner: [],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 source: "configured",
 listening: false,
 requestedUrl: "http://localhost:5173/",
 });
 });

 it("dedupes recently-seen URLs against scanner+configured entries", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173 })],
 configuredUrls: [],
 recentlySeenUrls: ["http://localhost:5173/", "http://localhost:8080/"],
 });
 expect(result.map((s) => s.port)).toEqual([5173, 8080]);
 expect(result.find((s) => s.port === 5173)?.source).toBe("scanner");
 expect(result.find((s) => s.port === 8080)?.source).toBe("recent");
 expect(result.find((s) => s.port === 8080)?.requestedUrl).toBe("http://localhost:8080/");
 expect(result).toHaveLength(0);
 });

 it("ignores non-loopback URLs in configured/recent inputs", () => {
 it("ignores non-loopback configured URLs", () => {
 const result = mergeServers({
 scanner: [],
 scanner: [scannerServer({})],
 configuredUrls: ["https://example.com", "ws://localhost:5173"],
 recentlySeenUrls: ["https://api.example.com"],
 });
 expect(result).toHaveLength(0);
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("scanner");
 });

 it("sorts: configured before scanner before recent, then by port", () => {
 it("sorts configured live servers before scanner-only servers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 8080 }), scannerServer({ port: 3000 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: ["http://localhost:9000/", "http://localhost:4321/"],
 configuredUrls: ["http://localhost:8080"],
 });
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual([
 "configured:5173",
 "scanner:3000",
 "scanner:8080",
 "recent:4321",
 "recent:9000",
 ]);
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual(["configured:8080", "scanner:3000"]);
 });

 it("dedupes by lowercased host", () => {
 const result = mergeServers({
 scanner: [scannerServer({ host: "Localhost", port: 5173 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 });

 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 it.each(["127.0.0.1", "0.0.0.0", "[::1]"])(
 "matches configured loopback alias %s to a live localhost server",
 (host) => {
 const result = mergeServers({
 scanner: [
 scannerServer({ requestedUrl: `http://localhost:5173/dashboard?mode=test#results` }),
 ],
 configuredUrls: [`http://${host}:5173/dashboard?mode=test#results`],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 },
 );

 it("keeps the scanner-verified path and protocol", () => {
 const result = mergeServers({
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 requestedUrl: "http://localhost:5173/dashboard?mode=test#results",
 }),
 ],
 configuredUrls: [],
 recentlySeenUrls: [],
 configuredUrls: ["https://localhost:5173/dashboard?mode=test#results"],
 });
 expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 });

 it("overlays a configured path when an older server does not advertise path probing", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["https://localhost:5173/docs?mode=test#results"],
 configuredUrlProbing: false,
 });

 expect(result[0]?.requestedUrl).toBe("https://localhost:5173/docs?mode=test#results");
 });

 it("does not overlay an unverified configured path when the server probes paths", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["http://localhost:5173/docs"],
 configuredUrlProbing: true,
 });

 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});

describe("PreviewableServer interface", () => {
 it("preserves listening flag through enrichment", () => {
 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 }),
 ],
 configuredUrls: [],
 });
const merged: PreviewableServer | undefined = result[0];
 expect(merged?.listening).toBe(true);
expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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fix(preview): only show browser-ready local servers#6021

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 Merged

maria-rcks
merged 2 commits into

from

Aug 14, 2026
 Merged


fix(preview): only show browser-ready local servers
#6021
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44432e9

fix(preview): only show browser-ready local servers


chrisdeeming Aug 10, 2026
7de1c4e

refactor(preview): drop local server status indicator


chrisdeeming Aug 10, 2026

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557 changes: 532 additions & 25 deletions
apps/server/src/preview/PortScanner.test.ts

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336 changes: 305 additions & 31 deletions
apps/server/src/preview/PortScanner.ts

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22 changes: 15 additions & 7 deletions
apps/server/src/ws.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -2115,23 +2115,31 @@ const makeWsRpcLayer = (
 observeRpcStream(WS_METHODS.subscribePreviewEvents, previewManager.events, {
 "rpc.aggregate": "preview",
 }),
 [WS_METHODS.subscribeDiscoveredLocalServers]: (_input) =>
 [WS_METHODS.subscribeDiscoveredLocalServers]: (input) =>
 observeRpcStream(
 WS_METHODS.subscribeDiscoveredLocalServers,
 Stream.callback<DiscoveredLocalServerList>((queue) =>
 Effect.gen(function* () {
 const configuredUrls = input.configuredUrls ?? [];
 yield* portDiscovery.retain;
 const initial = yield* portDiscovery.scan();
 const initial = yield* portDiscovery.scan(configuredUrls);
 const initialScannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers: initial,
 scannedAt: initialScannedAt,
 configuredUrlProbing: true,
 });
 yield* portDiscovery.subscribe((servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, { servers, scannedAt });
 }),
 yield* portDiscovery.subscribe(
 { configuredUrls, initialSnapshot: initial },
 (servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers,
 scannedAt,
 configuredUrlProbing: true,
 });
 }),
 );
 }),
 ),
Expand Down

2 changes: 0 additions & 2 deletions
apps/web/src/components/preview/PreviewEmptyState.test.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -12,7 +12,6 @@ const mocks = vi.hoisted(() => ({
 pid: number | null;
 terminal: null;
 source: "scanner";
 listening: boolean;
 }>,
}));

Expand All@@ -34,7 +33,6 @@ function server(port: number) {
 pid: 1,
 terminal: null,
 source: "scanner" as const,
 listening: true,
 };
}

Expand Down

9 changes: 3 additions & 6 deletions
apps/web/src/components/preview/PreviewEmptyState.tsx

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -11,7 +11,6 @@ import { useDiscoveredLocalServers } from "./useDiscoveredLocalServers";
interface Props {
 environmentId: EnvironmentId;
 configuredUrls?: ReadonlyArray<string> | undefined;
 recentlySeenUrls?: ReadonlyArray<string> | undefined;
 recentEntries: ReadonlyArray<BrowserHistoryEntry>;
 onRemoveRecent: (url: string) => void;
 onOpenUrl: (url: string) => void;
Expand All@@ -20,15 +19,13 @@ interface Props {
export function PreviewEmptyState({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 recentEntries,
 onRemoveRecent,
 onOpenUrl,
}: Props) {
 const servers = useDiscoveredLocalServers({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 });
 const recents = recentEntries.filter((entry) => URL.canParse(entry.url)).slice(0, 8);

Expand All@@ -40,7 +37,7 @@ export function PreviewEmptyState({
 </EmptyMedia>
 <EmptyTitle>No preview yet</EmptyTitle>
 <EmptyDescription>
 Type a URL above, or run a dev script. Listening localhost ports will show up here
 Type a URL above, or run a dev script. Browser-ready localhost servers will show up here
 automatically.
 </EmptyDescription>
 </Empty>
Expand All@@ -49,7 +46,7 @@ export function PreviewEmptyState({

 return (
 <div className="flex h-full min-h-0 overflow-y-auto px-5 py-8">
 <div className="m-auto flex w-full max-w-xl flex-col gap-6">
 <div className="mx-auto flex w-full max-w-xl flex-col gap-6">
 {recents.length > 0 ? (
 <div className="flex flex-col gap-3">
 <div className="flex items-center gap-2 text-sm text-muted-foreground">
Expand DownExpand Up@@ -84,7 +81,7 @@ export function PreviewEmptyState({
 ))}
 </div>
 <p className="px-1 text-xs text-muted-foreground">
 Select a listening port to open it in this browser tab.
 Select a live local server to open it in this browser tab.
 </p>
 </div>
 ) : null}
Expand Down

23 changes: 1 addition & 22 deletions
apps/web/src/components/preview/PreviewLocalServerCard.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,32 +21,11 @@ export function PreviewLocalServerCard({ server, onOpen }: Props) {
 {server.host}:{server.port}
 </span>
 </div>
 {server.listening ? <PulsingDot /> : <DimDot />}
 </button>
 );
}

function describeServer(server: PreviewableServer): string {
 if (server.processName) return server.processName;
 if (server.listening) return "Listening";
 if (server.source === "configured") return "Configured";
 return "Recently seen";
}

function PulsingDot() {
 return (
 <span aria-label="Listening" className="relative inline-flex size-2 shrink-0">
 <span className="absolute inset-0 animate-status-ping rounded-full bg-success opacity-60" />
 <span className="relative inline-flex size-2 rounded-full bg-success" />
 </span>
 );
}

function DimDot() {
 return (
 <span
 aria-label="Not currently listening"
 className="size-2 shrink-0 rounded-full bg-muted-foreground/40"
 />
 );
 return "Listening";
}

1 change: 0 additions & 1 deletion
apps/web/src/components/preview/PreviewView.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -712,7 +712,6 @@ export function PreviewView({
 <PreviewEmptyState
 environmentId={threadRef.environmentId}
 configuredUrls={configuredUrls}
 recentlySeenUrls={previewState.recentlySeenUrls}
 recentEntries={recentHistoryEntries}
 onRemoveRecent={(url) => removeUrlForThread(threadRef, url)}
 onOpenUrl={(next) => void handleOpenServerUrl(next)}
Expand Down

113 changes: 60 additions & 53 deletions
apps/web/src/components/preview/useDiscoveredLocalServers.test.ts

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Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
import type { DiscoveredLocalServer } from "@t3tools/contracts";
import { describe, expect, it } from "vite-plus/test";

import { mergeServers, type PreviewableServer } from "./useDiscoveredLocalServers";
import { mergeServers } from "./useDiscoveredLocalServers";

const scannerServer = (
 overrides: Partial<DiscoveredLocalServer & { requestedUrl: string }>,
Expand All@@ -21,15 +21,13 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: [],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 host: "localhost",
 port: 5173,
 requestedUrl: "http://localhost:5173",
 source: "scanner",
 listening: true,
 processName: "vite",
 });
 });
Expand All@@ -38,102 +36,111 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173, processName: "node", pid: 9999 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 port: 5173,
 source: "configured",
 listening: true,
 processName: "node",
 pid: 9999,
 });
 });

 it("keeps configured entries that the scanner doesn't see, with listening=false", () => {
 it("excludes configured entries that the live scanner doesn't see", () => {
 const result = mergeServers({
 scanner: [],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 source: "configured",
 listening: false,
 requestedUrl: "http://localhost:5173/",
 });
 });

 it("dedupes recently-seen URLs against scanner+configured entries", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173 })],
 configuredUrls: [],
 recentlySeenUrls: ["http://localhost:5173/", "http://localhost:8080/"],
 });
 expect(result.map((s) => s.port)).toEqual([5173, 8080]);
 expect(result.find((s) => s.port === 5173)?.source).toBe("scanner");
 expect(result.find((s) => s.port === 8080)?.source).toBe("recent");
 expect(result.find((s) => s.port === 8080)?.requestedUrl).toBe("http://localhost:8080/");
 expect(result).toHaveLength(0);
 });

 it("ignores non-loopback URLs in configured/recent inputs", () => {
 it("ignores non-loopback configured URLs", () => {
 const result = mergeServers({
 scanner: [],
 scanner: [scannerServer({})],
 configuredUrls: ["https://example.com", "ws://localhost:5173"],
 recentlySeenUrls: ["https://api.example.com"],
 });
 expect(result).toHaveLength(0);
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("scanner");
 });

 it("sorts: configured before scanner before recent, then by port", () => {
 it("sorts configured live servers before scanner-only servers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 8080 }), scannerServer({ port: 3000 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: ["http://localhost:9000/", "http://localhost:4321/"],
 configuredUrls: ["http://localhost:8080"],
 });
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual([
 "configured:5173",
 "scanner:3000",
 "scanner:8080",
 "recent:4321",
 "recent:9000",
 ]);
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual(["configured:8080", "scanner:3000"]);
 });

 it("dedupes by lowercased host", () => {
 const result = mergeServers({
 scanner: [scannerServer({ host: "Localhost", port: 5173 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 });

 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 it.each(["127.0.0.1", "0.0.0.0", "[::1]"])(
 "matches configured loopback alias %s to a live localhost server",
 (host) => {
 const result = mergeServers({
 scanner: [
 scannerServer({ requestedUrl: `http://localhost:5173/dashboard?mode=test#results` }),
 ],
 configuredUrls: [`http://${host}:5173/dashboard?mode=test#results`],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 },
 );

 it("keeps the scanner-verified path and protocol", () => {
 const result = mergeServers({
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 requestedUrl: "http://localhost:5173/dashboard?mode=test#results",
 }),
 ],
 configuredUrls: [],
 recentlySeenUrls: [],
 configuredUrls: ["https://localhost:5173/dashboard?mode=test#results"],
 });
 expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 });

 it("overlays a configured path when an older server does not advertise path probing", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["https://localhost:5173/docs?mode=test#results"],
 configuredUrlProbing: false,
 });

 expect(result[0]?.requestedUrl).toBe("https://localhost:5173/docs?mode=test#results");
 });

 it("does not overlay an unverified configured path when the server probes paths", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["http://localhost:5173/docs"],
 configuredUrlProbing: true,
 });

 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});

describe("PreviewableServer interface", () => {
 it("preserves listening flag through enrichment", () => {
 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 }),
 ],
 configuredUrls: [],
 });
const merged: PreviewableServer | undefined = result[0];
 expect(merged?.listening).toBe(true);
expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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fix(preview): only show browser-ready local servers#6021

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maria-rcks
merged 2 commits into

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Aug 14, 2026
 Merged


fix(preview): only show browser-ready local servers
#6021
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44432e9

fix(preview): only show browser-ready local servers


chrisdeeming Aug 10, 2026
7de1c4e

refactor(preview): drop local server status indicator


chrisdeeming Aug 10, 2026

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557 changes: 532 additions & 25 deletions
apps/server/src/preview/PortScanner.test.ts

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336 changes: 305 additions & 31 deletions
apps/server/src/preview/PortScanner.ts

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22 changes: 15 additions & 7 deletions
apps/server/src/ws.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -2115,23 +2115,31 @@ const makeWsRpcLayer = (
 observeRpcStream(WS_METHODS.subscribePreviewEvents, previewManager.events, {
 "rpc.aggregate": "preview",
 }),
 [WS_METHODS.subscribeDiscoveredLocalServers]: (_input) =>
 [WS_METHODS.subscribeDiscoveredLocalServers]: (input) =>
 observeRpcStream(
 WS_METHODS.subscribeDiscoveredLocalServers,
 Stream.callback<DiscoveredLocalServerList>((queue) =>
 Effect.gen(function* () {
 const configuredUrls = input.configuredUrls ?? [];
 yield* portDiscovery.retain;
 const initial = yield* portDiscovery.scan();
 const initial = yield* portDiscovery.scan(configuredUrls);
 const initialScannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers: initial,
 scannedAt: initialScannedAt,
 configuredUrlProbing: true,
 });
 yield* portDiscovery.subscribe((servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, { servers, scannedAt });
 }),
 yield* portDiscovery.subscribe(
 { configuredUrls, initialSnapshot: initial },
 (servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers,
 scannedAt,
 configuredUrlProbing: true,
 });
 }),
 );
 }),
 ),
Expand Down

2 changes: 0 additions & 2 deletions
apps/web/src/components/preview/PreviewEmptyState.test.tsx

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -12,7 +12,6 @@ const mocks = vi.hoisted(() => ({
 pid: number | null;
 terminal: null;
 source: "scanner";
 listening: boolean;
 }>,
}));

Expand All@@ -34,7 +33,6 @@ function server(port: number) {
 pid: 1,
 terminal: null,
 source: "scanner" as const,
 listening: true,
 };
}

Expand Down

9 changes: 3 additions & 6 deletions
apps/web/src/components/preview/PreviewEmptyState.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -11,7 +11,6 @@ import { useDiscoveredLocalServers } from "./useDiscoveredLocalServers";
interface Props {
 environmentId: EnvironmentId;
 configuredUrls?: ReadonlyArray<string> | undefined;
 recentlySeenUrls?: ReadonlyArray<string> | undefined;
 recentEntries: ReadonlyArray<BrowserHistoryEntry>;
 onRemoveRecent: (url: string) => void;
 onOpenUrl: (url: string) => void;
Expand All@@ -20,15 +19,13 @@ interface Props {
export function PreviewEmptyState({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 recentEntries,
 onRemoveRecent,
 onOpenUrl,
}: Props) {
 const servers = useDiscoveredLocalServers({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 });
 const recents = recentEntries.filter((entry) => URL.canParse(entry.url)).slice(0, 8);

Expand All@@ -40,7 +37,7 @@ export function PreviewEmptyState({
 </EmptyMedia>
 <EmptyTitle>No preview yet</EmptyTitle>
 <EmptyDescription>
 Type a URL above, or run a dev script. Listening localhost ports will show up here
 Type a URL above, or run a dev script. Browser-ready localhost servers will show up here
 automatically.
 </EmptyDescription>
 </Empty>
Expand All@@ -49,7 +46,7 @@ export function PreviewEmptyState({

 return (
 <div className="flex h-full min-h-0 overflow-y-auto px-5 py-8">
 <div className="m-auto flex w-full max-w-xl flex-col gap-6">
 <div className="mx-auto flex w-full max-w-xl flex-col gap-6">
 {recents.length > 0 ? (
 <div className="flex flex-col gap-3">
 <div className="flex items-center gap-2 text-sm text-muted-foreground">
Expand DownExpand Up@@ -84,7 +81,7 @@ export function PreviewEmptyState({
 ))}
 </div>
 <p className="px-1 text-xs text-muted-foreground">
 Select a listening port to open it in this browser tab.
 Select a live local server to open it in this browser tab.
 </p>
 </div>
 ) : null}
Expand Down

23 changes: 1 addition & 22 deletions
apps/web/src/components/preview/PreviewLocalServerCard.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,32 +21,11 @@ export function PreviewLocalServerCard({ server, onOpen }: Props) {
 {server.host}:{server.port}
 </span>
 </div>
 {server.listening ? <PulsingDot /> : <DimDot />}
 </button>
 );
}

function describeServer(server: PreviewableServer): string {
 if (server.processName) return server.processName;
 if (server.listening) return "Listening";
 if (server.source === "configured") return "Configured";
 return "Recently seen";
}

function PulsingDot() {
 return (
 <span aria-label="Listening" className="relative inline-flex size-2 shrink-0">
 <span className="absolute inset-0 animate-status-ping rounded-full bg-success opacity-60" />
 <span className="relative inline-flex size-2 rounded-full bg-success" />
 </span>
 );
}

function DimDot() {
 return (
 <span
 aria-label="Not currently listening"
 className="size-2 shrink-0 rounded-full bg-muted-foreground/40"
 />
 );
 return "Listening";
}

1 change: 0 additions & 1 deletion
apps/web/src/components/preview/PreviewView.tsx

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -712,7 +712,6 @@ export function PreviewView({
 <PreviewEmptyState
 environmentId={threadRef.environmentId}
 configuredUrls={configuredUrls}
 recentlySeenUrls={previewState.recentlySeenUrls}
 recentEntries={recentHistoryEntries}
 onRemoveRecent={(url) => removeUrlForThread(threadRef, url)}
 onOpenUrl={(next) => void handleOpenServerUrl(next)}
Expand Down

113 changes: 60 additions & 53 deletions
apps/web/src/components/preview/useDiscoveredLocalServers.test.ts

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Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
import type { DiscoveredLocalServer } from "@t3tools/contracts";
import { describe, expect, it } from "vite-plus/test";

import { mergeServers, type PreviewableServer } from "./useDiscoveredLocalServers";
import { mergeServers } from "./useDiscoveredLocalServers";

const scannerServer = (
 overrides: Partial<DiscoveredLocalServer & { requestedUrl: string }>,
Expand All@@ -21,15 +21,13 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: [],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 host: "localhost",
 port: 5173,
 requestedUrl: "http://localhost:5173",
 source: "scanner",
 listening: true,
 processName: "vite",
 });
 });
Expand All@@ -38,102 +36,111 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173, processName: "node", pid: 9999 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 port: 5173,
 source: "configured",
 listening: true,
 processName: "node",
 pid: 9999,
 });
 });

 it("keeps configured entries that the scanner doesn't see, with listening=false", () => {
 it("excludes configured entries that the live scanner doesn't see", () => {
 const result = mergeServers({
 scanner: [],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 source: "configured",
 listening: false,
 requestedUrl: "http://localhost:5173/",
 });
 });

 it("dedupes recently-seen URLs against scanner+configured entries", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173 })],
 configuredUrls: [],
 recentlySeenUrls: ["http://localhost:5173/", "http://localhost:8080/"],
 });
 expect(result.map((s) => s.port)).toEqual([5173, 8080]);
 expect(result.find((s) => s.port === 5173)?.source).toBe("scanner");
 expect(result.find((s) => s.port === 8080)?.source).toBe("recent");
 expect(result.find((s) => s.port === 8080)?.requestedUrl).toBe("http://localhost:8080/");
 expect(result).toHaveLength(0);
 });

 it("ignores non-loopback URLs in configured/recent inputs", () => {
 it("ignores non-loopback configured URLs", () => {
 const result = mergeServers({
 scanner: [],
 scanner: [scannerServer({})],
 configuredUrls: ["https://example.com", "ws://localhost:5173"],
 recentlySeenUrls: ["https://api.example.com"],
 });
 expect(result).toHaveLength(0);
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("scanner");
 });

 it("sorts: configured before scanner before recent, then by port", () => {
 it("sorts configured live servers before scanner-only servers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 8080 }), scannerServer({ port: 3000 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: ["http://localhost:9000/", "http://localhost:4321/"],
 configuredUrls: ["http://localhost:8080"],
 });
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual([
 "configured:5173",
 "scanner:3000",
 "scanner:8080",
 "recent:4321",
 "recent:9000",
 ]);
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual(["configured:8080", "scanner:3000"]);
 });

 it("dedupes by lowercased host", () => {
 const result = mergeServers({
 scanner: [scannerServer({ host: "Localhost", port: 5173 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 });

 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 it.each(["127.0.0.1", "0.0.0.0", "[::1]"])(
 "matches configured loopback alias %s to a live localhost server",
 (host) => {
 const result = mergeServers({
 scanner: [
 scannerServer({ requestedUrl: `http://localhost:5173/dashboard?mode=test#results` }),
 ],
 configuredUrls: [`http://${host}:5173/dashboard?mode=test#results`],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 },
 );

 it("keeps the scanner-verified path and protocol", () => {
 const result = mergeServers({
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 requestedUrl: "http://localhost:5173/dashboard?mode=test#results",
 }),
 ],
 configuredUrls: [],
 recentlySeenUrls: [],
 configuredUrls: ["https://localhost:5173/dashboard?mode=test#results"],
 });
 expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 });

 it("overlays a configured path when an older server does not advertise path probing", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["https://localhost:5173/docs?mode=test#results"],
 configuredUrlProbing: false,
 });

 expect(result[0]?.requestedUrl).toBe("https://localhost:5173/docs?mode=test#results");
 });

 it("does not overlay an unverified configured path when the server probes paths", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["http://localhost:5173/docs"],
 configuredUrlProbing: true,
 });

 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});

describe("PreviewableServer interface", () => {
 it("preserves listening flag through enrichment", () => {
 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 }),
 ],
 configuredUrls: [],
 });
const merged: PreviewableServer | undefined = result[0];
 expect(merged?.listening).toBe(true);
expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
fix(preview): only show browser-ready local servers#6021

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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to your account

 Merged

maria-rcks
merged 2 commits into

from

Aug 14, 2026
 Merged


fix(preview): only show browser-ready local servers
#6021
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44432e9

fix(preview): only show browser-ready local servers


chrisdeeming Aug 10, 2026
7de1c4e

refactor(preview): drop local server status indicator


chrisdeeming Aug 10, 2026

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557 changes: 532 additions & 25 deletions
apps/server/src/preview/PortScanner.test.ts

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Large diffs are not rendered by default.


336 changes: 305 additions & 31 deletions
apps/server/src/preview/PortScanner.ts

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22 changes: 15 additions & 7 deletions
apps/server/src/ws.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -2115,23 +2115,31 @@ const makeWsRpcLayer = (
 observeRpcStream(WS_METHODS.subscribePreviewEvents, previewManager.events, {
 "rpc.aggregate": "preview",
 }),
 [WS_METHODS.subscribeDiscoveredLocalServers]: (_input) =>
 [WS_METHODS.subscribeDiscoveredLocalServers]: (input) =>
 observeRpcStream(
 WS_METHODS.subscribeDiscoveredLocalServers,
 Stream.callback<DiscoveredLocalServerList>((queue) =>
 Effect.gen(function* () {
 const configuredUrls = input.configuredUrls ?? [];
 yield* portDiscovery.retain;
 const initial = yield* portDiscovery.scan();
 const initial = yield* portDiscovery.scan(configuredUrls);
 const initialScannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers: initial,
 scannedAt: initialScannedAt,
 configuredUrlProbing: true,
 });
 yield* portDiscovery.subscribe((servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, { servers, scannedAt });
 }),
 yield* portDiscovery.subscribe(
 { configuredUrls, initialSnapshot: initial },
 (servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers,
 scannedAt,
 configuredUrlProbing: true,
 });
 }),
 );
 }),
 ),
Expand Down

2 changes: 0 additions & 2 deletions
apps/web/src/components/preview/PreviewEmptyState.test.tsx

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -12,7 +12,6 @@ const mocks = vi.hoisted(() => ({
 pid: number | null;
 terminal: null;
 source: "scanner";
 listening: boolean;
 }>,
}));

Expand All@@ -34,7 +33,6 @@ function server(port: number) {
 pid: 1,
 terminal: null,
 source: "scanner" as const,
 listening: true,
 };
}

Expand Down

9 changes: 3 additions & 6 deletions
apps/web/src/components/preview/PreviewEmptyState.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -11,7 +11,6 @@ import { useDiscoveredLocalServers } from "./useDiscoveredLocalServers";
interface Props {
 environmentId: EnvironmentId;
 configuredUrls?: ReadonlyArray<string> | undefined;
 recentlySeenUrls?: ReadonlyArray<string> | undefined;
 recentEntries: ReadonlyArray<BrowserHistoryEntry>;
 onRemoveRecent: (url: string) => void;
 onOpenUrl: (url: string) => void;
Expand All@@ -20,15 +19,13 @@ interface Props {
export function PreviewEmptyState({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 recentEntries,
 onRemoveRecent,
 onOpenUrl,
}: Props) {
 const servers = useDiscoveredLocalServers({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 });
 const recents = recentEntries.filter((entry) => URL.canParse(entry.url)).slice(0, 8);

Expand All@@ -40,7 +37,7 @@ export function PreviewEmptyState({
 </EmptyMedia>
 <EmptyTitle>No preview yet</EmptyTitle>
 <EmptyDescription>
 Type a URL above, or run a dev script. Listening localhost ports will show up here
 Type a URL above, or run a dev script. Browser-ready localhost servers will show up here
 automatically.
 </EmptyDescription>
 </Empty>
Expand All@@ -49,7 +46,7 @@ export function PreviewEmptyState({

 return (
 <div className="flex h-full min-h-0 overflow-y-auto px-5 py-8">
 <div className="m-auto flex w-full max-w-xl flex-col gap-6">
 <div className="mx-auto flex w-full max-w-xl flex-col gap-6">
 {recents.length > 0 ? (
 <div className="flex flex-col gap-3">
 <div className="flex items-center gap-2 text-sm text-muted-foreground">
Expand DownExpand Up@@ -84,7 +81,7 @@ export function PreviewEmptyState({
 ))}
 </div>
 <p className="px-1 text-xs text-muted-foreground">
 Select a listening port to open it in this browser tab.
 Select a live local server to open it in this browser tab.
 </p>
 </div>
 ) : null}
Expand Down

23 changes: 1 addition & 22 deletions
apps/web/src/components/preview/PreviewLocalServerCard.tsx

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -21,32 +21,11 @@ export function PreviewLocalServerCard({ server, onOpen }: Props) {
 {server.host}:{server.port}
 </span>
 </div>
 {server.listening ? <PulsingDot /> : <DimDot />}
 </button>
 );
}

function describeServer(server: PreviewableServer): string {
 if (server.processName) return server.processName;
 if (server.listening) return "Listening";
 if (server.source === "configured") return "Configured";
 return "Recently seen";
}

function PulsingDot() {
 return (
 <span aria-label="Listening" className="relative inline-flex size-2 shrink-0">
 <span className="absolute inset-0 animate-status-ping rounded-full bg-success opacity-60" />
 <span className="relative inline-flex size-2 rounded-full bg-success" />
 </span>
 );
}

function DimDot() {
 return (
 <span
 aria-label="Not currently listening"
 className="size-2 shrink-0 rounded-full bg-muted-foreground/40"
 />
 );
 return "Listening";
}

1 change: 0 additions & 1 deletion
apps/web/src/components/preview/PreviewView.tsx

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -712,7 +712,6 @@ export function PreviewView({
 <PreviewEmptyState
 environmentId={threadRef.environmentId}
 configuredUrls={configuredUrls}
 recentlySeenUrls={previewState.recentlySeenUrls}
 recentEntries={recentHistoryEntries}
 onRemoveRecent={(url) => removeUrlForThread(threadRef, url)}
 onOpenUrl={(next) => void handleOpenServerUrl(next)}
Expand Down

113 changes: 60 additions & 53 deletions
apps/web/src/components/preview/useDiscoveredLocalServers.test.ts

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Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
import type { DiscoveredLocalServer } from "@t3tools/contracts";
import { describe, expect, it } from "vite-plus/test";

import { mergeServers, type PreviewableServer } from "./useDiscoveredLocalServers";
import { mergeServers } from "./useDiscoveredLocalServers";

const scannerServer = (
 overrides: Partial<DiscoveredLocalServer & { requestedUrl: string }>,
Expand All@@ -21,15 +21,13 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: [],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 host: "localhost",
 port: 5173,
 requestedUrl: "http://localhost:5173",
 source: "scanner",
 listening: true,
 processName: "vite",
 });
 });
Expand All@@ -38,102 +36,111 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173, processName: "node", pid: 9999 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 port: 5173,
 source: "configured",
 listening: true,
 processName: "node",
 pid: 9999,
 });
 });

 it("keeps configured entries that the scanner doesn't see, with listening=false", () => {
 it("excludes configured entries that the live scanner doesn't see", () => {
 const result = mergeServers({
 scanner: [],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 source: "configured",
 listening: false,
 requestedUrl: "http://localhost:5173/",
 });
 });

 it("dedupes recently-seen URLs against scanner+configured entries", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173 })],
 configuredUrls: [],
 recentlySeenUrls: ["http://localhost:5173/", "http://localhost:8080/"],
 });
 expect(result.map((s) => s.port)).toEqual([5173, 8080]);
 expect(result.find((s) => s.port === 5173)?.source).toBe("scanner");
 expect(result.find((s) => s.port === 8080)?.source).toBe("recent");
 expect(result.find((s) => s.port === 8080)?.requestedUrl).toBe("http://localhost:8080/");
 expect(result).toHaveLength(0);
 });

 it("ignores non-loopback URLs in configured/recent inputs", () => {
 it("ignores non-loopback configured URLs", () => {
 const result = mergeServers({
 scanner: [],
 scanner: [scannerServer({})],
 configuredUrls: ["https://example.com", "ws://localhost:5173"],
 recentlySeenUrls: ["https://api.example.com"],
 });
 expect(result).toHaveLength(0);
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("scanner");
 });

 it("sorts: configured before scanner before recent, then by port", () => {
 it("sorts configured live servers before scanner-only servers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 8080 }), scannerServer({ port: 3000 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: ["http://localhost:9000/", "http://localhost:4321/"],
 configuredUrls: ["http://localhost:8080"],
 });
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual([
 "configured:5173",
 "scanner:3000",
 "scanner:8080",
 "recent:4321",
 "recent:9000",
 ]);
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual(["configured:8080", "scanner:3000"]);
 });

 it("dedupes by lowercased host", () => {
 const result = mergeServers({
 scanner: [scannerServer({ host: "Localhost", port: 5173 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 });

 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 it.each(["127.0.0.1", "0.0.0.0", "[::1]"])(
 "matches configured loopback alias %s to a live localhost server",
 (host) => {
 const result = mergeServers({
 scanner: [
 scannerServer({ requestedUrl: `http://localhost:5173/dashboard?mode=test#results` }),
 ],
 configuredUrls: [`http://${host}:5173/dashboard?mode=test#results`],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 },
 );

 it("keeps the scanner-verified path and protocol", () => {
 const result = mergeServers({
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 requestedUrl: "http://localhost:5173/dashboard?mode=test#results",
 }),
 ],
 configuredUrls: [],
 recentlySeenUrls: [],
 configuredUrls: ["https://localhost:5173/dashboard?mode=test#results"],
 });
 expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 });

 it("overlays a configured path when an older server does not advertise path probing", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["https://localhost:5173/docs?mode=test#results"],
 configuredUrlProbing: false,
 });

 expect(result[0]?.requestedUrl).toBe("https://localhost:5173/docs?mode=test#results");
 });

 it("does not overlay an unverified configured path when the server probes paths", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["http://localhost:5173/docs"],
 configuredUrlProbing: true,
 });

 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});

describe("PreviewableServer interface", () => {
 it("preserves listening flag through enrichment", () => {
 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 }),
 ],
 configuredUrls: [],
 });
const merged: PreviewableServer | undefined = result[0];
 expect(merged?.listening).toBe(true);
expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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fix(preview): only show browser-ready local servers#6021

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 Merged

maria-rcks
merged 2 commits into

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Aug 14, 2026
 Merged


fix(preview): only show browser-ready local servers
#6021
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44432e9

fix(preview): only show browser-ready local servers


chrisdeeming Aug 10, 2026
7de1c4e

refactor(preview): drop local server status indicator


chrisdeeming Aug 10, 2026

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557 changes: 532 additions & 25 deletions
apps/server/src/preview/PortScanner.test.ts

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336 changes: 305 additions & 31 deletions
apps/server/src/preview/PortScanner.ts

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22 changes: 15 additions & 7 deletions
apps/server/src/ws.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -2115,23 +2115,31 @@ const makeWsRpcLayer = (
 observeRpcStream(WS_METHODS.subscribePreviewEvents, previewManager.events, {
 "rpc.aggregate": "preview",
 }),
 [WS_METHODS.subscribeDiscoveredLocalServers]: (_input) =>
 [WS_METHODS.subscribeDiscoveredLocalServers]: (input) =>
 observeRpcStream(
 WS_METHODS.subscribeDiscoveredLocalServers,
 Stream.callback<DiscoveredLocalServerList>((queue) =>
 Effect.gen(function* () {
 const configuredUrls = input.configuredUrls ?? [];
 yield* portDiscovery.retain;
 const initial = yield* portDiscovery.scan();
 const initial = yield* portDiscovery.scan(configuredUrls);
 const initialScannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers: initial,
 scannedAt: initialScannedAt,
 configuredUrlProbing: true,
 });
 yield* portDiscovery.subscribe((servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, { servers, scannedAt });
 }),
 yield* portDiscovery.subscribe(
 { configuredUrls, initialSnapshot: initial },
 (servers) =>
 Effect.gen(function* () {
 const scannedAt = DateTime.formatIso(yield* DateTime.now);
 yield* Queue.offer(queue, {
 servers,
 scannedAt,
 configuredUrlProbing: true,
 });
 }),
 );
 }),
 ),
Expand Down

2 changes: 0 additions & 2 deletions
apps/web/src/components/preview/PreviewEmptyState.test.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -12,7 +12,6 @@ const mocks = vi.hoisted(() => ({
 pid: number | null;
 terminal: null;
 source: "scanner";
 listening: boolean;
 }>,
}));

Expand All@@ -34,7 +33,6 @@ function server(port: number) {
 pid: 1,
 terminal: null,
 source: "scanner" as const,
 listening: true,
 };
}

Expand Down

9 changes: 3 additions & 6 deletions
apps/web/src/components/preview/PreviewEmptyState.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -11,7 +11,6 @@ import { useDiscoveredLocalServers } from "./useDiscoveredLocalServers";
interface Props {
 environmentId: EnvironmentId;
 configuredUrls?: ReadonlyArray<string> | undefined;
 recentlySeenUrls?: ReadonlyArray<string> | undefined;
 recentEntries: ReadonlyArray<BrowserHistoryEntry>;
 onRemoveRecent: (url: string) => void;
 onOpenUrl: (url: string) => void;
Expand All@@ -20,15 +19,13 @@ interface Props {
export function PreviewEmptyState({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 recentEntries,
 onRemoveRecent,
 onOpenUrl,
}: Props) {
 const servers = useDiscoveredLocalServers({
 environmentId,
 configuredUrls,
 recentlySeenUrls,
 });
 const recents = recentEntries.filter((entry) => URL.canParse(entry.url)).slice(0, 8);

Expand All@@ -40,7 +37,7 @@ export function PreviewEmptyState({
 </EmptyMedia>
 <EmptyTitle>No preview yet</EmptyTitle>
 <EmptyDescription>
 Type a URL above, or run a dev script. Listening localhost ports will show up here
 Type a URL above, or run a dev script. Browser-ready localhost servers will show up here
 automatically.
 </EmptyDescription>
 </Empty>
Expand All@@ -49,7 +46,7 @@ export function PreviewEmptyState({

 return (
 <div className="flex h-full min-h-0 overflow-y-auto px-5 py-8">
 <div className="m-auto flex w-full max-w-xl flex-col gap-6">
 <div className="mx-auto flex w-full max-w-xl flex-col gap-6">
 {recents.length > 0 ? (
 <div className="flex flex-col gap-3">
 <div className="flex items-center gap-2 text-sm text-muted-foreground">
Expand DownExpand Up@@ -84,7 +81,7 @@ export function PreviewEmptyState({
 ))}
 </div>
 <p className="px-1 text-xs text-muted-foreground">
 Select a listening port to open it in this browser tab.
 Select a live local server to open it in this browser tab.
 </p>
 </div>
 ) : null}
Expand Down

23 changes: 1 addition & 22 deletions
apps/web/src/components/preview/PreviewLocalServerCard.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,32 +21,11 @@ export function PreviewLocalServerCard({ server, onOpen }: Props) {
 {server.host}:{server.port}
 </span>
 </div>
 {server.listening ? <PulsingDot /> : <DimDot />}
 </button>
 );
}

function describeServer(server: PreviewableServer): string {
 if (server.processName) return server.processName;
 if (server.listening) return "Listening";
 if (server.source === "configured") return "Configured";
 return "Recently seen";
}

function PulsingDot() {
 return (
 <span aria-label="Listening" className="relative inline-flex size-2 shrink-0">
 <span className="absolute inset-0 animate-status-ping rounded-full bg-success opacity-60" />
 <span className="relative inline-flex size-2 rounded-full bg-success" />
 </span>
 );
}

function DimDot() {
 return (
 <span
 aria-label="Not currently listening"
 className="size-2 shrink-0 rounded-full bg-muted-foreground/40"
 />
 );
 return "Listening";
}

1 change: 0 additions & 1 deletion
apps/web/src/components/preview/PreviewView.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -712,7 +712,6 @@ export function PreviewView({
 <PreviewEmptyState
 environmentId={threadRef.environmentId}
 configuredUrls={configuredUrls}
 recentlySeenUrls={previewState.recentlySeenUrls}
 recentEntries={recentHistoryEntries}
 onRemoveRecent={(url) => removeUrlForThread(threadRef, url)}
 onOpenUrl={(next) => void handleOpenServerUrl(next)}
Expand Down

113 changes: 60 additions & 53 deletions
apps/web/src/components/preview/useDiscoveredLocalServers.test.ts

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Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
import type { DiscoveredLocalServer } from "@t3tools/contracts";
import { describe, expect, it } from "vite-plus/test";

import { mergeServers, type PreviewableServer } from "./useDiscoveredLocalServers";
import { mergeServers } from "./useDiscoveredLocalServers";

const scannerServer = (
 overrides: Partial<DiscoveredLocalServer & { requestedUrl: string }>,
Expand All@@ -21,15 +21,13 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: [],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 host: "localhost",
 port: 5173,
 requestedUrl: "http://localhost:5173",
 source: "scanner",
 listening: true,
 processName: "vite",
 });
 });
Expand All@@ -38,102 +36,111 @@ describe("mergeServers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173, processName: "node", pid: 9999 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 port: 5173,
 source: "configured",
 listening: true,
 processName: "node",
 pid: 9999,
 });
 });

 it("keeps configured entries that the scanner doesn't see, with listening=false", () => {
 it("excludes configured entries that the live scanner doesn't see", () => {
 const result = mergeServers({
 scanner: [],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]).toMatchObject({
 source: "configured",
 listening: false,
 requestedUrl: "http://localhost:5173/",
 });
 });

 it("dedupes recently-seen URLs against scanner+configured entries", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 5173 })],
 configuredUrls: [],
 recentlySeenUrls: ["http://localhost:5173/", "http://localhost:8080/"],
 });
 expect(result.map((s) => s.port)).toEqual([5173, 8080]);
 expect(result.find((s) => s.port === 5173)?.source).toBe("scanner");
 expect(result.find((s) => s.port === 8080)?.source).toBe("recent");
 expect(result.find((s) => s.port === 8080)?.requestedUrl).toBe("http://localhost:8080/");
 expect(result).toHaveLength(0);
 });

 it("ignores non-loopback URLs in configured/recent inputs", () => {
 it("ignores non-loopback configured URLs", () => {
 const result = mergeServers({
 scanner: [],
 scanner: [scannerServer({})],
 configuredUrls: ["https://example.com", "ws://localhost:5173"],
 recentlySeenUrls: ["https://api.example.com"],
 });
 expect(result).toHaveLength(0);
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("scanner");
 });

 it("sorts: configured before scanner before recent, then by port", () => {
 it("sorts configured live servers before scanner-only servers", () => {
 const result = mergeServers({
 scanner: [scannerServer({ port: 8080 }), scannerServer({ port: 3000 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: ["http://localhost:9000/", "http://localhost:4321/"],
 configuredUrls: ["http://localhost:8080"],
 });
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual([
 "configured:5173",
 "scanner:3000",
 "scanner:8080",
 "recent:4321",
 "recent:9000",
 ]);
 expect(result.map((s) => `${s.source}:${s.port}`)).toEqual(["configured:8080", "scanner:3000"]);
 });

 it("dedupes by lowercased host", () => {
 const result = mergeServers({
 scanner: [scannerServer({ host: "Localhost", port: 5173 })],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 });

 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 it.each(["127.0.0.1", "0.0.0.0", "[::1]"])(
 "matches configured loopback alias %s to a live localhost server",
 (host) => {
 const result = mergeServers({
 scanner: [
 scannerServer({ requestedUrl: `http://localhost:5173/dashboard?mode=test#results` }),
 ],
 configuredUrls: [`http://${host}:5173/dashboard?mode=test#results`],
 });
 expect(result).toHaveLength(1);
 expect(result[0]?.source).toBe("configured");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 },
 );

 it("keeps the scanner-verified path and protocol", () => {
 const result = mergeServers({
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 requestedUrl: "http://localhost:5173/dashboard?mode=test#results",
 }),
 ],
 configuredUrls: [],
 recentlySeenUrls: [],
 configuredUrls: ["https://localhost:5173/dashboard?mode=test#results"],
 });
 expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/dashboard?mode=test#results");
 });

 it("overlays a configured path when an older server does not advertise path probing", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["https://localhost:5173/docs?mode=test#results"],
 configuredUrlProbing: false,
 });

 expect(result[0]?.requestedUrl).toBe("https://localhost:5173/docs?mode=test#results");
 });

 it("does not overlay an unverified configured path when the server probes paths", () => {
 const result = mergeServers({
 scanner: [scannerServer({ requestedUrl: "http://localhost:5173/" })],
 configuredUrls: ["http://localhost:5173/docs"],
 configuredUrlProbing: true,
 });

 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});

describe("PreviewableServer interface", () => {
 it("preserves listening flag through enrichment", () => {
 it("keeps a scanner entry's pre-resolution requestedUrl distinct from a resolved url", () => {
 const result = mergeServers({
 scanner: [scannerServer({})],
 configuredUrls: ["http://localhost:5173"],
 recentlySeenUrls: [],
 scanner: [
 scannerServer({
 port: 5173,
 url: "https://env-42.example.dev:5173/",
 requestedUrl: "http://localhost:5173/",
 }),
 ],
 configuredUrls: [],
 });
const merged: PreviewableServer | undefined = result[0];
 expect(merged?.listening).toBe(true);
expect(result[0]?.url).toBe("https://env-42.example.dev:5173/");
 expect(result[0]?.requestedUrl).toBe("http://localhost:5173/");
 });
});
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