fix(sveltekit): Detect used adapter via svelte.config.js - #19270

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fix(sveltekit): Detect used adapter via svelte.config.js#19270
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This PR improves the Sveltekit adapter detection logic by loading svelte.config.js and attempting to look up the adapter name via the config. In case we cannot load the config, we still fall back to package.json-based lookups.

The name property is a required property for Kit adapters since SvelteKit 2 (see here), so in theory all adapters should include it. For the ones we support directly, I double-checked this.

This should fix cases like #19173 where adapters are used conditionally and multiple adapter packages are installed. I opted against checking platform environment variables (as discussed in the issue) because this would only work on the respective platforms and still leave a significant portion of detection attempts incorrect/sub-optimal. Going directly to the config object (i.e. the source of truth) should in theory fix all of these issues.

closes#19173

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Comment threadpackages/sveltekit/src/vite/detectAdapter.ts
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {

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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters

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not supported at the moment, so I'd rather avoid it (for now)

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Nice approach with the name property, much better.

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Lms24 merged commit 24b2ef2 into developFeb 11, 2026
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Sveltekit plugin unexpected adapter detection causes sourcemaps to not be built

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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(sveltekit): Detect used adapter via svelte.config.js - #19270
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lms/fix-sveltekit-adapter-detection
Feb 11, 2026
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fix(sveltekit): Detect used adapter via svelte.config.js#19270
Lms24 merged 4 commits into
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This PR improves the Sveltekit adapter detection logic by loading svelte.config.js and attempting to look up the adapter name via the config. In case we cannot load the config, we still fall back to package.json-based lookups.
The name property is a required property for Kit adapters since SvelteKit 2 (see here), so in theory all adapters should include it. For the ones we support directly, I double-checked this.
This should fix cases like #19173 where adapters are used conditionally and multiple adapter packages are installed. I opted against checking platform environment variables (as discussed in the issue) because this would only work on the respective platforms and still leave a significant portion of detection attempts incorrect/sub-optimal. Going directly to the config object (i.e. the source of truth) should in theory fix all of these issues.
closes#19173
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Comment threadpackages/sveltekit/src/vite/detectAdapter.ts
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
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not supported at the moment, so I'd rather avoid it (for now)
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Nice approach with the name property, much better.
@Lms24
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merged commit 24b2ef2
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Sveltekit plugin unexpected adapter detection causes sourcemaps to not be built


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, '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('^' + ".*" + '

Skip to content
fix(sveltekit): Detect used adapter via svelte.config.js - #19270
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Lms24 merged 4 commits into
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lms/fix-sveltekit-adapter-detection
Feb 11, 2026
Merged
fix(sveltekit): Detect used adapter via svelte.config.js#19270
Lms24 merged 4 commits into
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This PR improves the Sveltekit adapter detection logic by loading svelte.config.js and attempting to look up the adapter name via the config. In case we cannot load the config, we still fall back to package.json-based lookups.
The name property is a required property for Kit adapters since SvelteKit 2 (see here), so in theory all adapters should include it. For the ones we support directly, I double-checked this.
This should fix cases like #19173 where adapters are used conditionally and multiple adapter packages are installed. I opted against checking platform environment variables (as discussed in the issue) because this would only work on the respective platforms and still leave a significant portion of detection attempts incorrect/sub-optimal. Going directly to the config object (i.e. the source of truth) should in theory fix all of these issues.
closes#19173
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Comment threadpackages/sveltekit/src/vite/detectAdapter.ts
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
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not supported at the moment, so I'd rather avoid it (for now)
andreiborza
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Nice approach with the name property, much better.
@Lms24
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merged commit 24b2ef2
into
developFeb 11, 2026

42 checks passed

@Lms24
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lms/fix-sveltekit-adapter-detection

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February 11, 2026 10:43
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Sveltekit plugin unexpected adapter detection causes sourcemaps to not be built


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, '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('^' + ".*" + '

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fix(sveltekit): Detect used adapter via svelte.config.js - #19270
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lms/fix-sveltekit-adapter-detection
Feb 11, 2026
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fix(sveltekit): Detect used adapter via svelte.config.js#19270
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This PR improves the Sveltekit adapter detection logic by loading svelte.config.js and attempting to look up the adapter name via the config. In case we cannot load the config, we still fall back to package.json-based lookups.
The name property is a required property for Kit adapters since SvelteKit 2 (see here), so in theory all adapters should include it. For the ones we support directly, I double-checked this.
This should fix cases like #19173 where adapters are used conditionally and multiple adapter packages are installed. I opted against checking platform environment variables (as discussed in the issue) because this would only work on the respective platforms and still leave a significant portion of detection attempts incorrect/sub-optimal. Going directly to the config object (i.e. the source of truth) should in theory fix all of these issues.
closes#19173
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Comment threadpackages/sveltekit/src/vite/detectAdapter.ts
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
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not supported at the moment, so I'd rather avoid it (for now)
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Nice approach with the name property, much better.
@Lms24
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merged commit 24b2ef2
into
developFeb 11, 2026

42 checks passed

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lms/fix-sveltekit-adapter-detection

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Sveltekit plugin unexpected adapter detection causes sourcemaps to not be built


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, '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(sveltekit): Detect used adapter via svelte.config.js - #19270
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Feb 11, 2026
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fix(sveltekit): Detect used adapter via svelte.config.js#19270
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This PR improves the Sveltekit adapter detection logic by loading svelte.config.js and attempting to look up the adapter name via the config. In case we cannot load the config, we still fall back to package.json-based lookups.
The name property is a required property for Kit adapters since SvelteKit 2 (see here), so in theory all adapters should include it. For the ones we support directly, I double-checked this.
This should fix cases like #19173 where adapters are used conditionally and multiple adapter packages are installed. I opted against checking platform environment variables (as discussed in the issue) because this would only work on the respective platforms and still leave a significant portion of detection attempts incorrect/sub-optimal. Going directly to the config object (i.e. the source of truth) should in theory fix all of these issues.
closes#19173
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Comment threadpackages/sveltekit/src/vite/detectAdapter.ts
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
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not supported at the moment, so I'd rather avoid it (for now)
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Nice approach with the name property, much better.
@Lms24
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merged commit 24b2ef2
into
developFeb 11, 2026

42 checks passed

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Sveltekit plugin unexpected adapter detection causes sourcemaps to not be built


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, '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('^' + ".*" + '

Skip to content
fix(sveltekit): Detect used adapter via svelte.config.js - #19270
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lms/fix-sveltekit-adapter-detection
Feb 11, 2026
Merged
fix(sveltekit): Detect used adapter via svelte.config.js#19270
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This PR improves the Sveltekit adapter detection logic by loading svelte.config.js and attempting to look up the adapter name via the config. In case we cannot load the config, we still fall back to package.json-based lookups.
The name property is a required property for Kit adapters since SvelteKit 2 (see here), so in theory all adapters should include it. For the ones we support directly, I double-checked this.
This should fix cases like #19173 where adapters are used conditionally and multiple adapter packages are installed. I opted against checking platform environment variables (as discussed in the issue) because this would only work on the respective platforms and still leave a significant portion of detection attempts incorrect/sub-optimal. Going directly to the config object (i.e. the source of truth) should in theory fix all of these issues.
closes#19173
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Comment threadpackages/sveltekit/src/vite/detectAdapter.ts
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
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not supported at the moment, so I'd rather avoid it (for now)
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Nice approach with the name property, much better.
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Sveltekit plugin unexpected adapter detection causes sourcemaps to not be built


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, '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('^' + ".*" + '

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fix(sveltekit): Detect used adapter via svelte.config.js - #19270
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lms/fix-sveltekit-adapter-detection
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fix(sveltekit): Detect used adapter via svelte.config.js#19270
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This PR improves the Sveltekit adapter detection logic by loading svelte.config.js and attempting to look up the adapter name via the config. In case we cannot load the config, we still fall back to package.json-based lookups.
The name property is a required property for Kit adapters since SvelteKit 2 (see here), so in theory all adapters should include it. For the ones we support directly, I double-checked this.
This should fix cases like #19173 where adapters are used conditionally and multiple adapter packages are installed. I opted against checking platform environment variables (as discussed in the issue) because this would only work on the respective platforms and still leave a significant portion of detection attempts incorrect/sub-optimal. Going directly to the config object (i.e. the source of truth) should in theory fix all of these issues.
closes#19173
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Comment threadpackages/sveltekit/src/vite/detectAdapter.ts
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
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not supported at the moment, so I'd rather avoid it (for now)
andreiborza
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Nice approach with the name property, much better.
@Lms24
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merged commit 24b2ef2
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developFeb 11, 2026

42 checks passed

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lms/fix-sveltekit-adapter-detection

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Sveltekit plugin unexpected adapter detection causes sourcemaps to not be built


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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); }
})();
})();

Skip to content
fix(sveltekit): Detect used adapter via svelte.config.js - #19270
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Lms24 merged 4 commits into
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lms/fix-sveltekit-adapter-detection
Feb 11, 2026
Merged
fix(sveltekit): Detect used adapter via svelte.config.js#19270
Lms24 merged 4 commits into
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This PR improves the Sveltekit adapter detection logic by loading svelte.config.js and attempting to look up the adapter name via the config. In case we cannot load the config, we still fall back to package.json-based lookups.
The name property is a required property for Kit adapters since SvelteKit 2 (see here), so in theory all adapters should include it. For the ones we support directly, I double-checked this.
This should fix cases like #19173 where adapters are used conditionally and multiple adapter packages are installed. I opted against checking platform environment variables (as discussed in the issue) because this would only work on the respective platforms and still leave a significant portion of detection attempts incorrect/sub-optimal. Going directly to the config object (i.e. the source of truth) should in theory fix all of these issues.
closes#19173
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Comment threadpackages/sveltekit/src/vite/detectAdapter.ts
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
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not supported at the moment, so I'd rather avoid it (for now)
andreiborza
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Feb 11, 2026
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Nice approach with the name property, much better.
@Lms24
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merged commit 24b2ef2
into
developFeb 11, 2026

42 checks passed

@Lms24
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lms/fix-sveltekit-adapter-detection

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February 11, 2026 10:43
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Sveltekit plugin unexpected adapter detection causes sourcemaps to not be built


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