Expose source map path/dir to rewriteSources hook #20028

Closed
#20142
Closed
Expose source map path/dir to rewriteSources hook#20028
#20142
Assignees
chargome
Labels
FeatureSvelteKit

Description

@ktarmyshov
ktarmyshov
opened on Mar 27, 2026

Problem Statement

Dear Sentry Team,

I am integrating @sentry/sveltekit with a custom SvelteKit adapter for Azure Static Web Apps.

I was able to make the sourcemap flow work, but I ran into a limitation in the rewriteSources hook API.

Context:

  • My adapter is not one of the built-in adapter targets, so I use:
    sentrySvelteKit({ adapter: 'other', ... })
  • To keep sourcemaps correct in the final adapter output, I re-bundle / re-emit .svelte-kit/output/server and .svelte-kit/output/client into the adapter output directories instead of raw-copying them.
  • My demo/test app lives in ./tests/demo, so source paths need additional rewriting in a monorepo-style layout.
  • I currently solve this with:
    unstable_sentryVitePluginOptions.sourcemaps.rewriteSources

The problem:
today the hook only receives (source, map), but in my case I also need to know where the current source map file is located.

Something like this would be very helpful:

type RewriteSourcesHook = (source: string, map: any, mapPath: string) => string;

or at least:

type RewriteSourcesHook = (source: string, map: any, mapDir: string) => string;

Why this would help:
in order to rewrite relative source paths correctly, I need to resolve them relative to the source map location, not just relative to process.cwd().

Conceptually I need to do something like:

resolve(mapDir, source)

At the moment, because the hook does not provide the map location, I have to:

  1. scan directories,
  2. read .map files,
  3. find which map contains the given source entry,
  4. reconstruct the directory of that map,
  5. only then rewrite the source path.

So most of my implementation is just working around the missing mapDir / mapPath context.

Providing either mapDir or mapPath to the hook would remove most of that complexity and make rewriteSources much easier to use for custom adapters and monorepo-like layouts.

My current implementation is here for reference:
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js

Would you consider exposing the source map directory or path to rewriteSources?

Thank you!
Konstantin

Solution Brainstorm

https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/2d0da5a00063f5d2758837a3b7648671bd11e33b/tests/demo/vite.config.ts#L28

Additional Context

No response

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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" + '

Skip to content
Expose source map path/dir to rewriteSources hook #20028
Closed
#20142
Closed
Expose source map path/dir to rewriteSources hook#20028
#20142
Assignees
chargome
Labels
FeatureSvelteKit
Description
@ktarmyshov
ktarmyshov
opened on Mar 27, 2026
Problem Statement
Dear Sentry Team,
I am integrating @sentry/sveltekit with a custom SvelteKit adapter for Azure Static Web Apps.
I was able to make the sourcemap flow work, but I ran into a limitation in the rewriteSources hook API.
Context:
  • My adapter is not one of the built-in adapter targets, so I use:
    sentrySvelteKit({ adapter: 'other', ... })
  • To keep sourcemaps correct in the final adapter output, I re-bundle / re-emit .svelte-kit/output/server and .svelte-kit/output/client into the adapter output directories instead of raw-copying them.
  • My demo/test app lives in ./tests/demo, so source paths need additional rewriting in a monorepo-style layout.
  • I currently solve this with:
    unstable_sentryVitePluginOptions.sourcemaps.rewriteSources
The problem:

today the hook only receives (source, map), but in my case I also need to know where the current source map file is located.
Something like this would be very helpful:
type RewriteSourcesHook = (source: string, map: any, mapPath: string) => string;
or at least:
type RewriteSourcesHook = (source: string, map: any, mapDir: string) => string;
Why this would help:

in order to rewrite relative source paths correctly, I need to resolve them relative to the source map location, not just relative to process.cwd().
Conceptually I need to do something like:
resolve(mapDir, source)
At the moment, because the hook does not provide the map location, I have to:
  1. scan directories,
  2. read .map files,
  3. find which map contains the given source entry,
  4. reconstruct the directory of that map,
  5. only then rewrite the source path.
So most of my implementation is just working around the missing mapDir / mapPath context.
Providing either mapDir or mapPath to the hook would remove most of that complexity and make rewriteSources much easier to use for custom adapters and monorepo-like layouts.
My current implementation is here for reference:
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
Would you consider exposing the source map directory or path to rewriteSources?
Thank you!

Konstantin
Solution Brainstorm
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/2d0da5a00063f5d2758837a3b7648671bd11e33b/tests/demo/vite.config.ts#L28
Additional Context
No response
Priority
React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it.
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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
Expose source map path/dir to rewriteSources hook #20028
Closed
#20142
Closed
Expose source map path/dir to rewriteSources hook#20028
#20142
Assignees
chargome
Labels
FeatureSvelteKit
Description
@ktarmyshov
ktarmyshov
opened on Mar 27, 2026
Problem Statement
Dear Sentry Team,
I am integrating @sentry/sveltekit with a custom SvelteKit adapter for Azure Static Web Apps.
I was able to make the sourcemap flow work, but I ran into a limitation in the rewriteSources hook API.
Context:
  • My adapter is not one of the built-in adapter targets, so I use:
    sentrySvelteKit({ adapter: 'other', ... })
  • To keep sourcemaps correct in the final adapter output, I re-bundle / re-emit .svelte-kit/output/server and .svelte-kit/output/client into the adapter output directories instead of raw-copying them.
  • My demo/test app lives in ./tests/demo, so source paths need additional rewriting in a monorepo-style layout.
  • I currently solve this with:
    unstable_sentryVitePluginOptions.sourcemaps.rewriteSources
The problem:

today the hook only receives (source, map), but in my case I also need to know where the current source map file is located.
Something like this would be very helpful:
type RewriteSourcesHook = (source: string, map: any, mapPath: string) => string;
or at least:
type RewriteSourcesHook = (source: string, map: any, mapDir: string) => string;
Why this would help:

in order to rewrite relative source paths correctly, I need to resolve them relative to the source map location, not just relative to process.cwd().
Conceptually I need to do something like:
resolve(mapDir, source)
At the moment, because the hook does not provide the map location, I have to:
  1. scan directories,
  2. read .map files,
  3. find which map contains the given source entry,
  4. reconstruct the directory of that map,
  5. only then rewrite the source path.
So most of my implementation is just working around the missing mapDir / mapPath context.
Providing either mapDir or mapPath to the hook would remove most of that complexity and make rewriteSources much easier to use for custom adapters and monorepo-like layouts.
My current implementation is here for reference:
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
Would you consider exposing the source map directory or path to rewriteSources?
Thank you!

Konstantin
Solution Brainstorm
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/2d0da5a00063f5d2758837a3b7648671bd11e33b/tests/demo/vite.config.ts#L28
Additional Context
No response
Priority
React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it.
Metadata
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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('^' + ".*" + '

Skip to content
Expose source map path/dir to rewriteSources hook #20028
Closed
#20142
Closed
Expose source map path/dir to rewriteSources hook#20028
#20142
Assignees
chargome
Labels
FeatureSvelteKit
Description
@ktarmyshov
ktarmyshov
opened on Mar 27, 2026
Problem Statement
Dear Sentry Team,
I am integrating @sentry/sveltekit with a custom SvelteKit adapter for Azure Static Web Apps.
I was able to make the sourcemap flow work, but I ran into a limitation in the rewriteSources hook API.
Context:
  • My adapter is not one of the built-in adapter targets, so I use:
    sentrySvelteKit({ adapter: 'other', ... })
  • To keep sourcemaps correct in the final adapter output, I re-bundle / re-emit .svelte-kit/output/server and .svelte-kit/output/client into the adapter output directories instead of raw-copying them.
  • My demo/test app lives in ./tests/demo, so source paths need additional rewriting in a monorepo-style layout.
  • I currently solve this with:
    unstable_sentryVitePluginOptions.sourcemaps.rewriteSources
The problem:

today the hook only receives (source, map), but in my case I also need to know where the current source map file is located.
Something like this would be very helpful:
type RewriteSourcesHook = (source: string, map: any, mapPath: string) => string;
or at least:
type RewriteSourcesHook = (source: string, map: any, mapDir: string) => string;
Why this would help:

in order to rewrite relative source paths correctly, I need to resolve them relative to the source map location, not just relative to process.cwd().
Conceptually I need to do something like:
resolve(mapDir, source)
At the moment, because the hook does not provide the map location, I have to:
  1. scan directories,
  2. read .map files,
  3. find which map contains the given source entry,
  4. reconstruct the directory of that map,
  5. only then rewrite the source path.
So most of my implementation is just working around the missing mapDir / mapPath context.
Providing either mapDir or mapPath to the hook would remove most of that complexity and make rewriteSources much easier to use for custom adapters and monorepo-like layouts.
My current implementation is here for reference:
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
Would you consider exposing the source map directory or path to rewriteSources?
Thank you!

Konstantin
Solution Brainstorm
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/2d0da5a00063f5d2758837a3b7648671bd11e33b/tests/demo/vite.config.ts#L28
Additional Context
No response
Priority
React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it.
Metadata
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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" + '

Skip to content
Expose source map path/dir to rewriteSources hook #20028
Closed
#20142
Closed
Expose source map path/dir to rewriteSources hook#20028
#20142
Assignees
chargome
Labels
FeatureSvelteKit
Description
@ktarmyshov
ktarmyshov
opened on Mar 27, 2026
Problem Statement
Dear Sentry Team,
I am integrating @sentry/sveltekit with a custom SvelteKit adapter for Azure Static Web Apps.
I was able to make the sourcemap flow work, but I ran into a limitation in the rewriteSources hook API.
Context:
  • My adapter is not one of the built-in adapter targets, so I use:
    sentrySvelteKit({ adapter: 'other', ... })
  • To keep sourcemaps correct in the final adapter output, I re-bundle / re-emit .svelte-kit/output/server and .svelte-kit/output/client into the adapter output directories instead of raw-copying them.
  • My demo/test app lives in ./tests/demo, so source paths need additional rewriting in a monorepo-style layout.
  • I currently solve this with:
    unstable_sentryVitePluginOptions.sourcemaps.rewriteSources
The problem:

today the hook only receives (source, map), but in my case I also need to know where the current source map file is located.
Something like this would be very helpful:
type RewriteSourcesHook = (source: string, map: any, mapPath: string) => string;
or at least:
type RewriteSourcesHook = (source: string, map: any, mapDir: string) => string;
Why this would help:

in order to rewrite relative source paths correctly, I need to resolve them relative to the source map location, not just relative to process.cwd().
Conceptually I need to do something like:
resolve(mapDir, source)
At the moment, because the hook does not provide the map location, I have to:
  1. scan directories,
  2. read .map files,
  3. find which map contains the given source entry,
  4. reconstruct the directory of that map,
  5. only then rewrite the source path.
So most of my implementation is just working around the missing mapDir / mapPath context.
Providing either mapDir or mapPath to the hook would remove most of that complexity and make rewriteSources much easier to use for custom adapters and monorepo-like layouts.
My current implementation is here for reference:
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
Would you consider exposing the source map directory or path to rewriteSources?
Thank you!

Konstantin
Solution Brainstorm
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/2d0da5a00063f5d2758837a3b7648671bd11e33b/tests/demo/vite.config.ts#L28
Additional Context
No response
Priority
React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it.
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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
Expose source map path/dir to rewriteSources hook #20028
Closed
#20142
Closed
Expose source map path/dir to rewriteSources hook#20028
#20142
Assignees
chargome
Labels
FeatureSvelteKit
Description
@ktarmyshov
ktarmyshov
opened on Mar 27, 2026
Problem Statement
Dear Sentry Team,
I am integrating @sentry/sveltekit with a custom SvelteKit adapter for Azure Static Web Apps.
I was able to make the sourcemap flow work, but I ran into a limitation in the rewriteSources hook API.
Context:
  • My adapter is not one of the built-in adapter targets, so I use:
    sentrySvelteKit({ adapter: 'other', ... })
  • To keep sourcemaps correct in the final adapter output, I re-bundle / re-emit .svelte-kit/output/server and .svelte-kit/output/client into the adapter output directories instead of raw-copying them.
  • My demo/test app lives in ./tests/demo, so source paths need additional rewriting in a monorepo-style layout.
  • I currently solve this with:
    unstable_sentryVitePluginOptions.sourcemaps.rewriteSources
The problem:

today the hook only receives (source, map), but in my case I also need to know where the current source map file is located.
Something like this would be very helpful:
type RewriteSourcesHook = (source: string, map: any, mapPath: string) => string;
or at least:
type RewriteSourcesHook = (source: string, map: any, mapDir: string) => string;
Why this would help:

in order to rewrite relative source paths correctly, I need to resolve them relative to the source map location, not just relative to process.cwd().
Conceptually I need to do something like:
resolve(mapDir, source)
At the moment, because the hook does not provide the map location, I have to:
  1. scan directories,
  2. read .map files,
  3. find which map contains the given source entry,
  4. reconstruct the directory of that map,
  5. only then rewrite the source path.
So most of my implementation is just working around the missing mapDir / mapPath context.
Providing either mapDir or mapPath to the hook would remove most of that complexity and make rewriteSources much easier to use for custom adapters and monorepo-like layouts.
My current implementation is here for reference:
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
Would you consider exposing the source map directory or path to rewriteSources?
Thank you!

Konstantin
Solution Brainstorm
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/2d0da5a00063f5d2758837a3b7648671bd11e33b/tests/demo/vite.config.ts#L28
Additional Context
No response
Priority
React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it.
Metadata
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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('^' + ".*" + '

Skip to content
Expose source map path/dir to rewriteSources hook #20028
Closed
#20142
Closed
Expose source map path/dir to rewriteSources hook#20028
#20142
Assignees
chargome
Labels
FeatureSvelteKit
Description
@ktarmyshov
ktarmyshov
opened on Mar 27, 2026
Problem Statement
Dear Sentry Team,
I am integrating @sentry/sveltekit with a custom SvelteKit adapter for Azure Static Web Apps.
I was able to make the sourcemap flow work, but I ran into a limitation in the rewriteSources hook API.
Context:
  • My adapter is not one of the built-in adapter targets, so I use:
    sentrySvelteKit({ adapter: 'other', ... })
  • To keep sourcemaps correct in the final adapter output, I re-bundle / re-emit .svelte-kit/output/server and .svelte-kit/output/client into the adapter output directories instead of raw-copying them.
  • My demo/test app lives in ./tests/demo, so source paths need additional rewriting in a monorepo-style layout.
  • I currently solve this with:
    unstable_sentryVitePluginOptions.sourcemaps.rewriteSources
The problem:

today the hook only receives (source, map), but in my case I also need to know where the current source map file is located.
Something like this would be very helpful:
type RewriteSourcesHook = (source: string, map: any, mapPath: string) => string;
or at least:
type RewriteSourcesHook = (source: string, map: any, mapDir: string) => string;
Why this would help:

in order to rewrite relative source paths correctly, I need to resolve them relative to the source map location, not just relative to process.cwd().
Conceptually I need to do something like:
resolve(mapDir, source)
At the moment, because the hook does not provide the map location, I have to:
  1. scan directories,
  2. read .map files,
  3. find which map contains the given source entry,
  4. reconstruct the directory of that map,
  5. only then rewrite the source path.
So most of my implementation is just working around the missing mapDir / mapPath context.
Providing either mapDir or mapPath to the hook would remove most of that complexity and make rewriteSources much easier to use for custom adapters and monorepo-like layouts.
My current implementation is here for reference:
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
Would you consider exposing the source map directory or path to rewriteSources?
Thank you!

Konstantin
Solution Brainstorm
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/2d0da5a00063f5d2758837a3b7648671bd11e33b/tests/demo/vite.config.ts#L28
Additional Context
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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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Expose source map path/dir to rewriteSources hook #20028
Closed
#20142
Closed
Expose source map path/dir to rewriteSources hook#20028
#20142
Assignees
chargome
Labels
FeatureSvelteKit
Description
@ktarmyshov
ktarmyshov
opened on Mar 27, 2026
Problem Statement
Dear Sentry Team,
I am integrating @sentry/sveltekit with a custom SvelteKit adapter for Azure Static Web Apps.
I was able to make the sourcemap flow work, but I ran into a limitation in the rewriteSources hook API.
Context:
  • My adapter is not one of the built-in adapter targets, so I use:
    sentrySvelteKit({ adapter: 'other', ... })
  • To keep sourcemaps correct in the final adapter output, I re-bundle / re-emit .svelte-kit/output/server and .svelte-kit/output/client into the adapter output directories instead of raw-copying them.
  • My demo/test app lives in ./tests/demo, so source paths need additional rewriting in a monorepo-style layout.
  • I currently solve this with:
    unstable_sentryVitePluginOptions.sourcemaps.rewriteSources
The problem:

today the hook only receives (source, map), but in my case I also need to know where the current source map file is located.
Something like this would be very helpful:
type RewriteSourcesHook = (source: string, map: any, mapPath: string) => string;
or at least:
type RewriteSourcesHook = (source: string, map: any, mapDir: string) => string;
Why this would help:

in order to rewrite relative source paths correctly, I need to resolve them relative to the source map location, not just relative to process.cwd().
Conceptually I need to do something like:
resolve(mapDir, source)
At the moment, because the hook does not provide the map location, I have to:
  1. scan directories,
  2. read .map files,
  3. find which map contains the given source entry,
  4. reconstruct the directory of that map,
  5. only then rewrite the source path.
So most of my implementation is just working around the missing mapDir / mapPath context.
Providing either mapDir or mapPath to the hook would remove most of that complexity and make rewriteSources much easier to use for custom adapters and monorepo-like layouts.
My current implementation is here for reference:
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
Would you consider exposing the source map directory or path to rewriteSources?
Thank you!

Konstantin
Solution Brainstorm
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/main/src/utils.js
https://github.com/kt-npm-modules/svelte-adapter-azure-swa/blob/2d0da5a00063f5d2758837a3b7648671bd11e33b/tests/demo/vite.config.ts#L28
Additional Context
No response
Priority
React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it.
Metadata
Metadata
Assignees
Labels
FeatureSvelteKit
Projects
Milestone
No milestone
Relationships
None yet
Development
No branches or pull requests
Issue actions