module: add a read-only mode to the compile cache - #65302

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module: add a read-only mode to the compile cache#65302
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A compile cache generated ahead of time and shipped inside an application package should only ever be read: the package may be immutable (an Electron app.asar, a read-only image) or covered by an integrity check, and a cache directory that appears at run time next to shipped code is a surprise either way. Today enabling the cache always implies writing: the tag directory is created on enable, and every module without an accepted entry is serialized and persisted at exit or on flushCompileCache().

This adds readOnly to module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1. With it, existing entries are looked up and loaded exactly as before; nothing is serialized into the in-memory store or written to disk, flushCompileCache() is a no-op, the write-permission check is skipped, and the cache directory is used as found rather than created, so enabling against a directory that does not exist fails (FAILED, with a message) instead of making one.

EnableOption becomes a small flag set (PORTABLE, READ_ONLY) since the two combine. Docs cover the option, the environment variable (cli.md, node.1) and a short section in module.md; test-compile-cache-api-readonly covers the missing-directory case, reading a previously generated cache without writing new entries, and the environment variable.

Context: same application as #65293 (an Electron app shipping its main-process cache in the package); review there asked that production launches never attempt writes.

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Codecov Report

❌ Patch coverage is 79.10448% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.13%. Comparing base (bc813a7) to head (f201d83).
⚠️ Report is 142 commits behind head on main.

Files with missing linesPatch %Lines
src/compile_cache.cc75.60%5 Missing and 5 partials ⚠️
src/env.cc50.00%1 Missing and 3 partials ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #65302 +/- ##
==========================================
- Coverage 90.32% 90.13% -0.19% 
==========================================
Files 751 751 Lines 249960 252344 +2384 Branches 47204 47452 +248 ==========================================
+ Hits 225774 227448 +1674 - Misses 15564 16193 +629 - Partials 8622 8703 +81
Files with missing linesCoverage Δ
lib/internal/modules/helpers.js98.94% <100.00%> (+<0.01%)⬆️
src/compile_cache.h100.00% <100.00%> (ø)
src/node_modules.cc80.22% <100.00%> (-0.01%)⬇️
src/env.cc85.24% <50.00%> (-0.18%)⬇️
src/compile_cache.cc79.94% <75.60%> (+0.85%)⬆️

... and 119 files with indirect coverage changes

🚀 New features to boost your workflow:
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----------------------------------- PR info ------------------------------------
Title module: add a read-only mode to the compile cache (#65302)
Author Shelley Vohr <shelley.vohr@gmail.com> (@codebytere)
Branch codebytere:compile-cache-read-only -> nodejs:main
Labels c++, lib / src, commit-queue
Commits 1
- module: add a read-only mode to the compile cache
Committers 1
- Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
--------------------------------------------------------------------------------
ℹ This PR was created on Sat, 15 Aug 2026 08:56:32 GMT
✔ Approvals: 1
✔ - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/65302#pullrequestreview-4948260342
✘ This PR needs to wait 91 more hours to land (or 0 minutes if there is one more approval)
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@aduh95 PTAL when you have a moment!

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Comment threaddoc/api/module.md Outdated
Comment threadsrc/compile_cache.cc
Comment on lines +594 to +599
if (!is_dir) {
result.message =
"Cache directory does not exist (read-only): " + cache_dir_with_tag;
result.status = CompileCacheEnableStatus::FAILED;
return result;
}

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Should this emit a warning?

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i don't think so, for consistency: none of the other FAILED paths here (can't create the directory, not writable) warn either. through module.enableCompileCache() the caller gets { status, message } back and can decide what to do with it, and for NODE_COMPILE_CACHE the existing behavior is an inherited env var never adds output to a program that didn't ask for the cache; NODE_DEBUG_NATIVE=COMPILE_CACHE prints it. happy to add one if you feel strongly, but i'd rather do it for all the FAILED cases at once in a follow-up than special-case read-only.

@codebytere
module: add a read-only mode to the compile cache
f201d83
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
@codebytere
codebytereforce-pushed the compile-cache-read-only branch from dc597d8 to f201d83CompareAugust 21, 2026 18:17
@codebyterecodebytere added the request-ci Add this label to start a Jenkins CI on a PR. label Aug 21, 2026
@Renegade334Renegade334 added the author ready PRs with CI started, the required approvals, and no outstanding review comments. label Aug 21, 2026
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aduh95 pushed a commit that referenced this pull request Aug 25, 2026
@codebytere@aduh95
module: add a read-only mode to the compile cache
94de25a
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
aduh95 pushed a commit that referenced this pull request Aug 25, 2026
@codebytere@aduh95
module: add a read-only mode to the compile cache
97a437e
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
@github-actionsgithub-actionsBot mentioned this pull request Aug 25, 2026
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
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try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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module: add a read-only mode to the compile cache - #65302
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codebytere:compile-cache-read-only
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module: add a read-only mode to the compile cache#65302
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A compile cache generated ahead of time and shipped inside an application package should only ever be read: the package may be immutable (an Electron app.asar, a read-only image) or covered by an integrity check, and a cache directory that appears at run time next to shipped code is a surprise either way. Today enabling the cache always implies writing: the tag directory is created on enable, and every module without an accepted entry is serialized and persisted at exit or on flushCompileCache().
This adds readOnly to module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1. With it, existing entries are looked up and loaded exactly as before; nothing is serialized into the in-memory store or written to disk, flushCompileCache() is a no-op, the write-permission check is skipped, and the cache directory is used as found rather than created, so enabling against a directory that does not exist fails (FAILED, with a message) instead of making one.
EnableOption becomes a small flag set (PORTABLE, READ_ONLY) since the two combine. Docs cover the option, the environment variable (cli.md, node.1) and a short section in module.md; test-compile-cache-api-readonly covers the missing-directory case, reading a previously generated cache without writing new entries, and the environment variable.
Context: same application as #65293 (an Electron app shipping its main-process cache in the package); review there asked that production launches never attempt writes.
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Codecov Report
❌ Patch coverage is 79.10448% with 14 lines in your changes missing coverage. Please review.

✅ Project coverage is 90.13%. Comparing base (bc813a7) to head (f201d83).
⚠️ Report is 142 commits behind head on main.
Files with missing linesPatch %Lines
src/compile_cache.cc75.60%5 Missing and 5 partials ⚠️
src/env.cc50.00%1 Missing and 3 partials ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #65302 +/- ##
==========================================
- Coverage 90.32% 90.13% -0.19% 
==========================================
Files 751 751 Lines 249960 252344 +2384 Branches 47204 47452 +248 ==========================================
+ Hits 225774 227448 +1674 - Misses 15564 16193 +629 - Partials 8622 8703 +81 
Files with missing linesCoverage Δ
lib/internal/modules/helpers.js98.94% <100.00%> (+<0.01%)⬆️
src/compile_cache.h100.00% <100.00%> (ø)
src/node_modules.cc80.22% <100.00%> (-0.01%)⬇️
src/env.cc85.24% <50.00%> (-0.18%)⬇️
src/compile_cache.cc79.94% <75.60%> (+0.85%)⬆️
... and 119 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
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----------------------------------- PR info ------------------------------------
Title module: add a read-only mode to the compile cache (#65302)
Author Shelley Vohr <shelley.vohr@gmail.com> (@codebytere)
Branch codebytere:compile-cache-read-only -> nodejs:main
Labels c++, lib / src, commit-queue
Commits 1
- module: add a read-only mode to the compile cache
Committers 1
- Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
--------------------------------------------------------------------------------
ℹ This PR was created on Sat, 15 Aug 2026 08:56:32 GMT
✔ Approvals: 1
✔ - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/65302#pullrequestreview-4948260342
✘ This PR needs to wait 91 more hours to land (or 0 minutes if there is one more approval)
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@aduh95 PTAL when you have a moment!
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Comment threaddoc/api/module.md
Outdated

Comment threadsrc/compile_cache.cc

Comment on lines

+594
 to 
+599

 if (!is_dir) {
 result.message =
 "Cache directory does not exist (read-only): " + cache_dir_with_tag;
 result.status = CompileCacheEnableStatus::FAILED;
 return result;
 }
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Should this emit a warning?
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i don't think so, for consistency: none of the other FAILED paths here (can't create the directory, not writable) warn either. through module.enableCompileCache() the caller gets { status, message } back and can decide what to do with it, and for NODE_COMPILE_CACHE the existing behavior is an inherited env var never adds output to a program that didn't ask for the cache; NODE_DEBUG_NATIVE=COMPILE_CACHE prints it. happy to add one if you feel strongly, but i'd rather do it for all the FAILED cases at once in a follow-up than special-case read-only.
@codebytere
module: add a read-only mode to the compile cache
f201d83
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
@codebytere
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module: add a read-only mode to the compile cache
94de25a
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
aduh95 pushed a commit
that referenced
this pull request
Aug 25, 2026
@codebytere@aduh95
module: add a read-only mode to the compile cache
97a437e
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
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module: add a read-only mode to the compile cache - #65302
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A compile cache generated ahead of time and shipped inside an application package should only ever be read: the package may be immutable (an Electron app.asar, a read-only image) or covered by an integrity check, and a cache directory that appears at run time next to shipped code is a surprise either way. Today enabling the cache always implies writing: the tag directory is created on enable, and every module without an accepted entry is serialized and persisted at exit or on flushCompileCache().
This adds readOnly to module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1. With it, existing entries are looked up and loaded exactly as before; nothing is serialized into the in-memory store or written to disk, flushCompileCache() is a no-op, the write-permission check is skipped, and the cache directory is used as found rather than created, so enabling against a directory that does not exist fails (FAILED, with a message) instead of making one.
EnableOption becomes a small flag set (PORTABLE, READ_ONLY) since the two combine. Docs cover the option, the environment variable (cli.md, node.1) and a short section in module.md; test-compile-cache-api-readonly covers the missing-directory case, reading a previously generated cache without writing new entries, and the environment variable.
Context: same application as #65293 (an Electron app shipping its main-process cache in the package); review there asked that production launches never attempt writes.
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❌ Patch coverage is 79.10448% with 14 lines in your changes missing coverage. Please review.

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@@ Coverage Diff @@## main #65302 +/- ##
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+ Hits 225774 227448 +1674 - Misses 15564 16193 +629 - Partials 8622 8703 +81 
Files with missing linesCoverage Δ
lib/internal/modules/helpers.js98.94% <100.00%> (+<0.01%)⬆️
src/compile_cache.h100.00% <100.00%> (ø)
src/node_modules.cc80.22% <100.00%> (-0.01%)⬇️
src/env.cc85.24% <50.00%> (-0.18%)⬇️
src/compile_cache.cc79.94% <75.60%> (+0.85%)⬆️
... and 119 files with indirect coverage changes
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----------------------------------- PR info ------------------------------------
Title module: add a read-only mode to the compile cache (#65302)
Author Shelley Vohr <shelley.vohr@gmail.com> (@codebytere)
Branch codebytere:compile-cache-read-only -> nodejs:main
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PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
--------------------------------------------------------------------------------
ℹ This PR was created on Sat, 15 Aug 2026 08:56:32 GMT
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Comment threadsrc/compile_cache.cc

Comment on lines

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+599

 if (!is_dir) {
 result.message =
 "Cache directory does not exist (read-only): " + cache_dir_with_tag;
 result.status = CompileCacheEnableStatus::FAILED;
 return result;
 }
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Should this emit a warning?
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i don't think so, for consistency: none of the other FAILED paths here (can't create the directory, not writable) warn either. through module.enableCompileCache() the caller gets { status, message } back and can decide what to do with it, and for NODE_COMPILE_CACHE the existing behavior is an inherited env var never adds output to a program that didn't ask for the cache; NODE_DEBUG_NATIVE=COMPILE_CACHE prints it. happy to add one if you feel strongly, but i'd rather do it for all the FAILED cases at once in a follow-up than special-case read-only.
@codebytere
module: add a read-only mode to the compile cache
f201d83
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
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module: add a read-only mode to the compile cache
94de25a
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
aduh95 pushed a commit
that referenced
this pull request
Aug 25, 2026
@codebytere@aduh95
module: add a read-only mode to the compile cache
97a437e
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
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A compile cache generated ahead of time and shipped inside an application package should only ever be read: the package may be immutable (an Electron app.asar, a read-only image) or covered by an integrity check, and a cache directory that appears at run time next to shipped code is a surprise either way. Today enabling the cache always implies writing: the tag directory is created on enable, and every module without an accepted entry is serialized and persisted at exit or on flushCompileCache().
This adds readOnly to module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1. With it, existing entries are looked up and loaded exactly as before; nothing is serialized into the in-memory store or written to disk, flushCompileCache() is a no-op, the write-permission check is skipped, and the cache directory is used as found rather than created, so enabling against a directory that does not exist fails (FAILED, with a message) instead of making one.
EnableOption becomes a small flag set (PORTABLE, READ_ONLY) since the two combine. Docs cover the option, the environment variable (cli.md, node.1) and a short section in module.md; test-compile-cache-api-readonly covers the missing-directory case, reading a previously generated cache without writing new entries, and the environment variable.
Context: same application as #65293 (an Electron app shipping its main-process cache in the package); review there asked that production launches never attempt writes.
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❌ Patch coverage is 79.10448% with 14 lines in your changes missing coverage. Please review.

✅ Project coverage is 90.13%. Comparing base (bc813a7) to head (f201d83).
⚠️ Report is 142 commits behind head on main.
Files with missing linesPatch %Lines
src/compile_cache.cc75.60%5 Missing and 5 partials ⚠️
src/env.cc50.00%1 Missing and 3 partials ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #65302 +/- ##
==========================================
- Coverage 90.32% 90.13% -0.19% 
==========================================
Files 751 751 Lines 249960 252344 +2384 Branches 47204 47452 +248 ==========================================
+ Hits 225774 227448 +1674 - Misses 15564 16193 +629 - Partials 8622 8703 +81 
Files with missing linesCoverage Δ
lib/internal/modules/helpers.js98.94% <100.00%> (+<0.01%)⬆️
src/compile_cache.h100.00% <100.00%> (ø)
src/node_modules.cc80.22% <100.00%> (-0.01%)⬇️
src/env.cc85.24% <50.00%> (-0.18%)⬇️
src/compile_cache.cc79.94% <75.60%> (+0.85%)⬆️
... and 119 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
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----------------------------------- PR info ------------------------------------
Title module: add a read-only mode to the compile cache (#65302)
Author Shelley Vohr <shelley.vohr@gmail.com> (@codebytere)
Branch codebytere:compile-cache-read-only -> nodejs:main
Labels c++, lib / src, commit-queue
Commits 1
- module: add a read-only mode to the compile cache
Committers 1
- Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
--------------------------------------------------------------------------------
ℹ This PR was created on Sat, 15 Aug 2026 08:56:32 GMT
✔ Approvals: 1
✔ - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/65302#pullrequestreview-4948260342
✘ This PR needs to wait 91 more hours to land (or 0 minutes if there is one more approval)
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Comment threaddoc/api/module.md
Outdated

Comment threadsrc/compile_cache.cc

Comment on lines

+594
 to 
+599

 if (!is_dir) {
 result.message =
 "Cache directory does not exist (read-only): " + cache_dir_with_tag;
 result.status = CompileCacheEnableStatus::FAILED;
 return result;
 }
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Should this emit a warning?
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i don't think so, for consistency: none of the other FAILED paths here (can't create the directory, not writable) warn either. through module.enableCompileCache() the caller gets { status, message } back and can decide what to do with it, and for NODE_COMPILE_CACHE the existing behavior is an inherited env var never adds output to a program that didn't ask for the cache; NODE_DEBUG_NATIVE=COMPILE_CACHE prints it. happy to add one if you feel strongly, but i'd rather do it for all the FAILED cases at once in a follow-up than special-case read-only.
@codebytere
module: add a read-only mode to the compile cache
f201d83
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
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module: add a read-only mode to the compile cache
94de25a
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
aduh95 pushed a commit
that referenced
this pull request
Aug 25, 2026
@codebytere@aduh95
module: add a read-only mode to the compile cache
97a437e
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
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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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module: add a read-only mode to the compile cache - #65302
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A compile cache generated ahead of time and shipped inside an application package should only ever be read: the package may be immutable (an Electron app.asar, a read-only image) or covered by an integrity check, and a cache directory that appears at run time next to shipped code is a surprise either way. Today enabling the cache always implies writing: the tag directory is created on enable, and every module without an accepted entry is serialized and persisted at exit or on flushCompileCache().
This adds readOnly to module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1. With it, existing entries are looked up and loaded exactly as before; nothing is serialized into the in-memory store or written to disk, flushCompileCache() is a no-op, the write-permission check is skipped, and the cache directory is used as found rather than created, so enabling against a directory that does not exist fails (FAILED, with a message) instead of making one.
EnableOption becomes a small flag set (PORTABLE, READ_ONLY) since the two combine. Docs cover the option, the environment variable (cli.md, node.1) and a short section in module.md; test-compile-cache-api-readonly covers the missing-directory case, reading a previously generated cache without writing new entries, and the environment variable.
Context: same application as #65293 (an Electron app shipping its main-process cache in the package); review there asked that production launches never attempt writes.
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Codecov Report
❌ Patch coverage is 79.10448% with 14 lines in your changes missing coverage. Please review.

✅ Project coverage is 90.13%. Comparing base (bc813a7) to head (f201d83).
⚠️ Report is 142 commits behind head on main.
Files with missing linesPatch %Lines
src/compile_cache.cc75.60%5 Missing and 5 partials ⚠️
src/env.cc50.00%1 Missing and 3 partials ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #65302 +/- ##
==========================================
- Coverage 90.32% 90.13% -0.19% 
==========================================
Files 751 751 Lines 249960 252344 +2384 Branches 47204 47452 +248 ==========================================
+ Hits 225774 227448 +1674 - Misses 15564 16193 +629 - Partials 8622 8703 +81 
Files with missing linesCoverage Δ
lib/internal/modules/helpers.js98.94% <100.00%> (+<0.01%)⬆️
src/compile_cache.h100.00% <100.00%> (ø)
src/node_modules.cc80.22% <100.00%> (-0.01%)⬇️
src/env.cc85.24% <50.00%> (-0.18%)⬇️
src/compile_cache.cc79.94% <75.60%> (+0.85%)⬆️
... and 119 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
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----------------------------------- PR info ------------------------------------
Title module: add a read-only mode to the compile cache (#65302)
Author Shelley Vohr <shelley.vohr@gmail.com> (@codebytere)
Branch codebytere:compile-cache-read-only -> nodejs:main
Labels c++, lib / src, commit-queue
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- module: add a read-only mode to the compile cache
Committers 1
- Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
--------------------------------------------------------------------------------
ℹ This PR was created on Sat, 15 Aug 2026 08:56:32 GMT
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✔ - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/65302#pullrequestreview-4948260342
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@aduh95 PTAL when you have a moment!
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Comment threaddoc/api/module.md
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Comment threadsrc/compile_cache.cc

Comment on lines

+594
 to 
+599

 if (!is_dir) {
 result.message =
 "Cache directory does not exist (read-only): " + cache_dir_with_tag;
 result.status = CompileCacheEnableStatus::FAILED;
 return result;
 }
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Should this emit a warning?
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i don't think so, for consistency: none of the other FAILED paths here (can't create the directory, not writable) warn either. through module.enableCompileCache() the caller gets { status, message } back and can decide what to do with it, and for NODE_COMPILE_CACHE the existing behavior is an inherited env var never adds output to a program that didn't ask for the cache; NODE_DEBUG_NATIVE=COMPILE_CACHE prints it. happy to add one if you feel strongly, but i'd rather do it for all the FAILED cases at once in a follow-up than special-case read-only.
@codebytere
module: add a read-only mode to the compile cache
f201d83
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
@codebytere
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module: add a read-only mode to the compile cache
94de25a
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
aduh95 pushed a commit
that referenced
this pull request
Aug 25, 2026
@codebytere@aduh95
module: add a read-only mode to the compile cache
97a437e
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
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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('^' + ".*" + '

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A compile cache generated ahead of time and shipped inside an application package should only ever be read: the package may be immutable (an Electron app.asar, a read-only image) or covered by an integrity check, and a cache directory that appears at run time next to shipped code is a surprise either way. Today enabling the cache always implies writing: the tag directory is created on enable, and every module without an accepted entry is serialized and persisted at exit or on flushCompileCache().
This adds readOnly to module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1. With it, existing entries are looked up and loaded exactly as before; nothing is serialized into the in-memory store or written to disk, flushCompileCache() is a no-op, the write-permission check is skipped, and the cache directory is used as found rather than created, so enabling against a directory that does not exist fails (FAILED, with a message) instead of making one.
EnableOption becomes a small flag set (PORTABLE, READ_ONLY) since the two combine. Docs cover the option, the environment variable (cli.md, node.1) and a short section in module.md; test-compile-cache-api-readonly covers the missing-directory case, reading a previously generated cache without writing new entries, and the environment variable.
Context: same application as #65293 (an Electron app shipping its main-process cache in the package); review there asked that production launches never attempt writes.
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Codecov Report
❌ Patch coverage is 79.10448% with 14 lines in your changes missing coverage. Please review.

✅ Project coverage is 90.13%. Comparing base (bc813a7) to head (f201d83).
⚠️ Report is 142 commits behind head on main.
Files with missing linesPatch %Lines
src/compile_cache.cc75.60%5 Missing and 5 partials ⚠️
src/env.cc50.00%1 Missing and 3 partials ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #65302 +/- ##
==========================================
- Coverage 90.32% 90.13% -0.19% 
==========================================
Files 751 751 Lines 249960 252344 +2384 Branches 47204 47452 +248 ==========================================
+ Hits 225774 227448 +1674 - Misses 15564 16193 +629 - Partials 8622 8703 +81 
Files with missing linesCoverage Δ
lib/internal/modules/helpers.js98.94% <100.00%> (+<0.01%)⬆️
src/compile_cache.h100.00% <100.00%> (ø)
src/node_modules.cc80.22% <100.00%> (-0.01%)⬇️
src/env.cc85.24% <50.00%> (-0.18%)⬇️
src/compile_cache.cc79.94% <75.60%> (+0.85%)⬆️
... and 119 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
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----------------------------------- PR info ------------------------------------
Title module: add a read-only mode to the compile cache (#65302)
Author Shelley Vohr <shelley.vohr@gmail.com> (@codebytere)
Branch codebytere:compile-cache-read-only -> nodejs:main
Labels c++, lib / src, commit-queue
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- module: add a read-only mode to the compile cache
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PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
--------------------------------------------------------------------------------
ℹ This PR was created on Sat, 15 Aug 2026 08:56:32 GMT
✔ Approvals: 1
✔ - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/65302#pullrequestreview-4948260342
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Comment threadsrc/compile_cache.cc

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+594
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+599

 if (!is_dir) {
 result.message =
 "Cache directory does not exist (read-only): " + cache_dir_with_tag;
 result.status = CompileCacheEnableStatus::FAILED;
 return result;
 }
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Should this emit a warning?
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i don't think so, for consistency: none of the other FAILED paths here (can't create the directory, not writable) warn either. through module.enableCompileCache() the caller gets { status, message } back and can decide what to do with it, and for NODE_COMPILE_CACHE the existing behavior is an inherited env var never adds output to a program that didn't ask for the cache; NODE_DEBUG_NATIVE=COMPILE_CACHE prints it. happy to add one if you feel strongly, but i'd rather do it for all the FAILED cases at once in a follow-up than special-case read-only.
@codebytere
module: add a read-only mode to the compile cache
f201d83
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
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module: add a read-only mode to the compile cache
94de25a
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
aduh95 pushed a commit
that referenced
this pull request
Aug 25, 2026
@codebytere@aduh95
module: add a read-only mode to the compile cache
97a437e
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
@github-actionsgithub-actionsBot
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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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module: add a read-only mode to the compile cache - #65302
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module: add a read-only mode to the compile cache#65302
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A compile cache generated ahead of time and shipped inside an application package should only ever be read: the package may be immutable (an Electron app.asar, a read-only image) or covered by an integrity check, and a cache directory that appears at run time next to shipped code is a surprise either way. Today enabling the cache always implies writing: the tag directory is created on enable, and every module without an accepted entry is serialized and persisted at exit or on flushCompileCache().
This adds readOnly to module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1. With it, existing entries are looked up and loaded exactly as before; nothing is serialized into the in-memory store or written to disk, flushCompileCache() is a no-op, the write-permission check is skipped, and the cache directory is used as found rather than created, so enabling against a directory that does not exist fails (FAILED, with a message) instead of making one.
EnableOption becomes a small flag set (PORTABLE, READ_ONLY) since the two combine. Docs cover the option, the environment variable (cli.md, node.1) and a short section in module.md; test-compile-cache-api-readonly covers the missing-directory case, reading a previously generated cache without writing new entries, and the environment variable.
Context: same application as #65293 (an Electron app shipping its main-process cache in the package); review there asked that production launches never attempt writes.
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Codecov Report
❌ Patch coverage is 79.10448% with 14 lines in your changes missing coverage. Please review.

✅ Project coverage is 90.13%. Comparing base (bc813a7) to head (f201d83).
⚠️ Report is 142 commits behind head on main.
Files with missing linesPatch %Lines
src/compile_cache.cc75.60%5 Missing and 5 partials ⚠️
src/env.cc50.00%1 Missing and 3 partials ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #65302 +/- ##
==========================================
- Coverage 90.32% 90.13% -0.19% 
==========================================
Files 751 751 Lines 249960 252344 +2384 Branches 47204 47452 +248 ==========================================
+ Hits 225774 227448 +1674 - Misses 15564 16193 +629 - Partials 8622 8703 +81 
Files with missing linesCoverage Δ
lib/internal/modules/helpers.js98.94% <100.00%> (+<0.01%)⬆️
src/compile_cache.h100.00% <100.00%> (ø)
src/node_modules.cc80.22% <100.00%> (-0.01%)⬇️
src/env.cc85.24% <50.00%> (-0.18%)⬇️
src/compile_cache.cc79.94% <75.60%> (+0.85%)⬆️
... and 119 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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✔ Done loading data for nodejs/node/pull/65302
----------------------------------- PR info ------------------------------------
Title module: add a read-only mode to the compile cache (#65302)
Author Shelley Vohr <shelley.vohr@gmail.com> (@codebytere)
Branch codebytere:compile-cache-read-only -> nodejs:main
Labels c++, lib / src, commit-queue
Commits 1
- module: add a read-only mode to the compile cache
Committers 1
- Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
--------------------------------------------------------------------------------
ℹ This PR was created on Sat, 15 Aug 2026 08:56:32 GMT
✔ Approvals: 1
✔ - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/65302#pullrequestreview-4948260342
✘ This PR needs to wait 91 more hours to land (or 0 minutes if there is one more approval)
✔ Last GitHub CI successful
ℹ Last Full PR CI on 2026-08-17T03:52:44Z: https://ci.nodejs.org/job/node-test-pull-request/75904/
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✔ Aborted `git node land` session in /home/runner/work/node/node/.ncu
https://github.com/nodejs/node/actions/runs/32149688331
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Comment threaddoc/api/module.md
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Comment threadsrc/compile_cache.cc

Comment on lines

+594
 to 
+599

 if (!is_dir) {
 result.message =
 "Cache directory does not exist (read-only): " + cache_dir_with_tag;
 result.status = CompileCacheEnableStatus::FAILED;
 return result;
 }
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Should this emit a warning?
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i don't think so, for consistency: none of the other FAILED paths here (can't create the directory, not writable) warn either. through module.enableCompileCache() the caller gets { status, message } back and can decide what to do with it, and for NODE_COMPILE_CACHE the existing behavior is an inherited env var never adds output to a program that didn't ask for the cache; NODE_DEBUG_NATIVE=COMPILE_CACHE prints it. happy to add one if you feel strongly, but i'd rather do it for all the FAILED cases at once in a follow-up than special-case read-only.
@codebytere
module: add a read-only mode to the compile cache
f201d83
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
@codebytere
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module: add a read-only mode to the compile cache
94de25a
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
aduh95 pushed a commit
that referenced
this pull request
Aug 25, 2026
@codebytere@aduh95
module: add a read-only mode to the compile cache
97a437e
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
@github-actionsgithub-actionsBot
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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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A compile cache generated ahead of time and shipped inside an application package should only ever be read: the package may be immutable (an Electron app.asar, a read-only image) or covered by an integrity check, and a cache directory that appears at run time next to shipped code is a surprise either way. Today enabling the cache always implies writing: the tag directory is created on enable, and every module without an accepted entry is serialized and persisted at exit or on flushCompileCache().
This adds readOnly to module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1. With it, existing entries are looked up and loaded exactly as before; nothing is serialized into the in-memory store or written to disk, flushCompileCache() is a no-op, the write-permission check is skipped, and the cache directory is used as found rather than created, so enabling against a directory that does not exist fails (FAILED, with a message) instead of making one.
EnableOption becomes a small flag set (PORTABLE, READ_ONLY) since the two combine. Docs cover the option, the environment variable (cli.md, node.1) and a short section in module.md; test-compile-cache-api-readonly covers the missing-directory case, reading a previously generated cache without writing new entries, and the environment variable.
Context: same application as #65293 (an Electron app shipping its main-process cache in the package); review there asked that production launches never attempt writes.
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Codecov Report
❌ Patch coverage is 79.10448% with 14 lines in your changes missing coverage. Please review.

✅ Project coverage is 90.13%. Comparing base (bc813a7) to head (f201d83).
⚠️ Report is 142 commits behind head on main.
Files with missing linesPatch %Lines
src/compile_cache.cc75.60%5 Missing and 5 partials ⚠️
src/env.cc50.00%1 Missing and 3 partials ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #65302 +/- ##
==========================================
- Coverage 90.32% 90.13% -0.19% 
==========================================
Files 751 751 Lines 249960 252344 +2384 Branches 47204 47452 +248 ==========================================
+ Hits 225774 227448 +1674 - Misses 15564 16193 +629 - Partials 8622 8703 +81 
Files with missing linesCoverage Δ
lib/internal/modules/helpers.js98.94% <100.00%> (+<0.01%)⬆️
src/compile_cache.h100.00% <100.00%> (ø)
src/node_modules.cc80.22% <100.00%> (-0.01%)⬇️
src/env.cc85.24% <50.00%> (-0.18%)⬇️
src/compile_cache.cc79.94% <75.60%> (+0.85%)⬆️
... and 119 files with indirect coverage changes
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----------------------------------- PR info ------------------------------------
Title module: add a read-only mode to the compile cache (#65302)
Author Shelley Vohr <shelley.vohr@gmail.com> (@codebytere)
Branch codebytere:compile-cache-read-only -> nodejs:main
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- module: add a read-only mode to the compile cache
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- Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/65302
Reviewed-By: James M Snell <jasnell@gmail.com>
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@aduh95 PTAL when you have a moment!
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Comment threadsrc/compile_cache.cc

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 if (!is_dir) {
 result.message =
 "Cache directory does not exist (read-only): " + cache_dir_with_tag;
 result.status = CompileCacheEnableStatus::FAILED;
 return result;
 }
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Should this emit a warning?
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i don't think so, for consistency: none of the other FAILED paths here (can't create the directory, not writable) warn either. through module.enableCompileCache() the caller gets { status, message } back and can decide what to do with it, and for NODE_COMPILE_CACHE the existing behavior is an inherited env var never adds output to a program that didn't ask for the cache; NODE_DEBUG_NATIVE=COMPILE_CACHE prints it. happy to add one if you feel strongly, but i'd rather do it for all the FAILED cases at once in a follow-up than special-case read-only.
@codebytere
module: add a read-only mode to the compile cache
f201d83
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
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module: add a read-only mode to the compile cache
94de25a
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
aduh95 pushed a commit
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Aug 25, 2026
@codebytere@aduh95
module: add a read-only mode to the compile cache
97a437e
A compile cache generated ahead of time and shipped inside an
application package should only ever be read: the package may be
immutable or covered by an integrity check, and a cache directory that
appears at run time would be a surprise. Add readOnly to
module.enableCompileCache() and NODE_COMPILE_CACHE_READONLY=1: existing
entries are loaded as before, nothing is serialized or persisted,
flushCompileCache() is a no-op, and the cache directory is used as found
rather than created, so enabling against a missing directory fails
instead of making one.
Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #65302
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
@github-actionsgithub-actionsBot
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