lib: use Object.freeze to avoid defensive cloning in SourceMap by watilde · Pull Request #62830 · nodejs/node

watilde · 2026-04-19T10:37:36Z

No description provided.

codecov · 2026-04-19T11:58:49Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.65%. Comparing base (d44a71a) to head (673e0a2).
⚠️ Report is 264 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62830      +/-   ##
==========================================
+ Coverage   89.61%   89.65%   +0.03%     
==========================================
  Files         706      706              
  Lines      219203   219389     +186     
  Branches    41995    42061      +66     
==========================================
+ Hits       196445   196692     +247     
+ Misses      14663    14589      -74     
- Partials     8095     8108      +13

Files with missing lines	Coverage Δ
lib/internal/source_map/source_map.js	`99.48% <100.00%> (+0.25%)`	⬆️

... and 49 files with indirect coverage changes

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legendecas

Would you mind adding a note on https://github.com/nodejs/node/blob/main/doc/api/module.md#sourcemappayload that the returned payload is frozen? Thanks!

legendecas

Would you mind fixing the linter complaints? Thanks

watilde · 2026-04-23T11:09:03Z

Fix, rebase and make the commit Verified.

Co-authored-by: Chengzhong Wu <legendecas@gmail.com>

nodejs-github-bot · 2026-04-25T16:24:18Z

CI: https://ci.nodejs.org/job/node-test-pull-request/72922/

nodejs-github-bot · 2026-05-19T14:32:59Z

Commit Queue failed

- Loading data for nodejs/node/pull/62830
✔  Done loading data for nodejs/node/pull/62830
----------------------------------- PR info ------------------------------------
Title      lib: use Object.freeze to avoid defensive cloning in SourceMap (#62830)
Author     Daijiro Wachi <daijiro.wachi@gmail.com> (@watilde)
Branch     watilde:fixes-memory-sourcemap -> nodejs:main
Labels     semver-major, author ready, source maps, commit-queue-squash
Commits    4
 - lib: use Object.freeze to avoid defensive cloning in SourceMap
 - doc: clarify sourceMap.payload behavior and immutability
 - doc: add change metadata for validator message
 - doc: fix unclosed YAML comment in sourceMap.payload
Committers 2
 - Daijiro Wachi <daijiro.wachi@gmail.com>
 - GitHub <noreply@github.com>
PR-URL: https://github.com/nodejs/node/pull/62830
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/62830
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
--------------------------------------------------------------------------------
   ℹ  This PR was created on Sun, 19 Apr 2026 10:37:36 GMT
   ✔  Approvals: 1
   ✔  - Chengzhong Wu (@legendecas) (TSC): https://github.com/nodejs/node/pull/62830#pullrequestreview-4175823264
   ✘  semver-major requires at least 2 TSC approvals
   ✔  Last GitHub CI successful
   ℹ  Last Full PR CI on 2026-04-25T16:24:18Z: https://ci.nodejs.org/job/node-test-pull-request/72922/
- Querying data for job/node-test-pull-request/72922/
✔  Build data downloaded
   ✔  Last Jenkins CI successful
--------------------------------------------------------------------------------
   ✔  Aborted `git node land` session in /home/runner/work/node/node/.ncu

https://github.com/nodejs/node/actions/runs/26103949075

legendecas · 2026-05-19T15:08:47Z

Given that this is a breaking change, this needs another @nodejs/tsc review, thanks!

nodejs-github-bot · 2026-05-19T17:49:08Z

Commit Queue failed

- Loading data for nodejs/node/pull/62830 ✔ Done loading data for nodejs/node/pull/62830 ----------------------------------- PR info ------------------------------------ Title lib: use Object.freeze to avoid defensive cloning in SourceMap (#62830) Author Daijiro Wachi <daijiro.wachi@gmail.com> (@watilde) Branch watilde:fixes-memory-sourcemap -> nodejs:main Labels semver-major, author ready, source maps, commit-queue-squash Commits 4 - lib: use Object.freeze to avoid defensive cloning in SourceMap - doc: clarify sourceMap.payload behavior and immutability - doc: add change metadata for validator message - doc: fix unclosed YAML comment in sourceMap.payload Committers 2 - Daijiro Wachi <daijiro.wachi@gmail.com> - GitHub <noreply@github.com> PR-URL: https://github.com/nodejs/node/pull/62830 Reviewed-By: Chengzhong Wu <legendecas@gmail.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> ------------------------------ Generated metadata ------------------------------ PR-URL: https://github.com/nodejs/node/pull/62830 Reviewed-By: Chengzhong Wu <legendecas@gmail.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> -------------------------------------------------------------------------------- ℹ This PR was created on Sun, 19 Apr 2026 10:37:36 GMT ✔ Approvals: 2 ✔ - Chengzhong Wu (@legendecas) (TSC): https://github.com/nodejs/node/pull/62830#pullrequestreview-4175823264 ✔ - Yagiz Nizipli (@anonrig) (TSC): https://github.com/nodejs/node/pull/62830#pullrequestreview-4320305018 ✔ Last GitHub CI successful ℹ Last Full PR CI on 2026-05-19T14:32:59Z: https://ci.nodejs.org/job/node-test-pull-request/72922/ - Querying data for job/node-test-pull-request/72922/ ✔ Build data downloaded ✔ Last Jenkins CI successful -------------------------------------------------------------------------------- ✔ No git cherry-pick in progress ✔ No git am in progress ✔ No git rebase in progress -------------------------------------------------------------------------------- - Bringing origin/main up to date... From https://github.com/nodejs/node * branch main -> FETCH_HEAD ✔ origin/main is now up-to-date - Downloading patch for 62830 From https://github.com/nodejs/node * branch refs/pull/62830/merge -> FETCH_HEAD ✔ Fetched commits as 783b38248310..673e0a2285e9 -------------------------------------------------------------------------------- [main 69cf5e6625] lib: use Object.freeze to avoid defensive cloning in SourceMap Author: Daijiro Wachi <daijiro.wachi@gmail.com> Date: Sun Apr 19 19:40:37 2026 +0900 2 files changed, 19 insertions(+), 8 deletions(-) Auto-merging doc/api/module.md [main 9ca29e4b19] doc: clarify sourceMap.payload behavior and immutability Author: Daijiro Wachi <daijiro.wachi@gmail.com> Date: Thu Apr 23 19:36:22 2026 +0900 1 file changed, 4 insertions(+) Auto-merging doc/api/module.md [main 7b0a139518] doc: add change metadata for validator message Author: Daijiro Wachi <daijiro.wachi@gmail.com> Date: Fri Apr 24 02:52:24 2026 +0900 1 file changed, 5 insertions(+) Auto-merging doc/api/module.md [main 4251de19a1] doc: fix unclosed YAML comment in sourceMap.payload Author: Daijiro Wachi <daijiro.wachi@gmail.com> Date: Sat Apr 25 18:32:39 2026 +0900 1 file changed, 2 insertions(+) ✔ Patches applied There are 4 commits in the PR. Attempting to fixup everything into first commit. [main 1bd0ca9117] lib: use Object.freeze to avoid defensive cloning in SourceMap Author: Daijiro Wachi <daijiro.wachi@gmail.com> Date: Sun Apr 19 19:40:37 2026 +0900 3 files changed, 30 insertions(+), 8 deletions(-) --------------------------------- New Message ---------------------------------- lib: use Object.freeze to avoid defensive cloning in SourceMap

PR-URL: #62830
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

[main c2e25ee445] lib: use Object.freeze to avoid defensive cloning in SourceMap
Author: Daijiro Wachi <daijiro.wachi@gmail.com>
Date: Sun Apr 19 19:40:37 2026 +0900
3 files changed, 30 insertions(+), 8 deletions(-)
✖ c2e25ee4458f66a963f8dfaa3f456d6744cdf674
✔ 0:0 no Assisted-by metadata assisted-by-is-trailer
✔ 0:0 no Co-authored-by metadata co-authored-by-is-trailer
✔ 0:0 skipping fixes-url fixes-url
✔ 0:0 blank line after title line-after-title
✔ 0:0 line-lengths are valid line-length
✔ 0:0 metadata is at end of message metadata-end
✔ 1:8 PR-URL is valid. pr-url
✔ 0:0 reviewers are valid reviewers
✖ 0:0 Commit must have a "Signed-off-by" trailer signed-off-by
✔ 0:0 valid subsystems subsystem
✔ 0:0 Title is formatted correctly. title-format
⚠ 0:50 Title should be <= 50 columns. title-length

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https://github.com/nodejs/node/actions/runs/26114797253

aduh95 · 2026-05-19T18:30:54Z

Landed in b1387e6

Notable changes: async_hooks: * (SEMVER-MAJOR) remove legacy AsyncLocalStorage implementation (Matteo Collina) #63641 benchmark: * (SEMVER-MAJOR) protect against accidental fork bomb (James M Snell) #66132 build: * (SEMVER-MAJOR) remove the bundled FIPS provider build (Filip Skokan) #64777 * (SEMVER-MAJOR) require OpenSSL 3 or later (Filip Skokan) #64777 * (SEMVER-MAJOR) downgrade Intel macOS support to experimental (Antoine du Hamel) #65427 crypto: * (SEMVER-MAJOR) move DEP0093 to End-of-Life (Filip Skokan) #64777 * (SEMVER-MAJOR) remove legacy OpenSSL code paths (Filip Skokan) #64777 * (SEMVER-MAJOR) validate digest output encodings (Filip Skokan) #66247 * (SEMVER-MAJOR) validate update input encodings (Filip Skokan) #66247 * (SEMVER-MAJOR) validate inputEncoding in Cipher/Decipher update (Maruthan G) #66247 * (SEMVER-MAJOR) move DEP0198 to End-of-Life (Filip Skokan) #64000 * (SEMVER-MAJOR) move DEP0203 and DEP0204 to End-of-Life (Filip Skokan) #63188 * (SEMVER-MAJOR) reject resizable backing stores in Web Crypto buffer parameters (Filip Skokan) #63925 * (SEMVER-MAJOR) throw on uninitialized DH computeSecret (Filip Skokan) #63922 * (SEMVER-MAJOR) runtime-deprecate calling Hmac.digest() more than once (Madelyn) #63624 crypto,https,tls: * (SEMVER-MAJOR) end OpenSSL engine support (Filip Skokan) #64777 deps: * (SEMVER-MAJOR) update archs files for openssl-4.1.0 (Node.js GitHub Bot) #66971 * (SEMVER-MAJOR) upgrade openssl sources to openssl-4.1.0 (Node.js GitHub Bot) #66971 * (SEMVER-MAJOR) remove ncrypto legacy OpenSSL backend (Filip Skokan) #64777 * (SEMVER-MAJOR) update V8 to 15.6.75.13 (Joyee Cheung) #66601 * (SEMVER-MAJOR) update V8 to 15.5.35.20 (Joyee Cheung) #66537 * (SEMVER-MAJOR) update V8 to 15.2.124.38 (Joyee Cheung) #65161 * (SEMVER-MAJOR) upgrade npm to 12.1.0 (npm team) #66212 dgram: * (SEMVER-MAJOR) skip the custom lookup for literal IP addresses (Ruben Bridgewater) #64131 dns: * (SEMVER-MAJOR) do not consult hosts file in reverse lookups (Archkon) #64268 * (SEMVER-MAJOR) stop using deprecated functions in `SetServers` (Antoine du Hamel) #64356 doc: * (SEMVER-MAJOR) remove OpenSSL 1.x references (Filip Skokan) #64777 * (SEMVER-MAJOR) update Node.js 27 official binary toolchains (Richard Lau) #66377 domain: * (SEMVER-MAJOR) runtime-deprecate the module (Matteo Collina) #65074 * (SEMVER-MAJOR) port to AsyncLocalStorage (Matteo Collina) #61095 fs: * (SEMVER-MAJOR) implement glob natively (Aviv Keller) #65392 * (SEMVER-MAJOR) return Buffer from mkdtemp when prefix is a Buffer (Hamid Reza Ghavami) #64397 http: * (SEMVER-MAJOR) reject responses exceeding header limit (Matteo Collina) #65010 * (SEMVER-MAJOR) runtime deprecate instantiating without new (Yagiz Nizipli) #64853 * (SEMVER-MAJOR) increase keepAliveTimeout default to 65 seconds (Tim Perry) #62782 * (SEMVER-MAJOR) make req.headers have a null prototype (Matteo Collina) #62900 * (SEMVER-MAJOR) reject addTrailers after finish (Ryuhei Shima) #62832 http2: * (SEMVER-MAJOR) increase default window sizes (Matteo Collina) #64623 lib: * (SEMVER-MAJOR) deprecate _http_* (Sebastian Beltran) #58535 * (SEMVER-MAJOR) insert argv[0] at argv[1] in setDeserializeMainFunction (Daijiro Wachi) #62928 * (SEMVER-MAJOR) use `Object.freeze` to avoid defensive cloning in `SourceMap` (Daijiro Wachi) #62830 * (SEMVER-MAJOR) reject SharedArrayBuffer in Blob constructor per spec (Ali Hassan) #63046 lib,src: * (SEMVER-MAJOR) remove `--no-experimental-websocket` CLI flag (Antoine du Hamel) #65284 net: * (SEMVER-MAJOR) race family autoselection attempts (Matteo Collina) #66229 * (SEMVER-MAJOR) throw on multiple listen calls (Matteo Collina) #64871 * (SEMVER-MAJOR) runtime-deprecate Server.prototype._listen2 (Guilherme Araújo) #64794 * (SEMVER-MAJOR) add experimental net/promises API (Ethan Arrowood) #63965 repl: * (SEMVER-MAJOR) use inspector over vm (Aviv Keller) #64034 src: * (SEMVER-MAJOR) officially deprecate `node::ObjectWrap` (Anna Henningsen) #63756 * (SEMVER-MAJOR) merge `CreateEnvironment()` overloads (Anna Henningsen) #63596 src, test: src,lib: * (SEMVER-MAJOR) add --allow-env permission (James M Snell) #66132 stream: * (SEMVER-MAJOR) destroy source when map iterator closes early (Y1D7NG) #64264 test: * (SEMVER-MAJOR) fix fs write encoding coverage (Filip Skokan) #66247 test,benchmark: * (SEMVER-MAJOR) drop OpenSSL 1.x-only coverage (Filip Skokan) #64777 test,tools: * (SEMVER-MAJOR) drop OpenSSL 1.x-era FIPS leftovers (Filip Skokan) #64777 test_runner: * use AsyncLocalStorage instead of async_hooks (Matteo Collina) #66795 tls: * (SEMVER-MAJOR) move _tls_* to end-of-life (Sebastian Beltran) #60658 zlib: * (SEMVER-MAJOR) convert classes to modern syntax and eol DEP0184 (Yagiz Nizipli) #64849 PR-URL: #67062

Notable changes: build: * (SEMVER-MAJOR) remove the bundled FIPS provider build (Filip Skokan) #64777 * (SEMVER-MAJOR) require OpenSSL 3 or later (Filip Skokan) #64777 * (SEMVER-MAJOR) downgrade Intel macOS support to experimental (Antoine du Hamel) #65427 crypto: * (SEMVER-MAJOR) move DEP0093 to End-of-Life (Filip Skokan) #64777 * (SEMVER-MAJOR) remove legacy OpenSSL code paths (Filip Skokan) #64777 * (SEMVER-MAJOR) validate digest output encodings (Filip Skokan) #66247 * (SEMVER-MAJOR) validate update input encodings (Filip Skokan) #66247 * (SEMVER-MAJOR) validate inputEncoding in Cipher/Decipher update (Maruthan G) #66247 * (SEMVER-MAJOR) move DEP0198 to End-of-Life (Filip Skokan) #64000 * (SEMVER-MAJOR) move DEP0203 and DEP0204 to End-of-Life (Filip Skokan) #63188 * (SEMVER-MAJOR) reject resizable backing stores in Web Crypto buffer parameters (Filip Skokan) #63925 * (SEMVER-MAJOR) throw on uninitialized DH computeSecret (Filip Skokan) #63922 * (SEMVER-MAJOR) runtime-deprecate calling Hmac.digest() more than once (Madelyn) #63624 crypto,https,tls: * (SEMVER-MAJOR) end OpenSSL engine support (Filip Skokan) #64777 deps: * (SEMVER-MAJOR) update archs files for openssl-4.1.0 (Node.js GitHub Bot) #66971 * (SEMVER-MAJOR) upgrade openssl sources to openssl-4.1.0 (Node.js GitHub Bot) #66971 * (SEMVER-MAJOR) remove ncrypto legacy OpenSSL backend (Filip Skokan) #64777 * (SEMVER-MAJOR) update V8 to 15.6.75.13 (Joyee Cheung) #66601 * (SEMVER-MAJOR) upgrade npm to 12.1.0 (npm team) #66212 dgram: * (SEMVER-MAJOR) skip the custom lookup for literal IP addresses (Ruben Bridgewater) #64131 dns: * (SEMVER-MAJOR) do not consult hosts file in reverse lookups (Archkon) #64268 * (SEMVER-MAJOR) stop using deprecated functions in `SetServers` (Antoine du Hamel) #64356 doc: * (SEMVER-MAJOR) remove OpenSSL 1.x references (Filip Skokan) #64777 * (SEMVER-MAJOR) update Node.js 27 official binary toolchains (Richard Lau) #66377 domain: * (SEMVER-MAJOR) runtime-deprecate the module (Matteo Collina) #65074 * (SEMVER-MAJOR) port to AsyncLocalStorage (Matteo Collina) #61095 fs: * (SEMVER-MAJOR) implement glob natively (Aviv Keller) #65392 * (SEMVER-MAJOR) return Buffer from mkdtemp when prefix is a Buffer (Hamid Reza Ghavami) #64397 http: * (SEMVER-MAJOR) reject responses exceeding header limit (Matteo Collina) #65010 * (SEMVER-MAJOR) runtime deprecate instantiating without new (Yagiz Nizipli) #64853 * (SEMVER-MAJOR) increase keepAliveTimeout default to 65 seconds (Tim Perry) #62782 * (SEMVER-MAJOR) make req.headers have a null prototype (Matteo Collina) #62900 * (SEMVER-MAJOR) reject addTrailers after finish (Ryuhei Shima) #62832 http2: * (SEMVER-MAJOR) increase default window sizes (Matteo Collina) #64623 lib: * (SEMVER-MAJOR) deprecate _http_* (Sebastian Beltran) #58535 * (SEMVER-MAJOR) insert argv[0] at argv[1] in setDeserializeMainFunction (Daijiro Wachi) #62928 * (SEMVER-MAJOR) use `Object.freeze` to avoid defensive cloning in `SourceMap` (Daijiro Wachi) #62830 * (SEMVER-MAJOR) reject SharedArrayBuffer in Blob constructor per spec (Ali Hassan) #63046 lib,src: * (SEMVER-MAJOR) remove `--no-experimental-websocket` CLI flag (Antoine du Hamel) #65284 net: * (SEMVER-MAJOR) race family autoselection attempts (Matteo Collina) #66229 * (SEMVER-MAJOR) throw on multiple listen calls (Matteo Collina) #64871 * (SEMVER-MAJOR) runtime-deprecate Server.prototype._listen2 (Guilherme Araújo) #64794 * (SEMVER-MAJOR) add experimental net/promises API (Ethan Arrowood) #63965 repl: * (SEMVER-MAJOR) use inspector over vm (Aviv Keller) #64034 src: * (SEMVER-MAJOR) officially deprecate `node::ObjectWrap` (Anna Henningsen) #63756 * (SEMVER-MAJOR) merge `CreateEnvironment()` overloads (Anna Henningsen) #63596 src,lib: * (SEMVER-MAJOR) add --allow-env permission (James M Snell) #66132 stream: * (SEMVER-MAJOR) destroy source when map iterator closes early (Y1D7NG) #64264 test_runner: * use AsyncLocalStorage instead of async_hooks (Matteo Collina) #66795 tls: * (SEMVER-MAJOR) move _tls_* to end-of-life (Sebastian Beltran) #60658 zlib: * (SEMVER-MAJOR) convert classes to modern syntax and eol DEP0184 (Yagiz Nizipli) #64849 PR-URL: #67062

nodejs-github-bot added the needs-ci PRs that need a full CI run. label Apr 19, 2026

watilde force-pushed the fixes-memory-sourcemap branch from 3b8cc82 to 73ffd8a Compare April 19, 2026 10:40

watilde changed the title ~~perf: use Object.freeze to avoid defensive cloning in SourceMap~~ lib: use Object.freeze to avoid defensive cloning in SourceMap Apr 19, 2026

legendecas added semver-major PRs that contain breaking changes and should be released in the next major version. source maps Issues and PRs related to source map support. labels Apr 20, 2026

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watilde force-pushed the fixes-memory-sourcemap branch from bd11c1e to f5cc42f Compare April 23, 2026 10:36

watilde added 2 commits April 23, 2026 20:03

lib: use Object.freeze to avoid defensive cloning in SourceMap

7b33dfd

doc: clarify sourceMap.payload behavior and immutability

f493f69

watilde force-pushed the fixes-memory-sourcemap branch from f5cc42f to f493f69 Compare April 23, 2026 11:04

legendecas added the commit-queue-squash PRs the Commit Queue should land as one squashed commit. label Apr 23, 2026

doc: add change metadata for validator message

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Co-authored-by: Chengzhong Wu <legendecas@gmail.com>

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doc: fix unclosed YAML comment in sourceMap.payload

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aduh95 merged commit b1387e6 into nodejs:main May 19, 2026
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2026-10-28, Version 27.0.0-alpha.0.0.0 (Alpha) #67062

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lib: use Object.freeze to avoid defensive cloning in SourceMap - #62830

lib: use Object.freeze to avoid defensive cloning in SourceMap#62830
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PR-URL: #62830
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

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PR-URL: #62830 Reviewed-By: Chengzhong Wu <legendecas@gmail.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

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PR-URL: #62830
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>