Introduce ES2025 target & Add missing ScriptTargetFeatures #63046

petamoriken · 2026-01-24T19:32:06Z

Fixes #61735

This PR includes the addition of 2 type files:

es2025.regexp.d.ts
es2025.intl.d.ts

Related issues and (stalled) PRs

ES2025 `RegExp.escape` (es2025.regexp.d.ts)

Closes #61321
Closes #62138

ES2025 `Intl.DurationFormat` (es2025.intl.d.ts)

Closes #60608
Closes #60646

typescript-bot · 2026-01-24T19:32:17Z

Thanks for the PR! It looks like you've changed the TSServer protocol in some way. Please ensure that any changes here don't break consumers of the current TSServer API. For some extra review, we'll ping @sheetalkamat, @mjbvz, and @joj for you. Feel free to loop in other consumers/maintainers if necessary.

typescript-bot · 2026-01-24T19:32:19Z

Looks like you're introducing a change to the public API surface area. If this includes breaking changes, please document them on our wiki's API Breaking Changes page.

Also, please make sure @DanielRosenwasser and @RyanCavanaugh are aware of the changes, just as a heads up.

pluma · 2026-01-28T18:49:17Z

Can we please get this reviewed? I know the country is burning and everyone is being replaced by AI but this would be really useful for those of us who deal with audiences across different languages.

jakebailey · 2026-01-28T21:07:57Z

We have a lot of these lib related PRs; it's absolutely our intention to review all of them as soon as we can, we've just had a bunch of other stuff that has been a bit more pressing.

jakebailey · 2026-01-28T21:09:40Z

I will note that an all-up PR for this may not be as useful as us reviewing the individual esnext PRs and then having a dedicated ES2025 PR; them being mixed together in this PR is making it hard to figure out what's new and what's just moving around. I would have preferred that the other PRs not be closed and this PR be a pure move + define options.

petamoriken · 2026-01-28T21:24:58Z

Only two files were newly added: es2025.intl.d.ts and es2025.regexp.d.ts.

I created this combined PR because the individual "esnext" PRs for these features had stalled, and there had been no progress. I wanted to take over the tasks myself, and since there are only two added files, I thought the review would not be too difficult.

@jakebailey If you still prefer to have them separated, I can create two individual PRs instead. What do you think?

Co-authored-by: lionel-rowe <lionel.rowe@gmail.com>

Co-authored-by: 김상두 <puki4416@gmail.com>

petamoriken · 2026-02-01T12:22:29Z

@jakebailey For now, I can remove the additions of es2025.intl.d.ts and es2025.regexp.d.ts from this PR, but should I do so? Please let me know your thoughts.

jakebailey · 2026-02-04T19:11:03Z

@typescript-bot test it

typescript-bot · 2026-02-04T19:11:08Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`test top400`	✅ Started
`user test this`	✅ Started	✅ Results
`run dt`	✅ Started	✅ Results
`perf test this faster`	✅ Started	👀 Results

jakebailey · 2026-02-04T19:15:36Z

.../reference/tsbuild/commandLine/multiFile/different-options-with-incremental-discrepancies.js

 {
  "fileInfos": {
-    "../../tslibs/ts/lib/lib.es2024.full.d.ts": {
+    "../../tslibs/ts/lib/lib.d.ts": {


I am not sure why this is changing not to 2025...

jakebailey · 2026-02-04T19:27:09Z

This PR looks largely correct, though I am confused by some of the test baseline changes.

I think it might be fine to take this first and then fix the other lib updates depending on what's in ES2025.

jakebailey · 2026-02-04T19:27:34Z

src/compiler/commandLineParser.ts

+    ["esnext.array", "lib.esnext.array.d.ts"],
+    ["esnext.decorators", "lib.esnext.decorators.d.ts"],
+    ["esnext.disposable", "lib.esnext.disposable.d.ts"],
    ["esnext.error", "lib.esnext.error.d.ts"],
+    ["esnext.intl", "lib.esnext.intl.d.ts"],
    ["esnext.sharedmemory", "lib.esnext.sharedmemory.d.ts"],
+    ["esnext.typedarrays", "lib.esnext.typedarrays.d.ts"],


Are none of these applicable to ES2025?

typescript-bot · 2026-02-04T19:30:49Z

@jakebailey Here are the results of running the user tests with tsc comparing main and refs/pull/63046/merge:

There were infrastructure failures potentially unrelated to your change:

1 instance of "Package install failed"
1 instance of "Git clone failed"

Otherwise...

Everything looks good!

typescript-bot · 2026-02-04T19:33:24Z

Hey @jakebailey, the results of running the DT tests are ready.

Everything looks the same!

You can check the log here.

typescript-bot · 2026-02-04T20:09:44Z

@jakebailey
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - node (v18.15.0, x64)}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_82,521	_82,521	_~	_~	_~	_{p=1.000 n=6}
_Types	_125,280	_125,280	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{277,740k (± 0.05%)}	_{277,723k (± 0.05%)}	_~	_277,507k	_277,940k	_{p=0.936 n=6}
_{Parse Time}	_{1.62s (± 0.85%)}	_{1.61s (± 0.64%)}	_~	_1.60s	_1.62s	_{p=0.271 n=6}
_{Bind Time}	_{0.92s (± 1.15%)}	_{0.92s (± 1.32%)}	_~	_0.90s	_0.93s	_{p=0.868 n=6}
_{Check Time}	_{17.52s (± 1.54%)}	_{17.41s (± 1.58%)}	_~	_17.04s	_17.80s	_{p=0.470 n=6}
_{Emit Time}	_{3.38s (± 8.68%)}	_{3.31s (± 4.47%)}	_~	_3.23s	_3.61s	_{p=0.936 n=6}
_{Total Time}	_{23.43s (± 1.77%)}	_{23.25s (± 1.12%)}	_~	_22.82s	_23.60s	_{p=0.378 n=6}
_{angular-1 - node (v18.15.0, x64)}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_955,823	_955,823	_~	_~	_~	_{p=1.000 n=6}
_Types	_415,853	_415,853	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{1,254,942k (± 0.01%)}	_{1,255,013k (± 0.00%)}	_{+71k (+ 0.01%)}	_1,254,900k	_1,255,065k	_{p=0.037 n=6}
_{Parse Time}	_{7.95s (± 0.69%)}	_{7.96s (± 0.78%)}	_~	_7.86s	_8.05s	_{p=0.807 n=6}
_{Bind Time}	_{2.38s (± 0.58%)}	_{2.38s (± 0.65%)}	_~	_2.35s	_2.39s	_{p=0.491 n=6}
_{Check Time}	_{38.75s (± 0.19%)}	_{38.78s (± 0.15%)}	_~	_38.73s	_38.87s	_{p=0.630 n=6}
_{Emit Time}	_{17.81s (± 0.93%)}	_{17.94s (± 0.45%)}	_~	_17.82s	_18.04s	_{p=0.148 n=6}
_{Total Time}	_{66.89s (± 0.21%)}	_{67.06s (± 0.22%)}	_~	_66.91s	_67.29s	_{p=0.109 n=6}
_{mui-docs - node (v18.15.0, x64)}
_Errors	_11,439	_11,439	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_2,701,943	_2,701,943	_~	_~	_~	_{p=1.000 n=6}
_Types	_930,574	_930,574	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,038,562k (± 0.00%)}	_{3,038,517k (± 0.00%)}	_~	_3,038,449k	_3,038,583k	_{p=0.575 n=6}
_{Parse Time}	_{10.32s (± 0.36%)}	_{10.33s (± 0.35%)}	_~	_10.29s	_10.39s	_{p=1.000 n=6}
_{Bind Time}	_{2.79s (± 0.75%)}	_{2.80s (± 0.66%)}	_~	_2.79s	_2.84s	_{p=0.084 n=6}
_{Check Time}	_{110.79s (± 0.40%)}	_{110.99s (± 0.42%)}	_~	_110.56s	_111.65s	_{p=0.230 n=6}
_{Emit Time}	_{0.40s (± 3.49%)}	_{0.39s (± 1.62%)}	_~	_0.38s	_0.40s	_{p=0.614 n=6}
_{Total Time}	_{124.30s (± 0.35%)}	_{124.52s (± 0.37%)}	_~	_124.09s	_125.18s	_{p=0.229 n=6}
_{self-build-src - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,252,546	_1,252,643	_{+97 (+ 0.01%)}	_~	_~	_{p=0.001 n=6}
_Types	_259,934	_260,012	_{+78 (+ 0.03%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{2,787,088k (±13.46%)}	_{3,004,730k (± 9.90%)}	_~	_2,397,096k	_3,126,896k	_{p=0.378 n=6}
_{Parse Time}	_{8.12s (± 1.27%)}	_{8.22s (± 1.46%)}	_~	_7.98s	_8.32s	_{p=0.230 n=6}
_{Bind Time}	_{2.72s (± 1.70%)}	_{2.74s (± 1.12%)}	_~	_2.69s	_2.77s	_{p=0.378 n=6}
_{Check Time}	_{52.97s (± 0.59%)}	_{53.02s (± 0.62%)}	_~	_52.46s	_53.36s	_{p=0.689 n=6}
_{Emit Time}	_{4.40s (± 4.30%)}	_{4.37s (± 1.98%)}	_~	_4.27s	_4.52s	_{p=0.936 n=6}
_{Total Time}	_{68.22s (± 0.60%)}	_{68.37s (± 0.56%)}	_~	_67.72s	_68.77s	_{p=0.575 n=6}
_{self-build-src-public-api - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,252,546	_1,252,643	_{+97 (+ 0.01%)}	_~	_~	_{p=0.001 n=6}
_Types	_259,934	_260,012	_{+78 (+ 0.03%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{3,189,422k (± 0.02%)}	_{3,069,104k (± 9.65%)}	_~	_2,464,128k	_3,190,451k	_{p=0.298 n=6}
_{Parse Time}	_{6.79s (± 0.89%)}	_{6.75s (± 0.96%)}	_~	_6.64s	_6.81s	_{p=0.336 n=6}
_{Bind Time}	_{2.23s (± 1.57%)}	_{2.25s (± 1.33%)}	_~	_2.21s	_2.29s	_{p=0.294 n=6}
_{Check Time}	_{42.98s (± 0.35%)}	_{42.88s (± 0.43%)}	_~	_42.55s	_43.07s	_{p=0.471 n=6}
_{Emit Time}	_{3.54s (± 2.06%)}	_{3.50s (± 1.97%)}	_~	_3.42s	_3.62s	_{p=0.297 n=6}
_{Total Time}	_{55.54s (± 0.45%)}	_{55.37s (± 0.47%)}	_~	_54.95s	_55.74s	_{p=0.378 n=6}
_{self-compiler - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_264,633	_264,712	_{+79 (+ 0.03%)}	_~	_~	_{p=0.001 n=6}
_Types	_104,072	_104,135	_{+63 (+ 0.06%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{443,584k (± 0.01%)}	_{443,589k (± 0.02%)}	_~	_443,474k	_443,694k	_{p=0.810 n=6}
_{Parse Time}	_{3.53s (± 0.33%)}	_{3.51s (± 1.05%)}	_~	_3.45s	_3.55s	_{p=0.325 n=6}
_{Bind Time}	_{1.38s (± 1.36%)}	_{1.38s (± 1.76%)}	_~	_1.33s	_1.40s	_{p=0.802 n=6}
_{Check Time}	_{19.16s (± 0.39%)}	_{19.16s (± 0.39%)}	_~	_19.06s	_19.23s	_{p=0.936 n=6}
_{Emit Time}	_{1.54s (± 1.32%)}	_{1.53s (± 0.76%)}	_~	_1.52s	_1.55s	_{p=0.220 n=6}
_{Total Time}	_{25.61s (± 0.27%)}	_{25.57s (± 0.31%)}	_~	_25.44s	_25.64s	_{p=0.574 n=6}
_{ts-pre-modules - node (v18.15.0, x64)}
_Errors	₂₇₁	₂₇₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_225,118	_225,118	_~	_~	_~	_{p=1.000 n=6}
_Types	_93,554	_93,554	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{370,348k (± 0.01%)}	_{370,367k (± 0.02%)}	_~	_370,281k	_370,441k	_{p=0.575 n=6}
_{Parse Time}	_{2.27s (± 0.91%)}	_{2.28s (± 0.48%)}	_~	_2.27s	_2.30s	_{p=0.244 n=6}
_{Bind Time}	_{1.40s (± 0.45%)}	_{1.40s (± 0.54%)}	_~	_1.39s	_1.41s	_{p=0.718 n=6}
_{Check Time}	_{14.47s (± 0.36%)}	_{14.42s (± 0.22%)}	_~	_14.38s	_14.46s	_{p=0.172 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{18.14s (± 0.29%)}	_{18.11s (± 0.18%)}	_~	_18.06s	_18.14s	_{p=0.466 n=6}
_{vscode - node (v18.15.0, x64)}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_4,204,969	_4,204,969	_~	_~	_~	_{p=1.000 n=6}
_Types	_1,333,293	_1,333,293	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,999,025k (± 0.01%)}	_{3,999,083k (± 0.00%)}	_~	_3,998,848k	_3,999,353k	_{p=0.936 n=6}
_{Parse Time}	_{16.25s (± 0.24%)}	_{16.10s (± 0.36%)}	_{-0.15s (- 0.92%)}	_16.06s	_16.21s	_{p=0.008 n=6}
_{Bind Time}	_{5.50s (± 2.06%)}	_{5.63s (± 3.45%)}	_~	_5.43s	_5.88s	_{p=0.198 n=6}
_{Check Time}	_{118.03s (± 3.81%)}	_{118.93s (± 3.59%)}	_~	_114.02s	_123.34s	_{p=1.000 n=6}
_{Emit Time}	_{56.01s (± 8.02%)}	_{56.79s (± 9.46%)}	_~	_50.69s	_64.68s	_{p=0.873 n=6}
_{Total Time}	_{195.80s (± 3.41%)}	_{197.46s (± 4.23%)}	_~	_187.04s	_208.49s	_{p=0.810 n=6}
_{webpack - node (v18.15.0, x64)}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_397,641	_397,641	_~	_~	_~	_{p=1.000 n=6}
_Types	_175,874	_175,874	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{551,390k (± 0.04%)}	_{551,383k (± 0.05%)}	_~	_550,960k	_551,723k	_{p=0.810 n=6}
_{Parse Time}	_{4.70s (± 0.91%)}	_{4.69s (± 0.67%)}	_~	_4.66s	_4.74s	_{p=0.376 n=6}
_{Bind Time}	_{2.00s (± 1.35%)}	_{1.99s (± 0.75%)}	_~	_1.98s	_2.02s	_{p=0.628 n=6}
_{Check Time}	_{23.98s (± 1.54%)}	_{24.01s (± 1.95%)}	_~	_23.25s	_24.38s	_{p=0.575 n=6}
_{Emit Time}	_{0.00s (±244.70%)}	_{0.00s (±154.76%)}	_~	_0.00s	_0.01s	_{p=0.595 n=6}
_{Total Time}	_{30.69s (± 1.31%)}	_{30.70s (± 1.59%)}	_~	_29.92s	_31.13s	_{p=0.810 n=6}
_{xstate-main - node (v18.15.0, x64)}
_Errors	₃₀	₃₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_731,941	_732,039	_{+98 (+ 0.01%)}	_~	_~	_{p=0.001 n=6}
_Types	_219,279	_219,279	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{635,874k (± 0.01%)}	_{635,992k (± 0.01%)}	_{+118k (+ 0.02%)}	_635,906k	_636,044k	_{p=0.013 n=6}
_{Parse Time}	_{3.70s (± 0.33%)}	_{3.71s (± 0.33%)}	_{+0.02s (+ 0.50%)}	_3.70s	_3.73s	_{p=0.042 n=6}
_{Bind Time}	_{1.26s (± 0.32%)}	_{1.26s (± 0.41%)}	_~	_1.26s	_1.27s	_{p=0.595 n=6}
_{Check Time}	_{18.49s (± 0.68%)}	_{18.39s (± 0.34%)}	_~	_18.30s	_18.47s	_{p=0.199 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{23.45s (± 0.49%)}	_{23.37s (± 0.26%)}	_~	_23.27s	_23.44s	_{p=0.336 n=6}

System info unknown

Hosts

node (v18.15.0, x64)

Scenarios

Compiler-Unions - node (v18.15.0, x64)
angular-1 - node (v18.15.0, x64)
mui-docs - node (v18.15.0, x64)
self-build-src - node (v18.15.0, x64)
self-build-src-public-api - node (v18.15.0, x64)
self-compiler - node (v18.15.0, x64)
ts-pre-modules - node (v18.15.0, x64)
vscode - node (v18.15.0, x64)
webpack - node (v18.15.0, x64)
xstate-main - node (v18.15.0, x64)

_Benchmark	_Name	_Iterations
_Current	_pr	₆
_Baseline	_baseline	₆

Developer Information:

Download Benchmarks

github-project-automation bot added this to PR Backlog Jan 24, 2026

github-project-automation bot moved this to Not started in PR Backlog Jan 24, 2026

typescript-bot added the For Backlog Bug PRs that fix a backlog bug label Jan 24, 2026

petamoriken changed the title ~~Introduce ES2025 target~~ Introduce ES2025 target & Add missing ScriptTargetFeatures Jan 24, 2026

petamoriken and others added 8 commits January 29, 2026 06:43

feat: Add ES2025 target

1f00226

fix: Add missing ScriptTargetFeatures

7c48e79

Add type for ES2025 RegExp.escape

f69d5ad

Co-authored-by: lionel-rowe <lionel.rowe@gmail.com>

Add type for ES2025 Intl.DurationFormat

bb08b4c

Co-authored-by: 김상두 <puki4416@gmail.com>

baseline

82d7c65

Tweak

f9ec910

typo

2003118

baseline

86c687a

petamoriken force-pushed the feat/es2025-target branch from 9d68792 to 86c687a Compare January 28, 2026 21:46

petamoriken added 4 commits January 29, 2026 06:52

remove "/en-US" from MDN URL

e86a117

Merge branch 'main' into feat/es2025-target

3ff5b2f

update ScriptTarget.LatestStandard to ES2025

57b8b0e

baseline

06350b4

petamoriken added 2 commits February 4, 2026 04:16

Merge branch 'main' into feat/es2025-target

4c718cd

Merge branch 'main' into feat/es2025-target

a684da6

petamoriken mentioned this pull request Feb 4, 2026

TypeScript 6.0 Iteration Plan #63085

Open

jakebailey reviewed Feb 4, 2026

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Introduce ES2025 target & Add missing ScriptTargetFeatures #63046

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Introduce ES2025 target & Add missing ScriptTargetFeatures #63046

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Related issues and (stalled) PRs

ES2025 RegExp.escape (es2025.regexp.d.ts)

ES2025 Intl.DurationFormat (es2025.intl.d.ts)

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petamoriken commented Jan 24, 2026 •

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ES2025 `RegExp.escape` (es2025.regexp.d.ts)

ES2025 `Intl.DurationFormat` (es2025.intl.d.ts)

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