Port microsoft/typescript-go#1764 by ahejlsberg · Pull Request #62510 · microsoft/TypeScript

ahejlsberg · 2025-09-29T20:09:33Z

Copilot

Pull Request Overview

This PR ports a change from the typescript-go repository that replaces direct object flag checking with a more appropriate type guard function call.

Replaces manual ObjectFlags.FreshLiteral flag checking with isObjectLiteralType() function call

ahejlsberg · 2025-09-29T20:10:49Z

@typescript-bot test it

typescript-bot · 2025-09-29T20:10:55Z

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

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

typescript-bot · 2025-09-29T20:34:51Z

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

Everything looks the same!

You can check the log here.

typescript-bot · 2025-09-29T20:38:25Z

@ahejlsberg Here are the results of running the user tests with tsc comparing main and refs/pull/62510/merge:

There were infrastructure failures potentially unrelated to your change:

1 instance of "Git clone failed"

Otherwise...

Everything looks good!

typescript-bot · 2025-09-29T20:59:36Z

@ahejlsberg
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	₃₄	₃₄	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_62,370	_62,370	_~	_~	_~	_{p=1.000 n=6}
_Types	_50,386	_50,386	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{193,380k (± 0.74%)}	_{193,984k (± 0.97%)}	_~	_192,758k	_196,464k	_{p=0.423 n=6}
_{Parse Time}	_{1.29s (± 0.90%)}	_{1.30s (± 0.84%)}	_~	_1.28s	_1.31s	_{p=0.246 n=6}
_{Bind Time}	_{0.72s (± 0.57%)}	_0.72s	_~	_~	_~	_{p=0.405 n=6}
_{Check Time}	_{9.76s (± 0.40%)}	_{9.74s (± 0.42%)}	_~	_9.70s	_9.80s	_{p=0.687 n=6}
_{Emit Time}	_{2.75s (± 0.42%)}	_{2.74s (± 0.99%)}	_~	_2.70s	_2.78s	_{p=0.286 n=6}
_{Total Time}	_{14.52s (± 0.28%)}	_{14.50s (± 0.49%)}	_~	_14.40s	_14.58s	_{p=0.687 n=6}
_{angular-1 - node (v18.15.0, x64)}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_948,914	_948,914	_~	_~	_~	_{p=1.000 n=6}
_Types	_410,884	_410,884	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{1,245,598k (± 0.00%)}	_{1,245,621k (± 0.00%)}	_~	_1,245,567k	_1,245,699k	_{p=0.873 n=6}
_{Parse Time}	_{6.51s (± 0.63%)}	_{6.47s (± 0.55%)}	_~	_6.43s	_6.52s	_{p=0.326 n=6}
_{Bind Time}	_{1.87s (± 0.79%)}	_{1.87s (± 0.40%)}	_~	_1.86s	_1.88s	_{p=1.000 n=6}
_{Check Time}	_{32.22s (± 0.48%)}	_{32.12s (± 0.35%)}	_~	_31.92s	_32.26s	_{p=0.173 n=6}
_{Emit Time}	_{14.77s (± 0.24%)}	_{14.79s (± 0.38%)}	_~	_14.75s	_14.90s	_{p=0.462 n=6}
_{Total Time}	_{55.36s (± 0.33%)}	_{55.25s (± 0.31%)}	_~	_55.00s	_55.52s	_{p=0.173 n=6}
_{mui-docs - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_2,544,632	_2,544,632	_~	_~	_~	_{p=1.000 n=6}
_Types	_903,208	_903,208	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{2,829,952k (± 0.00%)}	_{2,829,953k (± 0.01%)}	_~	_2,829,703k	_2,830,097k	_{p=0.936 n=6}
_{Parse Time}	_{8.73s (± 0.28%)}	_{8.74s (± 0.30%)}	_~	_8.71s	_8.78s	_{p=0.625 n=6}
_{Bind Time}	_{2.22s (± 0.44%)}	_{2.22s (± 0.23%)}	_~	_2.22s	_2.23s	_{p=0.348 n=6}
_{Check Time}	_{86.16s (± 0.50%)}	_{86.08s (± 0.72%)}	_~	_85.57s	_87.28s	_{p=0.298 n=6}
_{Emit Time}	_{0.63s (±124.75%)}	_{0.61s (±123.09%)}	_~	_0.30s	_2.15s	_{p=0.383 n=6}
_{Total Time}	_{97.74s (± 1.03%)}	_{97.65s (± 0.80%)}	_~	_96.87s	_98.74s	_{p=0.689 n=6}
_{self-build-src - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,237,063	_1,237,063	_~	_~	_~	_{p=1.000 n=6}
_Types	_259,743	_259,743	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{2,485,695k (± 7.55%)}	_{2,424,762k (± 6.11%)}	_~	_2,363,211k	_2,727,529k	_{p=0.575 n=6}
_{Parse Time}	_{5.17s (± 0.67%)}	_{5.13s (± 0.73%)}	_~	_5.10s	_5.20s	_{p=0.065 n=6}
_{Bind Time}	_{1.77s (± 0.66%)}	_{1.77s (± 0.87%)}	_~	_1.76s	_1.80s	_{p=1.000 n=6}
_{Check Time}	_{34.94s (± 0.62%)}	_{34.94s (± 0.42%)}	_~	_34.69s	_35.08s	_{p=0.810 n=6}
_{Emit Time}	_{3.00s (± 1.18%)}	_{3.05s (± 4.24%)}	_~	_2.95s	_3.31s	_{p=0.810 n=6}
_{Total Time}	_{44.87s (± 0.51%)}	_{44.91s (± 0.39%)}	_~	_44.62s	_45.16s	_{p=0.810 n=6}
_{self-build-src-public-api - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,237,063	_1,237,063	_~	_~	_~	_{p=1.000 n=6}
_Types	_259,743	_259,743	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,158,279k (± 0.02%)}	_{3,158,133k (± 0.02%)}	_~	_3,157,495k	_3,158,824k	_{p=0.471 n=6}
_{Parse Time}	_{6.86s (± 0.97%)}	_{6.86s (± 0.61%)}	_~	_6.80s	_6.91s	_{p=0.630 n=6}
_{Bind Time}	_{2.16s (± 0.81%)}	_{2.15s (± 0.42%)}	_~	_2.14s	_2.16s	_{p=0.089 n=6}
_{Check Time}	_{42.53s (± 0.19%)}	_{42.51s (± 0.46%)}	_~	_42.27s	_42.77s	_{p=0.936 n=6}
_{Emit Time}	_{3.45s (± 2.75%)}	_{3.51s (± 2.82%)}	_~	_3.36s	_3.66s	_{p=0.173 n=6}
_{Total Time}	_{55.01s (± 0.29%)}	_{55.06s (± 0.29%)}	_~	_54.92s	_55.36s	_{p=0.689 n=6}
_{self-compiler - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_262,411	_262,411	_~	_~	_~	_{p=1.000 n=6}
_Types	_103,924	_103,924	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{440,479k (± 0.01%)}	_{440,476k (± 0.01%)}	_~	_440,403k	_440,535k	_{p=0.810 n=6}
_{Parse Time}	_{3.51s (± 0.98%)}	_{3.51s (± 0.73%)}	_~	_3.47s	_3.54s	_{p=0.570 n=6}
_{Bind Time}	_{1.33s (± 1.03%)}	_{1.33s (± 0.82%)}	_~	_1.32s	_1.35s	_{p=0.365 n=6}
_{Check Time}	_{19.03s (± 0.08%)}	_{19.02s (± 0.34%)}	_~	_18.95s	_19.10s	_{p=1.000 n=6}
_{Emit Time}	_{1.54s (± 0.96%)}	_{1.53s (± 0.87%)}	_~	_1.51s	_1.55s	_{p=0.190 n=6}
_{Total Time}	_{25.41s (± 0.17%)}	_{25.40s (± 0.30%)}	_~	_25.30s	_25.51s	_{p=0.810 n=6}
_{ts-pre-modules - node (v18.15.0, x64)}
_Errors	₇₂	₇₂	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_225,367	_225,367	_~	_~	_~	_{p=1.000 n=6}
_Types	_94,290	_94,290	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{369,996k (± 0.04%)}	_{369,960k (± 0.02%)}	_~	_369,891k	_370,048k	_{p=0.936 n=6}
_{Parse Time}	_{2.84s (± 1.79%)}	_{2.83s (± 0.62%)}	_~	_2.82s	_2.86s	_{p=0.257 n=6}
_{Bind Time}	_{1.60s (± 0.92%)}	_{1.59s (± 0.92%)}	_~	_1.57s	_1.61s	_{p=0.289 n=6}
_{Check Time}	_{16.46s (± 0.29%)}	_{16.47s (± 0.25%)}	_~	_16.42s	_16.52s	_{p=0.629 n=6}
_{Emit Time}	_{0.00s (±244.70%)}	_0.00s	_~	_~	_~	_{p=0.405 n=6}
_{Total Time}	_{20.91s (± 0.43%)}	_{20.90s (± 0.22%)}	_~	_20.85s	_20.95s	_{p=0.935 n=6}
_{vscode - node (v18.15.0, x64)}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_3,896,281	_3,896,281	_~	_~	_~	_{p=1.000 n=6}
_Types	_1,225,516	_1,225,516	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,708,541k (± 0.00%)}	_{3,708,575k (± 0.00%)}	_~	_3,708,371k	_3,708,711k	_{p=0.470 n=6}
_{Parse Time}	_{15.30s (± 0.63%)}	_{15.24s (± 0.56%)}	_~	_15.11s	_15.32s	_{p=0.422 n=6}
_{Bind Time}	_{5.01s (± 3.08%)}	_{5.03s (± 2.93%)}	_~	_4.91s	_5.28s	_{p=0.575 n=6}
_{Check Time}	_{101.48s (± 1.75%)}	_{102.42s (± 3.08%)}	_~	_100.24s	_108.13s	_{p=0.298 n=6}
_{Emit Time}	_{32.24s (± 9.69%)}	_{33.80s (±19.70%)}	_~	_30.68s	_47.38s	_{p=1.000 n=6}
_{Total Time}	_{154.04s (± 2.89%)}	_{156.49s (± 5.16%)}	_~	_151.13s	_171.79s	_{p=0.575 n=6}
_{webpack - node (v18.15.0, x64)}
_Errors	₃₈	₃₈	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_361,947	_361,947	_~	_~	_~	_{p=1.000 n=6}
_Types	_158,950	_158,950	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{516,720k (± 0.01%)}	_{516,696k (± 0.02%)}	_~	_516,568k	_516,802k	_{p=0.810 n=6}
_{Parse Time}	_{4.45s (± 1.10%)}	_{4.45s (± 0.37%)}	_~	_4.43s	_4.47s	_{p=0.936 n=6}
_{Bind Time}	_{1.92s (± 1.50%)}	_{1.91s (± 2.39%)}	_~	_1.86s	_1.98s	_{p=0.520 n=6}
_{Check Time}	_{21.65s (± 0.24%)}	_{21.68s (± 0.34%)}	_~	_21.60s	_21.80s	_{p=0.630 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{28.01s (± 0.24%)}	_{28.03s (± 0.37%)}	_~	_27.94s	_28.23s	_{p=0.872 n=6}
_{xstate-main - node (v18.15.0, x64)}
_Errors	₃₀	₃₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_672,790	_672,790	_~	_~	_~	_{p=1.000 n=6}
_Types	_201,962	_201,962	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{574,837k (± 0.03%)}	_{574,911k (± 0.02%)}	_~	_574,733k	_575,054k	_{p=0.378 n=6}
_{Parse Time}	_{4.18s (± 0.92%)}	_{4.17s (± 0.58%)}	_~	_4.15s	_4.22s	_{p=0.747 n=6}
_{Bind Time}	_{1.33s (± 0.67%)}	_{1.33s (± 0.88%)}	_~	_1.31s	_1.34s	_{p=0.933 n=6}
_{Check Time}	_{20.71s (± 1.76%)}	_{20.50s (± 1.98%)}	_~	_20.14s	_21.09s	_{p=0.575 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{26.22s (± 1.46%)}	_{26.00s (± 1.54%)}	_~	_25.67s	_26.61s	_{p=0.575 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

typescript-bot · 2025-09-29T21:30:12Z

@ahejlsberg Here are the results of running the top 400 repos with tsc comparing main and refs/pull/62510/merge:

Everything looks good!

Revert back to isObjectLiteralType check

b8448c3

Copilot AI review requested due to automatic review settings September 29, 2025 20:09

github-project-automation bot added this to PR Backlog Sep 29, 2025

github-project-automation bot moved this to Not started in PR Backlog Sep 29, 2025

typescript-bot assigned ahejlsberg Sep 29, 2025

typescript-bot added Author: Team For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Sep 29, 2025

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ahejlsberg requested a review from jakebailey September 29, 2025 20:09

jakebailey approved these changes Sep 29, 2025

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github-project-automation bot moved this from Not started to Needs merge in PR Backlog Sep 29, 2025

ahejlsberg merged commit e350126 into main Sep 29, 2025
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ahejlsberg deleted the port-tsgo-1764 branch September 29, 2025 21:48

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Port microsoft/typescript-go#1764#62510

Port microsoft/typescript-go#1764#62510
ahejlsberg merged 1 commit intomainfrom
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