Fixed an issue with "slow" sync iteration types spoiling cached value for async ones #62676

Andarist · 2025-10-26T09:26:54Z

… for async ones

jakebailey · 2025-10-26T16:23:34Z

typescript-bot · 2025-10-26T16:23:39Z

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 · 2025-10-26T16:46:05Z

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

Everything looks the same!

You can check the log here.

typescript-bot · 2025-10-26T16:52:38Z

@jakebailey Here are the results of running the user tests with tsc comparing main and refs/pull/62676/merge:

There were infrastructure failures potentially unrelated to your change:

1 instance of "Git clone failed"

Otherwise...

Everything looks good!

typescript-bot · 2025-10-26T17:17:01Z

@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	₁	₁	_~	_~	_~	_{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}	_{193,331k (± 0.79%)}	_{193,272k (± 0.77%)}	_~	_192,651k	_196,324k	_{p=1.000 n=6}
_{Parse Time}	_{1.31s (± 0.39%)}	_{1.30s (± 0.40%)}	_{-0.01s (- 0.77%)}	_1.29s	_1.30s	_{p=0.018 n=6}
_{Bind Time}	_0.72s	_{0.72s (± 0.71%)}	_~	_0.72s	_0.73s	_{p=0.174 n=6}
_{Check Time}	_{9.73s (± 0.40%)}	_{9.72s (± 0.31%)}	_~	_9.70s	_9.77s	_{p=0.806 n=6}
_{Emit Time}	_{2.75s (± 0.63%)}	_{2.74s (± 1.14%)}	_~	_2.72s	_2.80s	_{p=0.463 n=6}
_{Total Time}	_{14.51s (± 0.31%)}	_{14.49s (± 0.25%)}	_~	_14.44s	_14.53s	_{p=0.333 n=6}
_{angular-1 - node (v18.15.0, x64)}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_955,117	_955,117	_~	_~	_~	_{p=1.000 n=6}
_Types	_415,619	_415,619	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{1,254,534k (± 0.00%)}	_{1,254,561k (± 0.00%)}	_~	_1,254,491k	_1,254,623k	_{p=0.470 n=6}
_{Parse Time}	_{6.55s (± 0.50%)}	_{6.54s (± 0.81%)}	_~	_6.48s	_6.61s	_{p=1.000 n=6}
_{Bind Time}	_{1.88s (± 0.27%)}	_{1.88s (± 0.40%)}	_~	_1.87s	_1.89s	_{p=0.784 n=6}
_{Check Time}	_{32.15s (± 0.37%)}	_{32.25s (± 0.25%)}	_~	_32.16s	_32.36s	_{p=0.128 n=6}
_{Emit Time}	_{14.84s (± 0.66%)}	_{14.88s (± 0.43%)}	_~	_14.77s	_14.95s	_{p=0.630 n=6}
_{Total Time}	_{55.42s (± 0.37%)}	_{55.55s (± 0.13%)}	_~	_55.49s	_55.65s	_{p=0.229 n=6}
_{mui-docs - node (v18.15.0, x64)}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_552,486	_552,486	_~	_~	_~	_{p=1.000 n=6}
_Types	₈₉	₈₉	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{827,443k (± 0.00%)}	_{827,428k (± 0.00%)}	_~	_827,392k	_827,442k	_{p=0.107 n=6}
_{Parse Time}	_{8.61s (± 0.25%)}	_{8.69s (± 0.88%)}	_~	_8.59s	_8.75s	_{p=0.124 n=6}
_{Bind Time}	_{2.19s (± 0.34%)}	_{2.19s (± 0.75%)}	_~	_2.16s	_2.21s	_{p=0.548 n=6}
_{Check Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Emit Time}	_{0.27s (± 3.66%)}	_{0.27s (± 3.15%)}	_~	_0.26s	_0.28s	_{p=0.588 n=6}
_{Total Time}	_{11.07s (± 0.26%)}	_{11.14s (± 0.66%)}	_~	_11.04s	_11.21s	_{p=0.170 n=6}
_{self-build-src - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,237,224	_1,237,222	_{-2 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_259,862	_259,862	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{2,486,161k (±11.94%)}	_{2,364,865k (± 0.01%)}	_~	_2,364,472k	_2,365,137k	_{p=0.471 n=6}
_{Parse Time}	_{5.15s (± 1.12%)}	_{5.12s (± 1.38%)}	_~	_5.03s	_5.23s	_{p=0.470 n=6}
_{Bind Time}	_{1.77s (± 0.47%)}	_{1.78s (± 0.78%)}	_~	_1.76s	_1.79s	_{p=0.197 n=6}
_{Check Time}	_{35.17s (± 0.60%)}	_{35.11s (± 0.38%)}	_~	_34.84s	_35.20s	_{p=0.335 n=6}
_{Emit Time}	_{3.01s (± 1.43%)}	_{2.99s (± 2.10%)}	_~	_2.93s	_3.10s	_{p=0.572 n=6}
_{Total Time}	_{45.11s (± 0.51%)}	_{45.01s (± 0.33%)}	_~	_44.73s	_45.15s	_{p=0.689 n=6}
_{self-build-src-public-api - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,237,224	_1,237,222	_{-2 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_259,862	_259,862	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,158,814k (± 0.01%)}	_{3,064,470k (± 7.53%)}	_~	_2,593,019k	_3,158,921k	_{p=0.471 n=6}
_{Parse Time}	_{8.46s (± 0.93%)}	_{8.44s (± 0.82%)}	_~	_8.32s	_8.51s	_{p=0.336 n=6}
_{Bind Time}	_{2.65s (± 0.66%)}	_{2.65s (± 1.21%)}	_~	_2.61s	_2.70s	_{p=1.000 n=6}
_{Check Time}	_{52.75s (± 0.38%)}	_{52.61s (± 1.01%)}	_~	_51.54s	_52.99s	_{p=0.471 n=6}
_{Emit Time}	_{4.36s (± 2.36%)}	_{4.34s (± 2.21%)}	_~	_4.20s	_4.47s	_{p=0.575 n=6}
_{Total Time}	_{68.24s (± 0.46%)}	_{68.05s (± 0.88%)}	_~	_66.87s	_68.45s	_{p=0.936 n=6}
_{self-compiler - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_262,502	_262,500	_{-2 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_104,038	_104,038	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{440,632k (± 0.01%)}	_{440,662k (± 0.01%)}	_~	_440,625k	_440,719k	_{p=0.521 n=6}
_{Parse Time}	_{3.48s (± 1.06%)}	_{3.49s (± 1.11%)}	_~	_3.45s	_3.54s	_{p=1.000 n=6}
_{Bind Time}	_{1.32s (± 1.24%)}	_{1.32s (± 1.62%)}	_~	_1.30s	_1.35s	_{p=1.000 n=6}
_{Check Time}	_{18.93s (± 0.41%)}	_{18.98s (± 0.18%)}	_~	_18.92s	_19.01s	_{p=0.173 n=6}
_{Emit Time}	_{1.52s (± 1.50%)}	_{1.53s (± 0.68%)}	_~	_1.52s	_1.54s	_{p=0.679 n=6}
_{Total Time}	_{25.24s (± 0.43%)}	_{25.31s (± 0.28%)}	_~	_25.24s	_25.43s	_{p=0.227 n=6}
_{ts-pre-modules - node (v18.15.0, x64)}
_Errors	₇₂	₇₂	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_225,374	_225,374	_~	_~	_~	_{p=1.000 n=6}
_Types	_94,297	_94,297	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{370,062k (± 0.03%)}	_{370,132k (± 0.02%)}	_~	_370,026k	_370,224k	_{p=0.128 n=6}
_{Parse Time}	_{2.84s (± 0.69%)}	_{2.84s (± 0.76%)}	_~	_2.81s	_2.87s	_{p=0.625 n=6}
_{Bind Time}	_{1.61s (± 1.52%)}	_{1.60s (± 0.88%)}	_~	_1.58s	_1.62s	_{p=0.516 n=6}
_{Check Time}	_{16.51s (± 0.41%)}	_{16.46s (± 0.28%)}	_~	_16.37s	_16.49s	_{p=0.258 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{20.97s (± 0.36%)}	_{20.90s (± 0.25%)}	_~	_20.82s	_20.95s	_{p=0.109 n=6}
_{vscode - node (v18.15.0, x64)}
_Errors	₅	₅	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_3,976,785	_3,976,785	_~	_~	_~	_{p=1.000 n=6}
_Types	_1,248,019	_1,248,019	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,763,060k (± 0.00%)}	_{3,763,075k (± 0.00%)}	_~	_3,762,865k	_3,763,270k	_{p=1.000 n=6}
_{Parse Time}	_{15.32s (± 1.21%)}	_{15.28s (± 0.31%)}	_~	_15.23s	_15.34s	_{p=0.377 n=6}
_{Bind Time}	_{5.01s (± 1.06%)}	_{5.31s (±12.85%)}	_~	_5.02s	_6.70s	_{p=0.288 n=6}
_{Check Time}	_{102.89s (± 1.86%)}	_{102.29s (± 1.70%)}	_~	_101.00s	_105.42s	_{p=0.689 n=6}
_{Emit Time}	_{40.70s (± 9.83%)}	_{38.66s (±13.25%)}	_~	_31.20s	_47.34s	_{p=0.810 n=6}
_{Total Time}	_{163.92s (± 2.98%)}	_{161.54s (± 2.89%)}	_~	_158.56s	_171.00s	_{p=0.173 n=6}
_{webpack - node (v18.15.0, x64)}
_Errors	₄₀	₄₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_373,563	_373,563	_~	_~	_~	_{p=1.000 n=6}
_Types	_163,454	_163,454	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{530,081k (± 0.02%)}	_{530,076k (± 0.01%)}	_~	_529,998k	_530,145k	_{p=1.000 n=6}
_{Parse Time}	_{4.52s (± 0.59%)}	_{4.56s (± 0.97%)}	_~	_4.51s	_4.62s	_{p=0.195 n=6}
_{Bind Time}	_{1.94s (± 1.55%)}	_{1.96s (± 1.31%)}	_~	_1.92s	_1.99s	_{p=0.244 n=6}
_{Check Time}	_{22.08s (± 0.45%)}	_{22.16s (± 0.39%)}	_~	_22.07s	_22.26s	_{p=0.228 n=6}
_{Emit Time}	_{0.00s (±244.70%)}	_{0.00s (±244.70%)}	_~	_0.00s	_0.01s	_{p=1.000 n=6}
_{Total Time}	_{28.54s (± 0.43%)}	_{28.68s (± 0.42%)}	_~	_28.52s	_28.82s	_{p=0.148 n=6}
_{xstate-main - node (v18.15.0, x64)}
_Errors	₃₀	₃₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_676,692	_676,692	_~	_~	_~	_{p=1.000 n=6}
_Types	_203,798	_203,798	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{578,564k (± 0.03%)}	_{578,514k (± 0.03%)}	_~	_578,326k	_578,757k	_{p=0.689 n=6}
_{Parse Time}	_{4.17s (± 0.77%)}	_{4.18s (± 0.63%)}	_~	_4.14s	_4.22s	_{p=0.625 n=6}
_{Bind Time}	_{1.34s (± 0.94%)}	_{1.35s (± 1.13%)}	_~	_1.32s	_1.36s	_{p=0.490 n=6}
_{Check Time}	_{20.54s (± 2.15%)}	_{20.75s (± 1.74%)}	_~	_20.23s	_21.04s	_{p=0.689 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{26.06s (± 1.69%)}	_{26.28s (± 1.38%)}	_~	_25.77s	_26.57s	_{p=0.810 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 · 2025-10-26T17:41:57Z

@jakebailey Here are the results of running the top 400 repos with tsc comparing main and refs/pull/62676/merge:

Everything looks good!

Fixed an issue with "slow" sync iteration types spoiling cached value…

1d7107a

… for async ones

github-project-automation bot added this to PR Backlog Oct 26, 2025

github-project-automation bot moved this to Not started in PR Backlog Oct 26, 2025

typescript-bot added the For Uncommitted Bug PR for untriaged, rejected, closed or missing bug label Oct 26, 2025

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typescript-bot added For Backlog Bug PRs that fix a backlog bug and removed For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Oct 27, 2025

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Fixed an issue with "slow" sync iteration types spoiling cached value for async ones #62676

Fixed an issue with "slow" sync iteration types spoiling cached value for async ones #62676

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Fixed an issue with "slow" sync iteration types spoiling cached value for async ones #62676

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Fixed an issue with "slow" sync iteration types spoiling cached value for async ones #62676

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