Avoid resolving property types that cannot be unit types when looking for key properties by Andarist · Pull Request #65056 · microsoft/TypeScript

Mateusz Burzyński (Andarist) · 2026-10-30T15:12:17Z

No description provided.

… for key properties

Jake Bailey (jakebailey) · 2026-10-30T15:13:28Z

TypeScript Bot (@typescript-bot) test it

typescript-automation · 2026-10-30T15:13:34Z

Hey Jake Bailey (@jakebailey), this PR was updated less than two minutes before this command. Please wait until it has been unchanged for two minutes and try again.

Jake Bailey (jakebailey) · 2026-10-30T15:20:17Z

TypeScript Bot (@typescript-bot) test it

typescript-automation · 2026-10-30T15:20:23Z

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-automation · 2026-10-30T15:54:14Z

Hey Jake Bailey (@jakebailey), the results of running the DT tests are ready.

Everything looks the same!

You can check the log here.

typescript-automation · 2026-10-30T16:01:40Z

Jake Bailey (@jakebailey) Here are the results of running the user tests with tsc comparing baseline and pr:

Everything looks good!

typescript-automation · 2026-10-30T16:16:54Z

Jake Bailey (@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 - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_88,466	_88,466	_~	_~	_~	_{p=1.000 n=20}
_Types	_79,607	_77,569	_{-2,038 (- 2.56%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{104,071k (± 0.02%)}	_{103,650k (± 0.03%)}	_{-420k (- 0.40%)}	_103,559k	_103,744k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,262,379 (± 0.01%)}	_{1,257,565 (± 0.01%)}	_{-4,814 (- 0.38%)}	_1,256,980	_1,258,149	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.023s (± 3.59%)}	_{0.023s (± 3.63%)}	_~	_0.019s	_0.025s	_{p=0.886 n=20}
_{Bind Time}	_{0.009s (± 5.40%)}	_{0.009s (± 6.89%)}	_~	_0.007s	_0.011s	_{p=0.887 n=20}
_{Check Time}	_{0.209s (± 0.66%)}	_{0.211s (± 0.72%)}	_~	_0.206s	_0.219s	_{p=0.087 n=20}
_{Emit Time}	_{0.136s (± 0.80%)}	_{0.137s (± 0.69%)}	_~	_0.134s	_0.141s	_{p=0.629 n=20}
_{Total Time}	_{0.379s (± 0.34%)}	_{0.382s (± 0.48%)}	_~	_0.376s	_0.391s	_{p=0.054 n=20}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_{586,489 (± 0.02%)}	_{586,498 (± 0.02%)}	_~	_586,063	_586,825	_{p=0.794 n=20}
_Types	_{241,688 (± 0.00%)}	_{234,199 (± 0.00%)}	_{🟩-7,489 (- 3.10%)}	_234,196	_234,212	_{p=0.000 n=20}
_{Memory Used}	_{517,715k (± 0.01%)}	_{516,212k (± 0.02%)}	_{-1,503k (- 0.29%)}	_515,880k	_516,814k	_{p=0.000 n=20}
_{Memory Allocs}	_{7,793,407 (± 0.10%)}	_{7,776,389 (± 0.13%)}	_{-17,017 (- 0.22%)}	_7,762,915	_7,848,317	_{p=0.000 n=20}
_{Config Time}	_{0.008s (± 2.73%)}	_{0.008s (± 2.10%)}	_~	_0.008s	_0.009s	_{p=0.273 n=20}
_{Parse Time}	_{0.132s (± 7.18%)}	_{0.122s (± 2.69%)}	_~	_0.112s	_0.144s	_{p=0.135 n=20}
_{Bind Time}	_{0.043s (± 7.30%)}	_{0.047s (±11.90%)}	_~	_0.038s	_0.075s	_{p=0.516 n=20}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=20}
_{Emit Time}	_{0.845s (± 0.94%)}	_{0.854s (± 1.00%)}	_~	_0.827s	_0.884s	_{p=0.103 n=20}
_{Total Time}	_{1.040s (± 1.32%)}	_{1.043s (± 1.24%)}	_~	_1.010s	_1.090s	_{p=0.525 n=20}
_{arktype - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_685,920	_685,920	_~	_~	_~	_{p=1.000 n=20}
_Types	_939,467	_934,240	_{-5,227 (- 0.56%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{494,721k (± 0.01%)}	_{493,596k (± 0.01%)}	_{-1,125k (- 0.23%)}	_493,364k	_493,804k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,062,902 (± 0.01%)}	_{12,051,296 (± 0.02%)}	_{-11,606 (- 0.10%)}	_12,047,042	_12,063,113	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.041s (± 3.89%)}	_{0.040s (± 2.43%)}	_~	_0.036s	_0.044s	_{p=0.660 n=20}
_{Bind Time}	_{0.014s (± 9.73%)}	_{0.013s (± 9.31%)}	_~	_0.011s	_0.019s	_{p=0.347 n=20}
_{Check Time}	_{0.958s (± 0.65%)}	_{0.962s (± 0.67%)}	_~	_0.934s	_0.981s	_{p=0.372 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.043s (± 0.53%)}	_{1.045s (± 0.52%)}	_~	_1.021s	_1.064s	_{p=0.606 n=20}
_{class-transformer - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_45,376	_45,376	_~	_~	_~	_{p=1.000 n=20}
_Types	_7,573	_7,366	_{-207 (- 2.73%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{27,838k (± 0.02%)}	_{27,787k (± 0.02%)}	_{-51k (- 0.18%)}	_27,765k	_27,809k	_{p=0.000 n=20}
_{Memory Allocs}	_{248,214 (± 0.06%)}	_{247,551 (± 0.06%)}	_{-663 (- 0.27%)}	_247,145	_248,596	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.012s (± 3.68%)}	_{0.012s (± 3.68%)}	_~	_0.010s	_0.013s	_{p=0.936 n=20}
_{Bind Time}	_{0.004s (±13.92%)}	_{0.004s (±13.12%)}	_~	_0.003s	_0.006s	_{p=0.779 n=20}
_{Check Time}	_{0.008s (± 6.07%)}	_{0.008s (± 4.91%)}	_~	_0.007s	_0.009s	_{p=0.721 n=20}
_{Emit Time}	_{0.009s (± 5.61%)}	_{0.009s (± 5.15%)}	_~	_0.007s	_0.010s	_{p=0.251 n=20}
_{Total Time}	_{0.033s (± 2.53%)}	_{0.033s (± 2.03%)}	_~	_0.030s	_0.035s	_{p=0.783 n=20}
_{effect - native}
_Errors	₁₂	₁₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,235,115	_1,235,115	_~	_~	_~	_{p=1.000 n=20}
_Types	_894,113	_878,390	_{-15,723 (- 1.76%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{939,035k (± 0.02%)}	_{935,616k (± 0.02%)}	_{-3,419k (- 0.36%)}	_935,067k	_936,416k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,633,333 (± 0.02%)}	_{12,602,298 (± 0.02%)}	_{-31,035 (- 0.25%)}	_12,595,989	_12,612,937	_{p=0.000 n=20}
_{Config Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.148s (± 1.82%)}	_{0.150s (± 1.65%)}	_~	_0.143s	_0.161s	_{p=0.273 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.952s (± 1.74%)}	_{0.939s (± 0.88%)}	_~	_0.907s	_0.980s	_{p=0.203 n=20}
_{Emit Time}	_{0.501s (± 2.39%)}	_{0.508s (± 2.12%)}	_~	_0.468s	_0.537s	_{p=0.433 n=20}
_{Total Time}	_{1.697s (± 0.88%)}	_{1.692s (± 0.57%)}	_~	_1.644s	_1.722s	_{p=0.857 n=20}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_3,784,019	_3,784,584	_{+565 (+ 0.01%)}	_~	_~	_{p=0.000 n=20}
_Types	_1,355,974	_1,281,353	_{🟩-74,621 (- 5.50%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{1,768,368k (± 0.07%)}	_{1,750,271k (± 0.06%)}	_{-18,097k (- 1.02%)}	_1,745,505k	_1,753,719k	_{p=0.000 n=20}
_{Memory Allocs}	_{25,773,701 (± 0.16%)}	_{25,563,297 (± 0.16%)}	_{-210,404 (- 0.82%)}	_25,461,390	_25,823,561	_{p=0.000 n=20}
_{Config Time}	_0.008s	_{0.008s (± 1.77%)}	_~	_0.008s	_0.009s	_{p=0.487 n=20}
_{Parse Time}	_{0.299s (± 2.20%)}	_{0.293s (± 2.11%)}	_~	_0.269s	_0.317s	_{p=0.239 n=20}
_{Bind Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{3.047s (± 0.89%)}	_{3.016s (± 0.91%)}	_~	_2.939s	_3.141s	_{p=0.098 n=20}
_{Emit Time}	_{0.246s (± 2.27%)}	_{0.242s (± 1.22%)}	_~	_0.234s	_0.256s	_{p=0.198 n=20}
_{Total Time}	_{4.092s (± 0.83%)}	_{4.053s (± 0.79%)}	_~	_3.974s	_4.206s	_{p=0.064 n=20}
_{sentry - native}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,793,245	_4,793,247	_{+2 (+ 0.00%)}	_~	_~	_{p=0.000 n=20}
_Types	_2,607,045	_2,504,214	_{🟩-102,831 (- 3.94%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{2,846,136k (± 0.03%)}	_{2,823,175k (± 0.02%)}	_{-22,961k (- 0.81%)}	_2,819,467k	_2,825,419k	_{p=0.000 n=20}
_{Memory Allocs}	_{75,183,057 (± 0.31%)}	_{74,775,458 (± 0.24%)}	_{-407,599 (- 0.54%)}	_74,372,796	_75,815,387	_{p=0.000 n=20}
_{Config Time}	_{0.026s (± 1.42%)}	_{0.025s (± 0.92%)}	_~	_0.025s	_0.026s	_{p=0.162 n=20}
_{Parse Time}	_{0.474s (± 5.13%)}	_{0.486s (± 4.65%)}	_~	_0.428s	_0.616s	_{p=0.256 n=20}
_{Bind Time}	_{0.192s (±12.21%)}	_{0.173s (±10.98%)}	_~	_0.131s	_0.238s	_{p=0.193 n=20}
_{Check Time}	_{6.672s (± 0.83%)}	_{6.658s (± 0.57%)}	_~	_6.556s	_6.922s	_{p=0.836 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.414s (± 0.75%)}	_{7.395s (± 0.55%)}	_~	_7.287s	_7.649s	_{p=0.847 n=20}
_{social-app - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,883,074	_1,883,074	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,158,168	_1,133,459	_{-24,709 (- 2.13%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{966,315k (± 0.02%)}	_{960,841k (± 0.02%)}	_{-5,474k (- 0.57%)}	_960,116k	_961,320k	_{p=0.000 n=20}
_{Memory Allocs}	_{13,500,137 (± 0.19%)}	_{13,456,450 (± 0.28%)}	_{-43,687 (- 0.32%)}	_13,382,649	_13,674,140	_{p=0.006 n=20}
_{Config Time}	_0.008s	_{0.008s (± 1.89%)}	_~	_0.007s	_0.009s	_{p=1.000 n=20}
_{Parse Time}	_{0.161s (± 3.05%)}	_{0.157s (± 2.06%)}	_~	_0.147s	_0.174s	_{p=0.303 n=20}
_{Bind Time}	_{0.044s (± 9.23%)}	_{0.049s (±10.11%)}	_~	_0.038s	_0.072s	_{p=0.059 n=20}
_{Check Time}	_{1.484s (± 0.94%)}	_{1.475s (± 1.10%)}	_~	_1.432s	_1.550s	_{p=0.234 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.714s (± 0.95%)}	_{1.708s (± 0.99%)}	_~	_1.665s	_1.792s	_{p=0.337 n=20}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,184,972	_1,184,972	_~	_~	_~	_{p=1.000 n=20}
_Types	_438,963	_420,367	_{🟩-18,596 (- 4.24%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{1,167,478k (± 0.30%)}	_{1,164,661k (± 0.41%)}	_~	_1,149,254k	_1,189,864k	_{p=0.114 n=20}
_{Memory Allocs}	_{47,594,740 (± 0.10%)}	_{47,226,404 (± 0.12%)}	_{-368,336 (- 0.77%)}	_47,055,025	_47,393,686	_{p=0.000 n=20}
_{Config Time}	_{0.002s (±19.09%)}	_{0.002s (±12.90%)}	_~	_0.001s	_0.002s	_{p=1.000 n=20}
_{Parse Time}	_{0.147s (± 2.41%)}	_{0.146s (± 2.30%)}	_~	_0.131s	_0.157s	_{p=0.605 n=20}
_{Bind Time}	_0.000s	_{0.000s (±208.60%)}	_~	_0.000s	_0.002s	_{p=1.000 n=20}
_{Check Time}	_{0.842s (± 0.82%)}	_{0.838s (± 0.72%)}	_~	_0.807s	_0.863s	_{p=0.507 n=20}
_{Emit Time}	_{0.148s (± 2.02%)}	_{0.150s (± 2.96%)}	_~	_0.139s	_0.175s	_{p=0.984 n=20}
_{Total Time}	_{9.823s (± 0.80%)}	_{9.788s (± 0.67%)}	_~	_9.466s	_10.024s	_{p=0.640 n=20}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_263,511	_263,511	_~	_~	_~	_{p=1.000 n=20}
_Types	_196,116	_188,476	_{🟩-7,640 (- 3.90%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{224,108k (± 0.02%)}	_{222,258k (± 0.02%)}	_{-1,851k (- 0.83%)}	_221,944k	_222,389k	_{p=0.000 n=20}
_{Memory Allocs}	_{2,389,514 (± 0.01%)}	_{2,371,413 (± 0.01%)}	_{-18,101 (- 0.76%)}	_2,369,701	_2,372,609	_{p=0.000 n=20}
_{Config Time}	_0.000s	_{0.000s (±208.60%)}	_~	_0.000s	_0.002s	_{p=1.000 n=20}
_{Parse Time}	_{0.049s (± 3.39%)}	_{0.053s (±12.74%)}	_~	_0.045s	_0.112s	_{p=0.662 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.389s (± 1.36%)}	_{0.388s (± 1.25%)}	_~	_0.370s	_0.407s	_{p=0.931 n=20}
_{Emit Time}	_{0.049s (± 4.11%)}	_{0.046s (± 4.95%)}	_{🟩-0.003s (- 6.19%)}	_0.041s	_0.056s	_{p=0.019 n=20}
_{Total Time}	_{0.517s (± 1.10%)}	_{0.515s (± 1.87%)}	_~	_0.492s	_0.589s	_{p=0.317 n=20}
_{t3code-server - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,350,661	_4,350,661	_~	_~	_~	_{p=1.000 n=20}
_Types	_3,040,644	_2,958,636	_{-82,008 (- 2.70%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{2,424,794k (± 0.02%)}	_{2,406,867k (± 0.02%)}	_{-17,927k (- 0.74%)}	_2,405,370k	_2,409,730k	_{p=0.000 n=20}
_{Memory Allocs}	_{37,180,695 (± 0.08%)}	_{36,997,184 (± 0.09%)}	_{-183,511 (- 0.49%)}	_36,920,616	_37,214,194	_{p=0.000 n=20}
_{Config Time}	_0.003s	_{0.003s (±13.04%)}	_~	_0.003s	_0.007s	_{p=1.000 n=20}
_{Parse Time}	_{0.247s (± 2.06%)}	_{0.258s (± 4.77%)}	_~	_0.240s	_0.363s	_{p=0.057 n=20}
_{Bind Time}	_{0.098s (±12.62%)}	_{0.081s (± 7.87%)}	_~	_0.074s	_0.133s	_{p=0.099 n=20}
_{Check Time}	_{7.170s (± 0.41%)}	_{7.163s (± 0.61%)}	_~	_7.049s	_7.459s	_{p=0.569 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.529s (± 0.38%)}	_{7.516s (± 0.69%)}	_~	_7.384s	_7.915s	_{p=0.351 n=20}
_{tanstack-router - native}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_571,756	_571,756	_~	_~	_~	_{p=1.000 n=20}
_Types	_397,689	_395,397	_{-2,292 (- 0.58%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{326,076k (± 0.01%)}	_{325,549k (± 0.02%)}	_{-527k (- 0.16%)}	_325,282k	_325,775k	_{p=0.000 n=20}
_{Memory Allocs}	_{4,338,667 (± 0.17%)}	_{4,329,721 (± 0.17%)}	_{-8,946 (- 0.21%)}	_4,314,496	_4,358,698	_{p=0.012 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.039s (± 3.34%)}	_{0.040s (± 3.77%)}	_~	_0.034s	_0.044s	_{p=0.549 n=20}
_{Bind Time}	_{0.014s (±14.01%)}	_{0.014s (±10.05%)}	_~	_0.011s	_0.020s	_{p=0.369 n=20}
_{Check Time}	_{0.591s (± 0.78%)}	_{0.595s (± 3.21%)}	_~	_0.567s	_0.765s	_{p=0.351 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.664s (± 0.89%)}	_{0.668s (± 2.97%)}	_~	_0.643s	_0.845s	_{p=0.533 n=20}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_231,616	_231,616	_~	_~	_~	_{p=1.000 n=20}
_Types	_181,195	_173,731	_{🟩-7,464 (- 4.12%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{193,179k (± 0.01%)}	_{191,352k (± 0.01%)}	_{-1,827k (- 0.95%)}	_191,196k	_191,469k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,310,748 (± 0.02%)}	_{1,292,859 (± 0.02%)}	_{-17,888 (- 1.36%)}	_1,292,183	_1,294,033	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.044s (± 2.32%)}	_{0.042s (± 3.04%)}	_~	_0.038s	_0.048s	_{p=0.070 n=20}
_{Bind Time}	_{0.021s (± 5.45%)}	_{0.021s (± 5.79%)}	_~	_0.017s	_0.027s	_{p=0.802 n=20}
_{Check Time}	_{0.293s (± 1.26%)}	_{0.292s (± 0.96%)}	_~	_0.281s	_0.299s	_{p=0.523 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.364s (± 0.99%)}	_{0.361s (± 0.77%)}	_~	_0.351s	_0.371s	_{p=0.322 n=20}
_{vscode - native}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_7,527,221	_7,527,221	_~	_~	_~	_{p=1.000 n=20}
_Types	_4,423,289	_4,210,551	_{🟩-212,738 (- 4.81%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{5,219,862k (± 0.02%)}	_{5,173,202k (± 0.01%)}	_{-46,660k (- 0.89%)}	_5,170,547k	_5,177,853k	_{p=0.000 n=20}
_{Memory Allocs}	_{57,151,077 (± 0.02%)}	_{56,675,452 (± 0.02%)}	_{-475,626 (- 0.83%)}	_56,650,387	_56,742,299	_{p=0.000 n=20}
_{Config Time}	_{0.034s (± 0.95%)}	_{0.035s (± 1.80%)}	_~	_0.032s	_0.038s	_{p=0.125 n=20}
_{Parse Time}	_{0.994s (± 2.32%)}	_{0.989s (± 2.64%)}	_~	_0.882s	_1.060s	_{p=0.867 n=20}
_{Bind Time}	_{0.335s (± 6.43%)}	_{0.360s (± 9.32%)}	_~	_0.297s	_0.577s	_{p=0.113 n=20}
_{Check Time}	_{8.144s (± 0.74%)}	_{8.142s (± 1.39%)}	_~	_7.669s	_8.639s	_{p=0.889 n=20}
_{Emit Time}	_{2.942s (± 4.71%)}	_{2.948s (± 5.09%)}	_~	_2.687s	_3.607s	_{p=0.673 n=20}
_{Total Time}	_{12.509s (± 1.10%)}	_{12.536s (± 1.22%)}	_~	_11.830s	_13.124s	_{p=0.673 n=20}
_{webpack - native}
_Errors	₆₁₂	₆₁₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_925,725	_925,725	_~	_~	_~	_{p=1.000 n=20}
_Types	_650,047	_622,943	_{🟩-27,104 (- 4.17%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{697,612k (± 0.01%)}	_{691,102k (± 0.01%)}	_{-6,510k (- 0.93%)}	_690,760k	_691,548k	_{p=0.000 n=20}
_{Memory Allocs}	_{6,508,012 (± 0.06%)}	_{6,443,707 (± 0.05%)}	_{-64,305 (- 0.99%)}	_6,433,920	_6,456,184	_{p=0.000 n=20}
_{Config Time}	_0.004s	_0.004s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.134s (± 2.22%)}	_{0.135s (± 4.49%)}	_~	_0.111s	_0.161s	_{p=0.909 n=20}
_{Bind Time}	_{0.045s (± 9.16%)}	_{0.049s (±12.10%)}	_~	_0.038s	_0.071s	_{p=0.400 n=20}
_{Check Time}	_{1.018s (± 0.51%)}	_{1.008s (± 0.58%)}	_{-0.010s (- 0.96%)}	_0.990s	_1.029s	_{p=0.016 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.225s (± 0.73%)}	_{1.219s (± 0.64%)}	_~	_1.188s	_1.256s	_{p=0.365 n=20}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_640,490	_640,490	_~	_~	_~	_{p=1.000 n=20}
_Types	_387,984	_384,933	_{-3,051 (- 0.79%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{349,478k (± 0.03%)}	_{348,805k (± 0.02%)}	_{-672k (- 0.19%)}	_348,656k	_349,226k	_{p=0.000 n=20}
_{Memory Allocs}	_{3,969,218 (± 0.07%)}	_{3,961,515 (± 0.06%)}	_{-7,703 (- 0.19%)}	_3,954,173	_3,977,377	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.061s (± 2.94%)}	_{0.060s (± 2.15%)}	_~	_0.056s	_0.065s	_{p=0.995 n=20}
_{Bind Time}	_{0.021s (±10.39%)}	_{0.021s (±11.34%)}	_~	_0.017s	_0.033s	_{p=0.775 n=20}
_{Check Time}	_{0.414s (± 0.82%)}	_{0.412s (± 0.91%)}	_~	_0.400s	_0.435s	_{p=0.329 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.501s (± 0.79%)}	_{0.500s (± 1.03%)}	_~	_0.484s	_0.526s	_{p=0.920 n=20}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
arktype - native
class-transformer - native
effect - native
mui-docs - native
sentry - native
social-app - native
strada-build-src - native
strada-compiler - native
t3code-server - native
tanstack-router - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₂₀
_Baseline	_baseline	₂₀

Developer Information:

Download Benchmarks

typescript-automation · 2026-10-30T16:59:56Z

Jake Bailey (@jakebailey) Here are the results of running the top 400 repos with tsc comparing baseline and pr:

Everything looks good!

Copilot

🟡 Changes recommended

The guard prematurely rejects unresolved generic variadic tuples that can normalize to never, potentially preventing key-property map creation and bypassing the discriminant shortcut in removeSubtypes.

1 open issue

Avoid rejecting generic tuples that normalize to never · New

What changed in this PR

This experiment aims to reduce unnecessary property-type resolution when the native TypeScript checker searches for unit-typed discriminant properties.

Changes:

Adds a shared predicate that skips methods and certain instantiated or mapped properties.
Uses the predicate in key-property discovery and union subtype reduction.

File	Description
`tsc/internal/checker/relater.go`	Defines the predicate and applies it to key-property candidate selection.
`tsc/internal/checker/checker.go`	Reuses the predicate when selecting discriminants for subtype reduction.

_{Review effort: Balanced}

…le that can normalize to never

Copilot

🟡 Changes recommended

The shortcut’s preserved literal-property exceptions lack compiler regression tests covering both key-property mapping with at least ten union constituents and subtype reduction.

1 open issue

Add regression tests for skipped unit-typed properties · New

1 resolved since last review

Avoid rejecting generic tuples that normalize to never

_{Review effort: Balanced}

Mateusz Burzyński (Andarist) · 2026-11-02T16:06:35Z

+			if core.Some(uninstantiated.Distributed(), func(t *Type) bool {
+				return t.flags&TypeFlagsObject != 0 && t.objectFlags&ObjectFlagsMapped == 0 && !isGenericTupleType(t)
+			}) {


this is perf-only and we can't really easily test that

typescript-automation · 2026-11-02T16:09:38Z

This PR doesn't have any linked issues. Please open an issue that references this PR. From there we can discuss and prioritise.

Jake Bailey (jakebailey) · 2026-11-02T19:06:06Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-11-02T19:06:14Z

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

Command	Status	Results
`perf test this faster`	✅ Started	👀 Results

typescript-automation · 2026-11-02T20:23:15Z

Jake Bailey (@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 - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_88,466	_88,466	_~	_~	_~	_{p=1.000 n=20}
_Types	_79,607	_77,569	_{-2,038 (- 2.56%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{107,533k (± 0.03%)}	_{107,056k (± 0.03%)}	_{-478k (- 0.44%)}	_106,920k	_107,169k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,262,452 (± 0.01%)}	_{1,257,571 (± 0.01%)}	_{-4,881 (- 0.39%)}	_1,257,131	_1,258,156	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.023s (± 2.16%)}	_{0.023s (± 3.04%)}	_~	_0.018s	_0.024s	_{p=0.736 n=20}
_{Bind Time}	_{0.008s (± 6.34%)}	_{0.008s (± 6.08%)}	_~	_0.006s	_0.010s	_{p=0.397 n=20}
_{Check Time}	_{0.206s (± 0.65%)}	_{0.209s (± 0.70%)}	_{+0.002s (+ 1.07%)}	_0.203s	_0.214s	_{p=0.042 n=20}
_{Emit Time}	_{0.130s (± 0.92%)}	_{0.130s (± 1.05%)}	_~	_0.126s	_0.138s	_{p=0.567 n=20}
_{Total Time}	_{0.370s (± 0.40%)}	_{0.373s (± 0.44%)}	_{+0.002s (+ 0.61%)}	_0.367s	_0.379s	_{p=0.036 n=20}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_586,553	_586,553	_~	_~	_~	_{p=1.000 n=20}
_Types	_241,682	_234,193	_{🟩-7,489 (- 3.10%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{519,826k (± 0.01%)}	_{518,116k (± 0.02%)}	_{-1,709k (- 0.33%)}	_517,617k	_518,584k	_{p=0.000 n=20}
_{Memory Allocs}	_{7,798,481 (± 0.15%)}	_{7,781,990 (± 0.16%)}	_{-16,490 (- 0.21%)}	_7,763,201	_7,850,761	_{p=0.004 n=20}
_{Config Time}	_{0.008s (± 1.30%)}	_{0.008s (± 1.30%)}	_~	_0.008s	_0.009s	_{p=1.000 n=20}
_{Parse Time}	_{0.122s (± 2.50%)}	_{0.121s (± 2.31%)}	_~	_0.111s	_0.137s	_{p=0.825 n=20}
_{Bind Time}	_{0.044s (±12.77%)}	_{0.043s (± 9.84%)}	_~	_0.036s	_0.062s	_{p=0.983 n=20}
_{Emit Time}	_{0.633s (± 0.90%)}	_{0.629s (± 1.07%)}	_~	_0.616s	_0.664s	_{p=0.066 n=20}
_{Total Time}	_{0.819s (± 0.98%)}	_{0.813s (± 0.93%)}	_~	_0.787s	_0.843s	_{p=0.279 n=20}
_{arktype - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_685,920	_685,920	_~	_~	_~	_{p=1.000 n=20}
_Types	_939,467	_934,240	_{-5,227 (- 0.56%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{495,328k (± 0.01%)}	_{494,176k (± 0.01%)}	_{-1,152k (- 0.23%)}	_493,946k	_494,378k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,062,735 (± 0.01%)}	_{12,052,688 (± 0.02%)}	_{-10,047 (- 0.08%)}	_12,047,998	_12,062,975	_{p=0.000 n=20}
_{Config Time}	_{0.001s (±27.21%)}	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.045s (±16.08%)}	_{0.042s (± 3.20%)}	_~	_0.037s	_0.047s	_{p=0.730 n=20}
_{Bind Time}	_{0.013s (± 8.55%)}	_{0.013s (± 7.38%)}	_~	_0.011s	_0.019s	_{p=0.378 n=20}
_{Check Time}	_{0.894s (± 1.30%)}	_{0.890s (± 1.06%)}	_~	_0.861s	_0.938s	_{p=0.743 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.980s (± 1.59%)}	_{0.974s (± 0.92%)}	_~	_0.945s	_1.021s	_{p=0.973 n=20}
_{class-transformer - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_45,376	_45,376	_~	_~	_~	_{p=1.000 n=20}
_Types	_7,573	_7,366	_{-207 (- 2.73%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{27,885k (± 0.04%)}	_{27,829k (± 0.03%)}	_{-55k (- 0.20%)}	_27,810k	_27,863k	_{p=0.000 n=20}
_{Memory Allocs}	_{248,389 (± 0.05%)}	_{247,717 (± 0.03%)}	_{-672 (- 0.27%)}	_247,454	_248,008	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.011s (± 3.09%)}	_{0.011s (± 3.08%)}	_~	_0.009s	_0.012s	_{p=0.900 n=20}
_{Bind Time}	_{0.003s (± 7.63%)}	_{0.003s (±12.77%)}	_~	_0.002s	_0.006s	_{p=0.590 n=20}
_{Check Time}	_{0.007s (± 6.27%)}	_{0.008s (± 7.41%)}	_~	_0.006s	_0.010s	_{p=0.867 n=20}
_{Emit Time}	_{0.007s (± 7.11%)}	_{0.008s (± 7.89%)}	_~	_0.006s	_0.010s	_{p=0.340 n=20}
_{Total Time}	_{0.030s (± 1.94%)}	_{0.031s (± 2.04%)}	_~	_0.027s	_0.033s	_{p=0.173 n=20}
_{effect - native}
_Errors	₁₂	₁₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,235,115	_1,235,115	_~	_~	_~	_{p=1.000 n=20}
_Types	_894,113	_878,390	_{-15,723 (- 1.76%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{949,901k (± 0.02%)}	_{946,387k (± 0.02%)}	_{-3,513k (- 0.37%)}	_945,485k	_947,052k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,639,003 (± 0.03%)}	_{12,607,251 (± 0.04%)}	_{-31,752 (- 0.25%)}	_12,596,971	_12,644,512	_{p=0.000 n=20}
_{Config Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.147s (± 1.28%)}	_{0.145s (± 1.72%)}	_~	_0.139s	_0.157s	_{p=0.233 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.876s (± 0.85%)}	_{0.869s (± 0.69%)}	_~	_0.843s	_0.888s	_{p=0.143 n=20}
_{Emit Time}	_{0.480s (± 1.94%)}	_{0.486s (± 1.92%)}	_~	_0.420s	_0.507s	_{p=0.155 n=20}
_{Total Time}	_{1.597s (± 0.50%)}	_{1.593s (± 0.62%)}	_~	_1.538s	_1.624s	_{p=0.560 n=20}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_3,784,019	_3,784,584	_{+565 (+ 0.01%)}	_~	_~	_{p=0.000 n=20}
_Types	_1,355,974	_1,281,353	_{🟩-74,621 (- 5.50%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{1,767,336k (± 0.07%)}	_{1,750,619k (± 0.07%)}	_{-16,717k (- 0.95%)}	_1,746,222k	_1,758,087k	_{p=0.000 n=20}
_{Memory Allocs}	_{25,772,813 (± 0.15%)}	_{25,578,058 (± 0.12%)}	_{-194,756 (- 0.76%)}	_25,482,077	_25,727,853	_{p=0.000 n=20}
_{Config Time}	_{0.009s (± 2.82%)}	_{0.008s (± 2.82%)}	_~	_0.008s	_0.009s	_{p=1.000 n=20}
_{Parse Time}	_{0.291s (± 2.83%)}	_{0.293s (± 2.06%)}	_~	_0.269s	_0.321s	_{p=0.644 n=20}
_{Bind Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{3.074s (± 1.30%)}	_{3.042s (± 1.41%)}	_~	_2.914s	_3.195s	_{p=0.229 n=20}
_{Emit Time}	_{0.250s (± 1.65%)}	_{0.255s (± 5.01%)}	_~	_0.233s	_0.360s	_{p=0.984 n=20}
_{Total Time}	_{4.129s (± 1.18%)}	_{4.098s (± 1.43%)}	_~	_3.953s	_4.283s	_{p=0.344 n=20}
_{sentry - native}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,793,245	_4,793,247	_{+2 (+ 0.00%)}	_~	_~	_{p=0.000 n=20}
_Types	_2,606,905	_2,504,074	_{🟩-102,831 (- 3.94%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{2,846,945k (± 0.03%)}	_{2,824,037k (± 0.04%)}	_{-22,908k (- 0.80%)}	_2,820,477k	_2,828,207k	_{p=0.000 n=20}
_{Memory Allocs}	_{75,042,392 (± 0.20%)}	_{74,897,068 (± 0.42%)}	_{-145,324 (- 0.19%)}	_74,406,313	_77,281,800	_{p=0.001 n=20}
_{Config Time}	_{0.025s (± 1.68%)}	_{0.025s (± 1.90%)}	_~	_0.024s	_0.027s	_{p=0.581 n=20}
_{Parse Time}	_{0.460s (± 3.40%)}	_{0.495s (± 7.14%)}	_~	_0.424s	_0.670s	_{p=0.218 n=20}
_{Bind Time}	_{0.158s (±11.48%)}	_{0.165s (±10.39%)}	_~	_0.120s	_0.237s	_{p=0.673 n=20}
_{Check Time}	_{6.640s (± 1.31%)}	_{6.578s (± 1.28%)}	_~	_6.406s	_6.958s	_{p=0.213 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.336s (± 1.25%)}	_{7.319s (± 1.32%)}	_~	_7.126s	_7.748s	_{p=0.560 n=20}
_{social-app - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,883,074	_1,883,074	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,158,168	_1,133,459	_{-24,709 (- 2.13%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{966,959k (± 0.02%)}	_{961,436k (± 0.02%)}	_{-5,523k (- 0.57%)}	_960,176k	_962,172k	_{p=0.000 n=20}
_{Memory Allocs}	_{13,497,809 (± 0.18%)}	_{13,453,617 (± 0.26%)}	_{-44,192 (- 0.33%)}	_13,392,623	_13,709,087	_{p=0.000 n=20}
_{Config Time}	_{0.008s (± 4.73%)}	_{0.007s (± 3.20%)}	_~	_0.007s	_0.008s	_{p=1.000 n=20}
_{Parse Time}	_{0.159s (± 3.73%)}	_{0.161s (± 3.37%)}	_~	_0.146s	_0.198s	_{p=0.244 n=20}
_{Bind Time}	_{0.046s (± 9.44%)}	_{0.045s (±10.64%)}	_~	_0.036s	_0.066s	_{p=0.643 n=20}
_{Check Time}	_{1.435s (± 1.32%)}	_{1.450s (± 2.31%)}	_~	_1.376s	_1.644s	_{p=0.995 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.665s (± 1.12%)}	_{1.682s (± 1.95%)}	_~	_1.615s	_1.873s	_{p=0.713 n=20}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,184,972	_1,184,972	_~	_~	_~	_{p=1.000 n=20}
_Types	_438,959	_420,363	_{🟩-18,596 (- 4.24%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{1,170,701k (± 0.35%)}	_{1,163,246k (± 0.46%)}	_{-7,455k (- 0.64%)}	_1,149,521k	_1,206,267k	_{p=0.001 n=20}
_{Memory Allocs}	_{47,562,762 (± 0.10%)}	_{47,279,206 (± 0.09%)}	_{-283,556 (- 0.60%)}	_47,138,237	_47,434,856	_{p=0.000 n=20}
_{Config Time}	_{0.002s (±39.87%)}	_{0.001s (±22.67%)}	_{🟩-0.001s (-36.36%)}	_0.000s	_0.002s	_{p=0.040 n=20}
_{Parse Time}	_{0.144s (± 8.05%)}	_{0.138s (± 2.41%)}	_~	_0.120s	_0.150s	_{p=0.693 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.801s (± 0.46%)}	_{0.795s (± 0.94%)}	_{-0.006s (- 0.73%)}	_0.778s	_0.844s	_{p=0.004 n=20}
_{Emit Time}	_{0.138s (± 1.55%)}	_{0.142s (± 1.76%)}	_{+0.004s (+ 2.98%)}	_0.136s	_0.156s	_{p=0.029 n=20}
_{Total Time}	_{9.318s (± 0.96%)}	_{9.293s (± 0.99%)}	_~	_9.016s	_9.859s	_{p=0.457 n=20}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_263,511	_263,511	_~	_~	_~	_{p=1.000 n=20}
_Types	_196,116	_188,476	_{🟩-7,640 (- 3.90%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{223,544k (± 0.02%)}	_{221,707k (± 0.02%)}	_{-1,837k (- 0.82%)}	_221,526k	_221,844k	_{p=0.000 n=20}
_{Memory Allocs}	_{2,390,979 (± 0.01%)}	_{2,373,073 (± 0.02%)}	_{-17,906 (- 0.75%)}	_2,370,704	_2,374,640	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.051s (± 3.74%)}	_{0.053s (± 4.01%)}	_~	_0.044s	_0.060s	_{p=0.099 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.387s (± 0.74%)}	_{0.393s (± 1.44%)}	_~	_0.378s	_0.424s	_{p=0.233 n=20}
_{Emit Time}	_{0.055s (± 9.44%)}	_{0.049s (± 5.19%)}	_~	_0.042s	_0.059s	_{p=0.056 n=20}
_{Total Time}	_{0.523s (± 1.01%)}	_{0.523s (± 1.22%)}	_~	_0.500s	_0.546s	_{p=0.867 n=20}
_{t3code-server - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,350,661	_4,350,661	_~	_~	_~	_{p=1.000 n=20}
_Types	_3,040,644	_2,958,636	_{-82,008 (- 2.70%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{2,417,248k (± 0.02%)}	_{2,399,388k (± 0.02%)}	_{-17,860k (- 0.74%)}	_2,397,707k	_2,402,144k	_{p=0.000 n=20}
_{Memory Allocs}	_{37,201,626 (± 0.13%)}	_{36,993,275 (± 0.09%)}	_{-208,352 (- 0.56%)}	_36,926,634	_37,211,952	_{p=0.000 n=20}
_{Config Time}	_0.003s	_0.003s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.258s (± 2.21%)}	_{0.255s (± 1.85%)}	_~	_0.235s	_0.270s	_{p=0.323 n=20}
_{Bind Time}	_{0.093s (±10.31%)}	_{0.092s (± 9.38%)}	_~	_0.077s	_0.139s	_{p=0.973 n=20}
_{Check Time}	_{6.110s (± 1.80%)}	_{6.117s (± 1.84%)}	_~	_5.861s	_6.582s	_{p=0.698 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{6.476s (± 1.75%)}	_{6.479s (± 1.76%)}	_~	_6.213s	_6.933s	_{p=0.753 n=20}
_{tanstack-router - native}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_571,756	_571,756	_~	_~	_~	_{p=1.000 n=20}
_Types	_397,689	_395,397	_{-2,292 (- 0.58%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{326,480k (± 0.01%)}	_{326,007k (± 0.01%)}	_{-474k (- 0.15%)}	_325,767k	_326,156k	_{p=0.000 n=20}
_{Memory Allocs}	_{4,339,764 (± 0.32%)}	_{4,333,891 (± 0.23%)}	_~	_4,315,157	_4,406,760	_{p=0.289 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.040s (± 3.37%)}	_{0.040s (± 3.91%)}	_~	_0.034s	_0.047s	_{p=0.538 n=20}
_{Bind Time}	_{0.013s (±11.10%)}	_{0.012s (± 8.77%)}	_~	_0.010s	_0.019s	_{p=0.837 n=20}
_{Check Time}	_{0.515s (± 1.08%)}	_{0.510s (± 1.09%)}	_~	_0.491s	_0.539s	_{p=0.095 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.585s (± 1.05%)}	_{0.581s (± 1.21%)}	_~	_0.558s	_0.618s	_{p=0.317 n=20}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_231,616	_231,616	_~	_~	_~	_{p=1.000 n=20}
_Types	_181,195	_173,731	_{🟩-7,464 (- 4.12%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{192,990k (± 0.01%)}	_{191,149k (± 0.02%)}	_{-1,841k (- 0.95%)}	_191,000k	_191,293k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,311,081 (± 0.02%)}	_{1,293,755 (± 0.02%)}	_{-17,325 (- 1.32%)}	_1,292,784	_1,295,697	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.044s (± 3.13%)}	_{0.044s (± 3.08%)}	_~	_0.040s	_0.050s	_{p=0.761 n=20}
_{Bind Time}	_{0.020s (± 6.77%)}	_{0.019s (± 5.97%)}	_~	_0.015s	_0.024s	_{p=0.398 n=20}
_{Check Time}	_{0.306s (± 1.84%)}	_{0.306s (± 2.01%)}	_~	_0.289s	_0.331s	_{p=0.723 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.377s (± 1.84%)}	_{0.376s (± 1.94%)}	_~	_0.352s	_0.406s	_{p=0.635 n=20}
_{vscode - native}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_7,608,869	_7,608,869	_~	_~	_~	_{p=1.000 n=20}
_Types	_4,467,876	_4,251,540	_{🟩-216,336 (- 4.84%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{5,267,950k (± 0.02%)}	_{5,218,932k (± 0.02%)}	_{-49,018k (- 0.93%)}	_5,215,805k	_5,222,078k	_{p=0.000 n=20}
_{Memory Allocs}	_{57,642,812 (± 0.04%)}	_{57,171,020 (± 0.03%)}	_{-471,792 (- 0.82%)}	_57,139,603	_57,265,586	_{p=0.000 n=20}
_{Config Time}	_{0.033s (± 0.82%)}	_{0.033s (± 0.94%)}	_~	_0.033s	_0.035s	_{p=0.968 n=20}
_{Parse Time}	_{0.878s (± 1.55%)}	_{0.877s (± 1.70%)}	_~	_0.816s	_0.939s	_{p=0.963 n=20}
_{Bind Time}	_{0.297s (± 6.22%)}	_{0.311s (± 8.46%)}	_~	_0.282s	_0.456s	_{p=0.692 n=20}
_{Check Time}	_{7.027s (± 0.78%)}	_{6.958s (± 0.90%)}	_~	_6.661s	_7.133s	_{p=0.201 n=20}
_{Emit Time}	_{2.009s (± 5.21%)}	_{2.140s (± 8.05%)}	_~	_1.889s	_2.872s	_{p=0.753 n=20}
_{Total Time}	_{10.301s (± 0.88%)}	_{10.381s (± 1.34%)}	_~	_10.146s	_11.117s	_{p=0.825 n=20}
_{webpack - native}
_Errors	₆₁₁	₆₁₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_884,750	_884,750	_~	_~	_~	_{p=1.000 n=20}
_Types	_624,363	_598,968	_{🟩-25,395 (- 4.07%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{651,671k (± 0.02%)}	_{645,754k (± 0.01%)}	_{-5,917k (- 0.91%)}	_645,505k	_646,054k	_{p=0.000 n=20}
_{Memory Allocs}	_{6,045,288 (± 0.05%)}	_{5,989,634 (± 0.05%)}	_{-55,653 (- 0.92%)}	_5,982,044	_6,008,584	_{p=0.000 n=20}
_{Config Time}	_0.004s	_0.004s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.131s (± 2.78%)}	_{0.131s (± 2.79%)}	_~	_0.113s	_0.141s	_{p=0.456 n=20}
_{Bind Time}	_{0.041s (± 9.28%)}	_{0.041s (±10.95%)}	_~	_0.033s	_0.072s	_{p=0.623 n=20}
_{Check Time}	_{1.102s (± 1.86%)}	_{1.111s (± 2.78%)}	_~	_1.031s	_1.317s	_{p=0.941 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.301s (± 1.79%)}	_{1.311s (± 2.53%)}	_~	_1.224s	_1.516s	_{p=0.857 n=20}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_640,490	_640,490	_~	_~	_~	_{p=1.000 n=20}
_Types	_387,984	_384,933	_{-3,051 (- 0.79%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{350,111k (± 0.03%)}	_{349,497k (± 0.02%)}	_{-613k (- 0.18%)}	_349,243k	_349,963k	_{p=0.000 n=20}
_{Memory Allocs}	_{3,971,105 (± 0.08%)}	_{3,961,700 (± 0.09%)}	_{-9,406 (- 0.24%)}	_3,951,507	_3,986,602	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.062s (± 3.94%)}	_{0.062s (± 2.81%)}	_~	_0.056s	_0.070s	_{p=0.672 n=20}
_{Bind Time}	_{0.021s (±11.33%)}	_{0.019s (±10.24%)}	_~	_0.016s	_0.033s	_{p=0.158 n=20}
_{Check Time}	_{0.393s (± 1.23%)}	_{0.391s (± 1.22%)}	_~	_0.372s	_0.408s	_{p=0.533 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.482s (± 1.38%)}	_{0.478s (± 1.36%)}	_~	_0.454s	_0.503s	_{p=0.387 n=20}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
arktype - native
class-transformer - native
effect - native
mui-docs - native
sentry - native
social-app - native
strada-build-src - native
strada-compiler - native
t3code-server - native
tanstack-router - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₂₀
_Baseline	_baseline	₂₀

Developer Information:

Download Benchmarks

Wesley Wigham (weswigham) · 2026-11-05T18:47:42Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-11-05T18:47:47Z

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

Command	Status	Results
`perf test this faster`	✅ Started	👀 Results

typescript-automation · 2026-11-05T19:48:05Z

Wesley Wigham (@weswigham)
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 - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_88,466	_88,466	_~	_~	_~	_{p=1.000 n=20}
_Types	_79,607	_77,569	_{-2,038 (- 2.56%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{106,432k (± 0.03%)}	_{105,944k (± 0.03%)}	_{-489k (- 0.46%)}	_105,824k	_106,053k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,261,918 (± 0.01%)}	_{1,257,142 (± 0.01%)}	_{-4,776 (- 0.38%)}	_1,256,763	_1,257,545	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.023s (±15.01%)}	_{0.022s (± 2.77%)}	_~	_0.019s	_0.024s	_{p=0.188 n=20}
_{Bind Time}	_{0.009s (± 6.30%)}	_{0.009s (± 7.01%)}	_~	_0.007s	_0.011s	_{p=0.764 n=20}
_{Check Time}	_{0.215s (± 2.21%)}	_{0.214s (± 1.86%)}	_~	_0.203s	_0.229s	_{p=0.804 n=20}
_{Emit Time}	_{0.141s (± 2.84%)}	_{0.143s (± 3.56%)}	_~	_0.131s	_0.172s	_{p=0.835 n=20}
_{Total Time}	_{0.390s (± 2.74%)}	_{0.391s (± 2.18%)}	_~	_0.369s	_0.430s	_{p=0.507 n=20}
_{angular-1 - native}
_Errors	₆₃	₆₃	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_756,637	_756,637	_~	_~	_~	_{p=1.000 n=20}
_Types	_549,451	_531,843	_{🟩-17,608 (- 3.20%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{644,000k (± 0.02%)}	_{640,235k (± 0.02%)}	_{-3,765k (- 0.58%)}	_639,747k	_640,916k	_{p=0.000 n=20}
_{Memory Allocs}	_{9,542,031 (± 0.06%)}	_{9,500,878 (± 0.07%)}	_{-41,153 (- 0.43%)}	_9,490,367	_9,550,532	_{p=0.000 n=20}
_{Config Time}	_0.009s	_0.009s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.123s (± 2.10%)}	_{0.127s (± 3.45%)}	_~	_0.116s	_0.151s	_{p=0.175 n=20}
_{Bind Time}	_{0.050s (± 9.59%)}	_{0.049s (±11.75%)}	_~	_0.041s	_0.089s	_{p=0.594 n=20}
_{Check Time}	_{0.662s (± 2.46%)}	_{0.664s (± 1.04%)}	_~	_0.637s	_0.686s	_{p=0.203 n=20}
_{Emit Time}	_{0.418s (± 0.61%)}	_{0.417s (± 0.46%)}	_~	_0.408s	_0.427s	_{p=0.447 n=20}
_{Total Time}	_{1.278s (± 1.40%)}	_{1.281s (± 0.79%)}	_~	_1.259s	_1.358s	_{p=0.273 n=20}
_{arktype - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_686,116	_686,116	_~	_~	_~	_{p=1.000 n=20}
_Types	_939,797	_934,519	_{-5,278 (- 0.56%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{476,033k (± 0.01%)}	_{474,883k (± 0.01%)}	_{-1,150k (- 0.24%)}	_474,615k	_475,041k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,058,842 (± 0.01%)}	_{12,048,674 (± 0.02%)}	_{-10,168 (- 0.08%)}	_12,043,132	_12,059,392	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.040s (± 2.84%)}	_{0.041s (± 3.31%)}	_~	_0.037s	_0.049s	_{p=0.898 n=20}
_{Bind Time}	_{0.012s (± 7.46%)}	_{0.012s (± 8.92%)}	_~	_0.011s	_0.021s	_{p=0.543 n=20}
_{Check Time}	_{0.836s (± 0.41%)}	_{0.837s (± 0.43%)}	_~	_0.826s	_0.854s	_{p=0.963 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.916s (± 0.33%)}	_{0.917s (± 0.55%)}	_~	_0.904s	_0.945s	_{p=0.753 n=20}
_{class-transformer - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_45,376	_45,376	_~	_~	_~	_{p=1.000 n=20}
_Types	_7,573	_7,366	_{-207 (- 2.73%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{27,748k (± 0.03%)}	_{27,699k (± 0.03%)}	_{-49k (- 0.18%)}	_27,662k	_27,733k	_{p=0.000 n=20}
_{Memory Allocs}	_{248,254 (± 0.07%)}	_{247,808 (± 0.04%)}	_{-446 (- 0.18%)}	_247,456	_248,269	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.009s (± 3.15%)}	_{0.009s (± 4.02%)}	_~	_0.008s	_0.011s	_{p=0.182 n=20}
_{Bind Time}	_{0.002s (±11.51%)}	_{0.003s (±13.84%)}	_~	_0.002s	_0.004s	_{p=0.371 n=20}
_{Check Time}	_{0.008s (± 6.61%)}	_{0.008s (± 7.41%)}	_~	_0.006s	_0.010s	_{p=0.488 n=20}
_{Emit Time}	_{0.007s (± 5.17%)}	_{0.008s (± 5.42%)}	_~	_0.006s	_0.009s	_{p=0.453 n=20}
_{Total Time}	_{0.028s (± 1.95%)}	_{0.028s (± 1.88%)}	_~	_0.027s	_0.030s	_{p=0.524 n=20}
_{effect - native}
_Errors	₁₂	₁₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,235,134	_1,235,134	_~	_~	_~	_{p=1.000 n=20}
_Types	_893,436	_877,454	_{-15,982 (- 1.79%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{941,478k (± 0.02%)}	_{938,173k (± 0.02%)}	_{-3,305k (- 0.35%)}	_937,482k	_938,890k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,624,465 (± 0.04%)}	_{12,595,396 (± 0.04%)}	_{-29,069 (- 0.23%)}	_12,578,927	_12,618,976	_{p=0.000 n=20}
_{Config Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.148s (± 1.75%)}	_{0.147s (± 1.14%)}	_~	_0.138s	_0.153s	_{p=0.615 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.892s (± 1.48%)}	_{0.896s (± 2.01%)}	_~	_0.841s	_0.996s	_{p=0.753 n=20}
_{Emit Time}	_{0.497s (± 1.76%)}	_{0.494s (± 1.41%)}	_~	_0.471s	_0.520s	_{p=0.625 n=20}
_{Total Time}	_{1.631s (± 1.23%)}	_{1.631s (± 1.19%)}	_~	_1.574s	_1.717s	_{p=0.952 n=20}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_3,782,394	_3,782,959	_{+565 (+ 0.01%)}	_~	_~	_{p=0.000 n=20}
_Types	_1,355,778	_1,281,160	_{🟩-74,618 (- 5.50%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{1,679,977k (± 0.07%)}	_{1,662,656k (± 0.08%)}	_{-17,322k (- 1.03%)}	_1,656,055k	_1,666,834k	_{p=0.000 n=20}
_{Memory Allocs}	_{25,711,461 (± 0.10%)}	_{25,540,396 (± 0.11%)}	_{-171,064 (- 0.67%)}	_25,454,339	_25,631,327	_{p=0.000 n=20}
_{Config Time}	_{0.009s (± 2.82%)}	_{0.008s (± 2.33%)}	_~	_0.008s	_0.009s	_{p=0.096 n=20}
_{Parse Time}	_{0.294s (± 3.22%)}	_{0.288s (± 2.89%)}	_~	_0.240s	_0.321s	_{p=0.343 n=20}
_{Bind Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{2.969s (± 0.95%)}	_{2.928s (± 0.95%)}	_{-0.041s (- 1.38%)}	_2.833s	_3.067s	_{p=0.042 n=20}
_{Emit Time}	_{0.248s (± 1.14%)}	_{0.255s (± 1.89%)}	_{+0.007s (+ 2.79%)}	_0.238s	_0.290s	_{p=0.008 n=20}
_{Total Time}	_{4.023s (± 0.72%)}	_{3.983s (± 0.79%)}	_~	_3.868s	_4.131s	_{p=0.066 n=20}
_{sentry - native}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,793,266	_4,793,268	_{+2 (+ 0.00%)}	_~	_~	_{p=0.000 n=20}
_Types	_2,607,066	_2,504,077	_{🟩-102,989 (- 3.95%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{2,800,194k (± 0.04%)}	_{2,777,421k (± 0.04%)}	_{-22,772k (- 0.81%)}	_2,775,035k	_2,783,470k	_{p=0.000 n=20}
_{Memory Allocs}	_{75,044,982 (± 0.18%)}	_{74,767,075 (± 0.19%)}	_{-277,907 (- 0.37%)}	_74,350,983	_75,604,680	_{p=0.001 n=20}
_{Config Time}	_{0.025s (± 1.05%)}	_{0.025s (± 1.29%)}	_~	_0.024s	_0.026s	_{p=0.286 n=20}
_{Parse Time}	_{0.474s (± 4.93%)}	_{0.466s (± 5.19%)}	_~	_0.417s	_0.606s	_{p=0.525 n=20}
_{Bind Time}	_{0.164s (±12.60%)}	_{0.166s (± 9.92%)}	_~	_0.126s	_0.226s	_{p=0.490 n=20}
_{Check Time}	_{6.558s (± 1.44%)}	_{6.474s (± 0.39%)}	_{-0.084s (- 1.29%)}	_6.370s	_6.563s	_{p=0.026 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.271s (± 1.54%)}	_{7.187s (± 0.42%)}	_~	_7.045s	_7.345s	_{p=0.071 n=20}
_{social-app - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,883,060	_1,883,060	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,158,093	_1,133,377	_{-24,716 (- 2.13%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{952,849k (± 0.02%)}	_{947,272k (± 0.02%)}	_{-5,577k (- 0.59%)}	_946,520k	_948,028k	_{p=0.000 n=20}
_{Memory Allocs}	_{13,508,865 (± 0.28%)}	_{13,466,618 (± 0.34%)}	_{-42,247 (- 0.31%)}	_13,390,644	_13,753,400	_{p=0.001 n=20}
_{Config Time}	_{0.007s (± 3.17%)}	_{0.007s (± 3.11%)}	_~	_0.007s	_0.008s	_{p=1.000 n=20}
_{Parse Time}	_{0.153s (± 2.00%)}	_{0.157s (± 2.40%)}	_~	_0.145s	_0.173s	_{p=0.150 n=20}
_{Bind Time}	_{0.044s (±10.73%)}	_{0.043s (± 9.07%)}	_~	_0.035s	_0.060s	_{p=0.952 n=20}
_{Check Time}	_{1.395s (± 0.67%)}	_{1.388s (± 0.92%)}	_~	_1.343s	_1.450s	_{p=0.286 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.617s (± 0.51%)}	_{1.614s (± 0.65%)}	_~	_1.576s	_1.662s	_{p=0.597 n=20}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,184,972	_1,184,972	_~	_~	_~	_{p=1.000 n=20}
_Types	_438,823	_420,227	_{🟩-18,596 (- 4.24%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{1,158,990k (± 0.29%)}	_{1,153,516k (± 0.18%)}	_{-5,474k (- 0.47%)}	_1,142,659k	_1,161,935k	_{p=0.008 n=20}
_{Memory Allocs}	_{47,615,265 (± 0.09%)}	_{47,285,718 (± 0.08%)}	_{-329,547 (- 0.69%)}	_47,058,390	_47,380,767	_{p=0.000 n=20}
_{Config Time}	_{0.002s (±18.87%)}	_{0.002s (±15.95%)}	_~	_0.001s	_0.002s	_{p=1.000 n=20}
_{Parse Time}	_{0.137s (± 1.91%)}	_{0.136s (± 2.08%)}	_~	_0.125s	_0.149s	_{p=0.524 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.795s (± 0.77%)}	_{0.793s (± 0.54%)}	_~	_0.777s	_0.811s	_{p=0.606 n=20}
_{Emit Time}	_{0.141s (± 1.89%)}	_{0.141s (± 1.83%)}	_~	_0.133s	_0.153s	_{p=0.762 n=20}
_{Total Time}	_{9.277s (± 0.51%)}	_{9.256s (± 0.45%)}	_~	_9.040s	_9.425s	_{p=0.995 n=20}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_263,481	_263,481	_~	_~	_~	_{p=1.000 n=20}
_Types	_196,103	_188,463	_{🟩-7,640 (- 3.90%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{221,524k (± 0.02%)}	_{219,667k (± 0.02%)}	_{-1,857k (- 0.84%)}	_219,482k	_219,833k	_{p=0.000 n=20}
_{Memory Allocs}	_{2,388,733 (± 0.01%)}	_{2,370,843 (± 0.01%)}	_{-17,890 (- 0.75%)}	_2,369,652	_2,372,107	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.046s (± 3.49%)}	_{0.047s (± 3.10%)}	_~	_0.042s	_0.053s	_{p=0.173 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.386s (± 0.64%)}	_{0.386s (± 0.59%)}	_~	_0.379s	_0.397s	_{p=0.825 n=20}
_{Emit Time}	_{0.047s (± 5.57%)}	_{0.047s (± 5.16%)}	_~	_0.041s	_0.056s	_{p=0.866 n=20}
_{Total Time}	_{0.507s (± 0.54%)}	_{0.508s (± 0.59%)}	_~	_0.499s	_0.521s	_{p=0.432 n=20}
_{t3code-server - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,349,937	_4,349,937	_~	_~	_~	_{p=1.000 n=20}
_Types	_3,042,465	_2,959,771	_{-82,694 (- 2.72%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{2,395,197k (± 0.01%)}	_{2,377,210k (± 0.03%)}	_{-17,987k (- 0.75%)}	_2,375,336k	_2,379,594k	_{p=0.000 n=20}
_{Memory Allocs}	_{37,117,576 (± 0.05%)}	_{36,976,287 (± 0.07%)}	_{-141,289 (- 0.38%)}	_36,876,064	_37,107,569	_{p=0.000 n=20}
_{Config Time}	_{0.003s (± 4.95%)}	_{0.003s (± 6.84%)}	_~	_0.002s	_0.003s	_{p=0.661 n=20}
_{Parse Time}	_{0.256s (± 2.25%)}	_{0.260s (± 3.07%)}	_~	_0.219s	_0.299s	_{p=0.364 n=20}
_{Bind Time}	_{0.085s (± 7.88%)}	_{0.082s (± 8.59%)}	_~	_0.072s	_0.130s	_{p=0.211 n=20}
_{Check Time}	_{6.091s (± 1.00%)}	_{5.986s (± 1.38%)}	_~	_5.718s	_6.339s	_{p=0.063 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{6.447s (± 0.97%)}	_{6.341s (± 1.31%)}	_~	_6.072s	_6.690s	_{p=0.056 n=20}
_{tanstack-router - native}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_570,149	_570,149	_~	_~	_~	_{p=1.000 n=20}
_Types	_396,551	_394,260	_{-2,291 (- 0.58%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{315,288k (± 0.01%)}	_{314,815k (± 0.02%)}	_{-473k (- 0.15%)}	_314,560k	_315,053k	_{p=0.000 n=20}
_{Memory Allocs}	_{4,324,526 (± 0.11%)}	_{4,324,765 (± 0.15%)}	_~	_4,307,434	_4,355,451	_{p=0.883 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.044s (± 4.36%)}	_{0.044s (± 4.37%)}	_~	_0.037s	_0.052s	_{p=0.804 n=20}
_{Bind Time}	_{0.016s (±11.68%)}	_{0.017s (±11.73%)}	_~	_0.012s	_0.025s	_{p=0.555 n=20}
_{Check Time}	_{0.509s (± 1.29%)}	_{0.515s (± 1.79%)}	_~	_0.486s	_0.568s	_{p=0.261 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.588s (± 1.39%)}	_{0.595s (± 1.92%)}	_~	_0.562s	_0.659s	_{p=0.402 n=20}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_231,607	_231,607	_~	_~	_~	_{p=1.000 n=20}
_Types	_181,163	_173,699	_{🟩-7,464 (- 4.12%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{190,849k (± 0.02%)}	_{189,019k (± 0.02%)}	_{-1,830k (- 0.96%)}	_188,814k	_189,150k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,310,083 (± 0.02%)}	_{1,292,427 (± 0.01%)}	_{-17,657 (- 1.35%)}	_1,291,844	_1,293,114	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.043s (± 3.05%)}	_{0.042s (± 3.67%)}	_~	_0.037s	_0.050s	_{p=0.172 n=20}
_{Bind Time}	_{0.022s (±11.40%)}	_{0.021s (± 5.51%)}	_~	_0.017s	_0.026s	_{p=0.450 n=20}
_{Check Time}	_{0.292s (± 1.74%)}	_{0.291s (± 1.49%)}	_~	_0.279s	_0.320s	_{p=0.693 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.364s (± 2.22%)}	_{0.362s (± 1.53%)}	_~	_0.345s	_0.402s	_{p=0.615 n=20}
_{vscode - native}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_7,869,551	_7,869,551	_~	_~	_~	_{p=1.000 n=20}
_Types	_4,611,927	_4,387,196	_{🟩-224,731 (- 4.87%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{5,295,119k (± 0.02%)}	_{5,245,036k (± 0.02%)}	_{-50,083k (- 0.95%)}	_5,241,110k	_5,249,802k	_{p=0.000 n=20}
_{Memory Allocs}	_{59,248,124 (± 0.02%)}	_{58,747,898 (± 0.03%)}	_{-500,226 (- 0.84%)}	_58,715,603	_58,840,298	_{p=0.000 n=20}
_{Config Time}	_{0.037s (± 1.87%)}	_{0.036s (± 1.27%)}	_~	_0.035s	_0.040s	_{p=0.682 n=20}
_{Parse Time}	_{0.967s (± 1.99%)}	_{0.963s (± 1.47%)}	_~	_0.905s	_1.032s	_{p=0.625 n=20}
_{Bind Time}	_{0.344s (± 5.20%)}	_{0.345s (± 3.57%)}	_~	_0.317s	_0.418s	_{p=0.846 n=20}
_{Check Time}	_{7.556s (± 0.85%)}	_{7.539s (± 0.86%)}	_~	_7.223s	_7.768s	_{p=0.753 n=20}
_{Emit Time}	_{2.190s (± 5.36%)}	_{2.270s (± 7.57%)}	_~	_2.042s	_3.198s	_{p=0.654 n=20}
_{Total Time}	_{11.155s (± 1.12%)}	_{11.221s (± 1.32%)}	_~	_10.951s	_12.034s	_{p=0.693 n=20}
_{webpack - native}
_Errors	₆₁₅	₆₁₅	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_883,161	_883,161	_~	_~	_~	_{p=1.000 n=20}
_Types	_621,386	_599,301	_{🟩-22,085 (- 3.55%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{645,792k (± 0.02%)}	_{641,167k (± 0.02%)}	_{-4,625k (- 0.72%)}	_640,583k	_641,666k	_{p=0.000 n=20}
_{Memory Allocs}	_{6,053,721 (± 0.07%)}	_{6,000,954 (± 0.05%)}	_{-52,767 (- 0.87%)}	_5,990,886	_6,011,779	_{p=0.000 n=20}
_{Config Time}	_0.004s	_0.004s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.123s (± 1.96%)}	_{0.126s (± 2.46%)}	_~	_0.110s	_0.137s	_{p=0.106 n=20}
_{Bind Time}	_{0.038s (± 5.84%)}	_{0.040s (±10.29%)}	_~	_0.032s	_0.066s	_{p=0.661 n=20}
_{Check Time}	_{1.027s (± 0.95%)}	_{1.030s (± 1.05%)}	_~	_0.989s	_1.084s	_{p=0.597 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.216s (± 0.86%)}	_{1.222s (± 0.95%)}	_~	_1.187s	_1.280s	_{p=0.441 n=20}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_644,330	_644,330	_~	_~	_~	_{p=1.000 n=20}
_Types	_392,175	_389,191	_{-2,984 (- 0.76%)}	_~	_~	_{p=0.000 n=20}
_{Memory Used}	_{347,014k (± 0.03%)}	_{346,277k (± 0.02%)}	_{-737k (- 0.21%)}	_346,025k	_346,568k	_{p=0.000 n=20}
_{Memory Allocs}	_{3,998,564 (± 0.06%)}	_{3,994,001 (± 0.07%)}	_{-4,563 (- 0.11%)}	_3,981,791	_4,003,245	_{p=0.021 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.060s (± 2.76%)}	_{0.060s (± 2.97%)}	_~	_0.055s	_0.068s	_{p=0.752 n=20}
_{Bind Time}	_{0.021s (±11.19%)}	_{0.022s (±13.38%)}	_~	_0.017s	_0.034s	_{p=0.555 n=20}
_{Check Time}	_{0.428s (± 1.04%)}	_{0.436s (± 2.24%)}	_~	_0.414s	_0.494s	_{p=0.297 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.516s (± 1.13%)}	_{0.525s (± 1.74%)}	_~	_0.496s	_0.577s	_{p=0.075 n=20}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
arktype - native
class-transformer - native
effect - native
mui-docs - native
sentry - native
social-app - native
strada-build-src - native
strada-compiler - native
t3code-server - native
tanstack-router - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₂₀
_Baseline	_baseline	₂₀

Developer Information:

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Daniel Rosenwasser (DanielRosenwasser) · 2026-11-06T18:53:57Z

+	// A method is typed as a function type only when none of the flags getTypeOfSymbol checks before it are set
+	if prop.Flags()&(ast.SymbolFlagsMethod|ast.SymbolFlagsAccessor|ast.SymbolFlagsVariable|ast.SymbolFlagsProperty) == ast.SymbolFlagsMethod {
+		return false
+	}


Why is this not just an early bailout on if prop.Flags()&ast.SymbolFlagsMethod == 0? Why do the other symbol types carve out exceptions?

they were not needed, I simplified this now - the only flag trily coexisting with ast.SymbolFlagsMethod is ast.SymbolFlagsProperty. And even then the symbol is still a method and thus not a unit type so the bailout is safe

Daniel Rosenwasser (DanielRosenwasser) · 2026-11-06T18:55:01Z

 	return ""
 }

+// Reports whether a property has a unit type, without resolving the types of methods, which are function types, or


The comment is slightly misleading, right? You may still resolve the type.

Avoid resolving property types that cannot be unit types when looking…

ae1bf6f

… for key properties

typescript-automation Bot added the For Uncommitted Bug PR for untriaged, rejected, closed or missing bug label Oct 30, 2026

Jake Bailey (jakebailey) added the Domain: Performance Performance related label Oct 30, 2026

Jake Bailey (jakebailey) requested a balanced review from Copilot October 30, 2026 17:03

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Comment thread tsc/internal/checker/relater.go Resolved

Keep resolving properties whose uninstantiated type has a generic tup…

ada8132

…le that can normalize to never

Mateusz Burzyński (Andarist) requested a balanced review from Copilot November 2, 2026 15:18

Copilot started reviewing on behalf of Mateusz Burzyński (Andarist) November 2, 2026 15:20

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Mateusz Burzyński (Andarist) changed the title ~~[experiment] Avoid resolving property types that cannot be unit types when looking for key properties~~ Avoid resolving property types that cannot be unit types when looking for key properties Nov 2, 2026

Mateusz Burzyński (Andarist) marked this pull request as ready for review November 2, 2026 16:09

Mateusz Burzyński (Andarist) mentioned this pull request Nov 3, 2026

[experiment] Skip incompatible discriminants when inferring #64695

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Daniel Rosenwasser (DanielRosenwasser) reviewed Nov 6, 2026

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Address review feedback on isPropertyOfUnitType

4e3289e

Skip every method when looking for unit-typed properties

a0d3905

Mateusz Burzyński (Andarist) requested a review from Daniel Rosenwasser (DanielRosenwasser) November 9, 2026 14:59

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Mateusz Burzyński (Andarist) commented Oct 30, 2026

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tsc

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tsc

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tsc

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