Replace replaceable indexed accesses early to reuse cache entries #62822

Andarist · 2025-12-02T11:32:57Z

replaceIndexedAccess was introduced in #42485 . While I was investigating some other things, it occurred to me that it could possibly be used earlier. Everything stated in this comment should still apply to the creation of the reverse-mapped type object itself

typescript-bot · 2025-12-02T11:33:01Z

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

jakebailey · 2025-12-02T13:52:29Z

@typescript-bot test it

typescript-bot · 2025-12-02T13:52:33Z

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 · 2025-12-02T14:16:47Z

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

Everything looks the same!

You can check the log here.

typescript-bot · 2025-12-02T14:22:06Z

@jakebailey Here are the results of running the user tests with tsc comparing main and refs/pull/62822/merge:

There were infrastructure failures potentially unrelated to your change:

1 instance of "Git clone failed"

Otherwise...

Everything looks good!

typescript-bot · 2025-12-02T14:44:58Z

@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}	_{194,966k (± 0.93%)}	_{193,290k (± 0.74%)}	_~	_192,601k	_196,208k	_{p=0.093 n=6}
_{Parse Time}	_{1.30s (± 0.64%)}	_{1.31s (± 0.39%)}	_~	_1.30s	_1.31s	_{p=0.923 n=6}
_{Bind Time}	_0.75s	_0.75s	_~	_~	_~	_{p=1.000 n=6}
_{Check Time}	_{9.93s (± 0.45%)}	_{9.91s (± 0.23%)}	_~	_9.89s	_9.95s	_{p=0.808 n=6}
_{Emit Time}	_{2.73s (± 0.44%)}	_{2.74s (± 0.64%)}	_~	_2.71s	_2.76s	_{p=0.933 n=6}
_{Total Time}	_{14.72s (± 0.30%)}	_{14.71s (± 0.17%)}	_~	_14.68s	_14.75s	_{p=0.746 n=6}
_{angular-1 - node (v18.15.0, x64)}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_956,047	_956,082	_{+35 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_415,881	_415,888	_{+7 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{1,255,064k (± 0.00%)}	_{1,255,048k (± 0.00%)}	_~	_1,254,989k	_1,255,109k	_{p=0.810 n=6}
_{Parse Time}	_{6.55s (± 0.76%)}	_{6.55s (± 0.41%)}	_~	_6.50s	_6.58s	_{p=1.000 n=6}
_{Bind Time}	_{1.96s (± 0.32%)}	_{1.96s (± 0.21%)}	_~	_1.95s	_1.96s	_{p=0.673 n=6}
_{Check Time}	_{32.34s (± 0.19%)}	_{32.39s (± 0.44%)}	_~	_32.18s	_32.60s	_{p=0.378 n=6}
_{Emit Time}	_{14.86s (± 0.19%)}	_{14.85s (± 0.23%)}	_~	_14.79s	_14.88s	_{p=0.686 n=6}
_{Total Time}	_{55.70s (± 0.15%)}	_{55.74s (± 0.23%)}	_~	_55.60s	_55.93s	_{p=0.936 n=6}
_{mui-docs - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_2,722,079	_2,722,079	_~	_~	_~	_{p=1.000 n=6}
_Types	_937,469	_937,469	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,050,885k (± 0.00%)}	_{3,050,838k (± 0.00%)}	_~	_3,050,761k	_3,050,883k	_{p=0.173 n=6}
_{Parse Time}	_{8.54s (± 0.16%)}	_{8.54s (± 0.18%)}	_~	_8.51s	_8.55s	_{p=0.805 n=6}
_{Bind Time}	_{2.32s (± 0.59%)}	_{2.32s (± 0.71%)}	_~	_2.30s	_2.34s	_{p=0.934 n=6}
_{Check Time}	_{93.15s (± 0.53%)}	_{92.79s (± 0.42%)}	_~	_92.38s	_93.26s	_{p=0.230 n=6}
_{Emit Time}	_{0.31s (± 1.32%)}	_{0.31s (± 1.68%)}	_~	_0.30s	_0.31s	_{p=0.595 n=6}
_{Total Time}	_{104.32s (± 0.48%)}	_{103.96s (± 0.38%)}	_~	_103.57s	_104.45s	_{p=0.296 n=6}
_{self-build-src - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,251,545	_1,251,544	_{-1 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_259,756	_259,756	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{2,574,799k (±11.81%)}	_{2,392,915k (± 0.02%)}	_~	_2,392,323k	_2,393,622k	_{p=0.378 n=6}
_{Parse Time}	_{5.20s (± 1.52%)}	_{5.16s (± 0.74%)}	_~	_5.12s	_5.22s	_{p=0.423 n=6}
_{Bind Time}	_{1.82s (± 1.68%)}	_{1.84s (± 1.27%)}	_~	_1.81s	_1.87s	_{p=0.256 n=6}
_{Check Time}	_{35.45s (± 0.64%)}	_{35.46s (± 0.30%)}	_~	_35.34s	_35.60s	_{p=0.936 n=6}
_{Emit Time}	_{3.01s (± 2.37%)}	_{3.01s (± 2.33%)}	_~	_2.92s	_3.10s	_{p=0.936 n=6}
_{Total Time}	_{45.49s (± 0.48%)}	_{45.47s (± 0.38%)}	_~	_45.23s	_45.70s	_{p=0.936 n=6}
_{self-build-src-public-api - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,251,545	_1,251,544	_{-1 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_259,756	_259,756	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,187,454k (± 0.02%)}	_{3,187,815k (± 0.01%)}	_~	_3,187,064k	_3,188,201k	_{p=0.471 n=6}
_{Parse Time}	_{6.82s (± 0.79%)}	_{6.82s (± 1.06%)}	_~	_6.69s	_6.87s	_{p=0.748 n=6}
_{Bind Time}	_{2.26s (± 0.91%)}	_{2.25s (± 1.36%)}	_~	_2.21s	_2.29s	_{p=0.471 n=6}
_{Check Time}	_{43.16s (± 0.40%)}	_{43.12s (± 0.27%)}	_~	_42.92s	_43.23s	_{p=0.936 n=6}
_{Emit Time}	_{3.51s (± 3.09%)}	_{3.51s (± 2.00%)}	_~	_3.38s	_3.57s	_{p=0.936 n=6}
_{Total Time}	_{55.76s (± 0.40%)}	_{55.69s (± 0.11%)}	_~	_55.62s	_55.78s	_{p=0.378 n=6}
_{self-compiler - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_264,177	_264,176	_{-1 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_103,979	_103,979	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{443,204k (± 0.01%)}	_{443,241k (± 0.02%)}	_~	_443,150k	_443,347k	_{p=0.378 n=6}
_{Parse Time}	_{3.52s (± 0.53%)}	_{3.52s (± 0.73%)}	_~	_3.49s	_3.55s	_{p=0.871 n=6}
_{Bind Time}	_{1.38s (± 1.29%)}	_{1.37s (± 1.19%)}	_~	_1.35s	_1.39s	_{p=0.512 n=6}
_{Check Time}	_{19.15s (± 0.44%)}	_{19.16s (± 0.48%)}	_~	_19.00s	_19.28s	_{p=0.872 n=6}
_{Emit Time}	_{1.54s (± 1.36%)}	_{1.53s (± 0.58%)}	_~	_1.52s	_1.54s	_{p=0.563 n=6}
_{Total Time}	_{25.59s (± 0.32%)}	_{25.58s (± 0.34%)}	_~	_25.41s	_25.64s	_{p=1.000 n=6}
_{ts-pre-modules - node (v18.15.0, x64)}
_Errors	₇₂	₇₂	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_225,386	_225,386	_~	_~	_~	_{p=1.000 n=6}
_Types	_94,304	_94,304	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{370,098k (± 0.04%)}	_{370,074k (± 0.04%)}	_~	_369,939k	_370,374k	_{p=0.936 n=6}
_{Parse Time}	_{2.83s (± 1.17%)}	_{2.85s (± 0.75%)}	_~	_2.81s	_2.87s	_{p=0.466 n=6}
_{Bind Time}	_{1.63s (± 0.51%)}	_{1.65s (± 1.38%)}	_~	_1.63s	_1.69s	_{p=0.277 n=6}
_{Check Time}	_{16.61s (± 0.15%)}	_{16.60s (± 0.68%)}	_~	_16.39s	_16.72s	_{p=0.688 n=6}
_{Emit Time}	_0.00s	_{0.00s (±154.76%)}	_~	_0.00s	_0.01s	_{p=0.174 n=6}
_{Total Time}	_{21.08s (± 0.11%)}	_{21.10s (± 0.58%)}	_~	_20.89s	_21.23s	_{p=0.378 n=6}
_{vscode - node (v18.15.0, x64)}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_4,072,930	_4,072,930	_~	_~	_~	_{p=1.000 n=6}
_Types	_1,282,754	_1,282,754	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,858,265k (± 0.00%)}	_{3,858,428k (± 0.00%)}	_{+164k (+ 0.00%)}	_3,858,310k	_3,858,683k	_{p=0.008 n=6}
_{Parse Time}	_{15.70s (± 0.65%)}	_{15.67s (± 0.58%)}	_~	_15.58s	_15.79s	_{p=0.748 n=6}
_{Bind Time}	_{5.39s (± 3.24%)}	_{5.34s (± 2.31%)}	_~	_5.19s	_5.56s	_{p=0.936 n=6}
_{Check Time}	_{112.41s (± 2.56%)}	_{111.48s (± 0.95%)}	_~	_110.36s	_113.46s	_{p=0.748 n=6}
_{Emit Time}	_{40.19s (± 5.78%)}	_{41.32s (±11.12%)}	_~	_38.72s	_50.52s	_{p=1.000 n=6}
_{Total Time}	_{173.70s (± 2.92%)}	_{173.82s (± 2.47%)}	_~	_171.02s	_182.30s	_{p=0.936 n=6}
_{webpack - node (v18.15.0, x64)}
_Errors	₄₀	₄₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_380,455	_380,455	_~	_~	_~	_{p=1.000 n=6}
_Types	_166,708	_166,708	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{540,348k (± 0.03%)}	_{540,380k (± 0.01%)}	_~	_540,323k	_540,441k	_{p=0.575 n=6}
_{Parse Time}	_{4.67s (± 0.35%)}	_{4.68s (± 0.39%)}	_~	_4.66s	_4.71s	_{p=0.563 n=6}
_{Bind Time}	_{2.03s (± 1.83%)}	_{2.04s (± 1.26%)}	_~	_2.02s	_2.08s	_{p=0.627 n=6}
_{Check Time}	_{22.91s (± 0.33%)}	_{22.92s (± 0.43%)}	_~	_22.73s	_23.01s	_{p=0.518 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{29.62s (± 0.36%)}	_{29.65s (± 0.36%)}	_~	_29.45s	_29.74s	_{p=0.574 n=6}
_{xstate-main - node (v18.15.0, x64)}
_Errors	₃₀	₃₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_690,447	_690,447	_~	_~	_~	_{p=1.000 n=6}
_Types	_208,639	_208,639	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{586,405k (± 0.03%)}	_{586,454k (± 0.02%)}	_~	_586,240k	_586,626k	_{p=0.748 n=6}
_{Parse Time}	_{4.17s (± 0.53%)}	_{4.17s (± 0.86%)}	_~	_4.13s	_4.21s	_{p=0.935 n=6}
_{Bind Time}	_{1.41s (± 1.76%)}	_{1.41s (± 1.15%)}	_~	_1.39s	_1.44s	_{p=0.624 n=6}
_{Check Time}	_{20.85s (± 1.67%)}	_{20.73s (± 1.25%)}	_~	_20.55s	_21.25s	_{p=0.748 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{26.43s (± 1.39%)}	_{26.31s (± 0.95%)}	_~	_26.17s	_26.81s	_{p=0.872 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:

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typescript-bot · 2025-12-02T15:18:15Z

@jakebailey Here are the results of running the top 400 repos with tsc comparing main and refs/pull/62822/merge:

Everything looks good!

Replace replaceable indexed accesses early to reuse cache entries

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github-project-automation bot added this to PR Backlog Dec 2, 2025

github-project-automation bot moved this to Not started in PR Backlog Dec 2, 2025

typescript-bot added the For Uncommitted Bug PR for untriaged, rejected, closed or missing bug label Dec 2, 2025

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Replace replaceable indexed accesses early to reuse cache entries #62822

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