Derive tuple labels for rest elements from array binding patterns #59045

rbuckton · 2024-06-26T22:35:57Z

While working on #58243, a community member asked if we could label the tuple we use to properly type arguments to the next() methods of iterators and generators. A brief experiment showed that directly labeling the tuple element resulted in the creation of thousands of new types in some tests since iterator/generator instantiations would produce new named tuple elements since named tuple elements are cached far less frequently.

An alternative to that approach would be to use an additional source for the label when the label comes from a rest parameter whose name is actually an ArrayBindingPattern:

declare function a(...args: [] | [number]): void;
a(1); // quickinfo shows `(args_0: number)`

declare function b(...[value] : [] | [number]): void;
b(1); // quickinfo now shows `(value: number)`
      // quickinfo previously showed `(__0_0: number)`

Since this is merely treated as an additional labeling source, there is no need to synthesize additional types for named tuple elements.

Related #58243 (comment)

DanielRosenwasser · 2024-06-27T01:11:52Z

@typescript-bot test it

typescript-bot · 2024-06-27T01:11:56Z

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 · 2024-06-27T01:33:35Z

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

Everything looks the same!

You can check the log here.

typescript-bot · 2024-06-27T01:38:39Z

@DanielRosenwasser Here are the results of running the user tests with tsc comparing main and refs/pull/59045/merge:

Everything looks good!

typescript-bot · 2024-06-27T01:47:33Z

@DanielRosenwasser
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	₃₀	₃₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_62,153	_62,153	_~	_~	_~	_{p=1.000 n=6}
_Types	_50,242	_50,242	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{192,789k (± 0.75%)}	_{192,789k (± 0.73%)}	_~	_192,133k	_195,637k	_{p=0.575 n=6}
_{Parse Time}	_{1.31s (± 0.57%)}	_{1.30s (± 1.05%)}	_~	_1.28s	_1.32s	_{p=0.273 n=6}
_{Bind Time}	_0.71s	_0.71s	_~	_~	_~	_{p=1.000 n=6}
_{Check Time}	_{9.44s (± 0.38%)}	_{9.44s (± 0.69%)}	_~	_9.38s	_9.55s	_{p=0.936 n=6}
_{Emit Time}	_{2.75s (± 0.83%)}	_{2.74s (± 1.37%)}	_~	_2.67s	_2.78s	_{p=1.000 n=6}
_{Total Time}	_{14.21s (± 0.30%)}	_{14.20s (± 0.24%)}	_~	_14.17s	_14.25s	_{p=0.744 n=6}
_{angular-1 - node (v18.15.0, x64)}
_Errors	₅	₅	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_944,114	_944,114	_~	_~	_~	_{p=1.000 n=6}
_Types	_407,050	_407,050	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{1,218,382k (± 0.00%)}	_{1,218,347k (± 0.00%)}	_~	_1,218,275k	_1,218,373k	_{p=0.335 n=6}
_{Parse Time}	_{6.67s (± 0.74%)}	_{6.66s (± 0.92%)}	_~	_6.59s	_6.76s	_{p=0.809 n=6}
_{Bind Time}	_{1.87s (± 0.55%)}	_{1.87s (± 0.56%)}	_~	_1.85s	_1.88s	_{p=0.801 n=6}
_{Check Time}	_{30.64s (± 0.19%)}	_{30.72s (± 0.29%)}	_~	_30.59s	_30.81s	_{p=0.148 n=6}
_{Emit Time}	_{13.54s (± 0.68%)}	_{13.57s (± 0.31%)}	_~	_13.52s	_13.62s	_{p=1.000 n=6}
_{Total Time}	_{52.72s (± 0.16%)}	_{52.81s (± 0.23%)}	_~	_52.65s	_52.97s	_{p=0.229 n=6}
_{mui-docs - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_2,132,386	_2,132,386	_~	_~	_~	_{p=1.000 n=6}
_Types	_926,170	_926,170	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{2,114,738k (± 0.01%)}	_{2,114,843k (± 0.01%)}	_~	_2,114,648k	_2,115,034k	_{p=0.173 n=6}
_{Parse Time}	_{9.72s (± 0.25%)}	_{9.73s (± 0.31%)}	_~	_9.70s	_9.78s	_{p=0.685 n=6}
_{Bind Time}	_{3.40s (± 0.69%)}	_{3.39s (± 0.94%)}	_~	_3.34s	_3.43s	_{p=0.683 n=6}
_{Check Time}	_{103.00s (± 0.57%)}	_{102.02s (± 1.35%)}	_~	_99.52s	_103.17s	_{p=0.173 n=6}
_{Emit Time}	_{0.19s (± 2.13%)}	_{0.19s (± 2.67%)}	_~	_0.19s	_0.20s	_{p=0.595 n=6}
_{Total Time}	_{116.31s (± 0.50%)}	_{115.33s (± 1.18%)}	_~	_112.87s	_116.46s	_{p=0.173 n=6}
_{self-build-src - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,231,640	_1,231,657	_{+17 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_261,187	_261,211	_{+24 (+ 0.01%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{2,347,576k (± 0.04%)}	_{2,347,596k (± 0.03%)}	_~	_2,346,508k	_2,348,766k	_{p=1.000 n=6}
_{Parse Time}	_{5.06s (± 0.44%)}	_{5.05s (± 0.45%)}	_~	_5.03s	_5.09s	_{p=0.810 n=6}
_{Bind Time}	_{1.93s (± 0.79%)}	_{1.93s (± 0.42%)}	_~	_1.93s	_1.95s	_{p=0.209 n=6}
_{Check Time}	_{34.05s (± 0.22%)}	_{34.16s (± 0.49%)}	_~	_33.94s	_34.38s	_{p=0.230 n=6}
_{Emit Time}	_{2.76s (± 2.56%)}	_{2.73s (± 1.95%)}	_~	_2.67s	_2.81s	_{p=0.471 n=6}
_{Total Time}	_{43.82s (± 0.30%)}	_{43.90s (± 0.41%)}	_~	_43.72s	_44.16s	_{p=0.689 n=6}
_{self-build-src-public-api - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,231,640	_1,231,657	_{+17 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_261,187	_261,211	_{+24 (+ 0.01%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{2,424,424k (± 0.06%)}	_{2,423,830k (± 0.02%)}	_~	_2,423,060k	_2,424,766k	_{p=0.936 n=6}
_{Parse Time}	_{6.25s (± 0.61%)}	_{6.24s (± 1.16%)}	_~	_6.15s	_6.36s	_{p=0.630 n=6}
_{Bind Time}	_{2.05s (± 0.67%)}	_{2.04s (± 0.74%)}	_~	_2.01s	_2.05s	_{p=0.324 n=6}
_{Check Time}	_{40.40s (± 0.26%)}	_{40.51s (± 0.19%)}	_~	_40.40s	_40.61s	_{p=0.128 n=6}
_{Emit Time}	_{3.24s (± 2.66%)}	_{3.25s (± 2.35%)}	_~	_3.17s	_3.36s	_{p=0.873 n=6}
_{Total Time}	_{51.95s (± 0.34%)}	_{52.04s (± 0.31%)}	_~	_51.87s	_52.29s	_{p=0.422 n=6}
_{self-compiler - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_258,818	_258,835	_{+17 (+ 0.01%)}	_~	_~	_{p=0.001 n=6}
_Types	_104,842	_104,866	_{+24 (+ 0.02%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{428,204k (± 0.01%)}	_{428,303k (± 0.01%)}	_{+100k (+ 0.02%)}	_428,252k	_428,362k	_{p=0.008 n=6}
_{Parse Time}	_{3.31s (± 1.17%)}	_{3.33s (± 1.18%)}	_~	_3.30s	_3.41s	_{p=0.455 n=6}
_{Bind Time}	_{1.31s (± 1.64%)}	_{1.31s (± 1.31%)}	_~	_1.29s	_1.34s	_{p=1.000 n=6}
_{Check Time}	_{17.80s (± 0.26%)}	_{17.80s (± 0.37%)}	_~	_17.70s	_17.86s	_{p=0.872 n=6}
_{Emit Time}	_{1.36s (± 1.59%)}	_{1.38s (± 0.92%)}	_~	_1.36s	_1.39s	_{p=0.217 n=6}
_{Total Time}	_{23.79s (± 0.34%)}	_{23.82s (± 0.41%)}	_~	_23.68s	_23.95s	_{p=0.574 n=6}
_{ts-pre-modules - node (v18.15.0, x64)}
_Errors	₃₅	₃₅	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_224,565	_224,565	_~	_~	_~	_{p=1.000 n=6}
_Types	_93,734	_93,734	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{369,518k (± 0.03%)}	_{369,412k (± 0.02%)}	_~	_369,312k	_369,477k	_{p=0.093 n=6}
_{Parse Time}	_{2.78s (± 1.87%)}	_{2.77s (± 0.96%)}	_~	_2.72s	_2.80s	_{p=0.126 n=6}
_{Bind Time}	_{1.58s (± 1.03%)}	_{1.58s (± 0.67%)}	_~	_1.56s	_1.59s	_{p=0.451 n=6}
_{Check Time}	_{15.47s (± 0.32%)}	_{15.45s (± 0.39%)}	_~	_15.36s	_15.51s	_{p=0.688 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{19.84s (± 0.27%)}	_{19.79s (± 0.42%)}	_~	_19.65s	_19.87s	_{p=0.261 n=6}
_{vscode - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_2,878,579	_2,878,579	_~	_~	_~	_{p=1.000 n=6}
_Types	_975,166	_975,166	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,042,078k (± 0.00%)}	_{3,042,073k (± 0.00%)}	_~	_3,042,019k	_3,042,125k	_{p=0.936 n=6}
_{Parse Time}	_{13.54s (± 0.32%)}	_{13.59s (± 0.23%)}	_~	_13.54s	_13.63s	_{p=0.056 n=6}
_{Bind Time}	_{4.22s (± 2.03%)}	_{4.18s (± 0.21%)}	_~	_4.17s	_4.19s	_{p=0.459 n=6}
_{Check Time}	_{73.36s (± 0.39%)}	_{73.21s (± 0.27%)}	_~	_73.00s	_73.48s	_{p=0.230 n=6}
_{Emit Time}	_{23.98s (± 0.38%)}	_{23.98s (± 0.24%)}	_~	_23.91s	_24.05s	_{p=0.936 n=6}
_{Total Time}	_{115.09s (± 0.30%)}	_{114.96s (± 0.17%)}	_~	_114.79s	_115.31s	_{p=0.378 n=6}
_{webpack - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_267,117	_267,117	_~	_~	_~	_{p=1.000 n=6}
_Types	_108,775	_108,775	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{411,543k (± 0.01%)}	_{411,524k (± 0.02%)}	_~	_411,431k	_411,593k	_{p=0.810 n=6}
_{Parse Time}	_{3.19s (± 0.54%)}	_{3.19s (± 0.55%)}	_~	_3.17s	_3.22s	_{p=0.870 n=6}
_{Bind Time}	_{1.42s (± 0.59%)}	_{1.41s (± 0.37%)}	_~	_1.41s	_1.42s	_{p=0.533 n=6}
_{Check Time}	_{14.20s (± 0.37%)}	_{14.22s (± 0.51%)}	_~	_14.13s	_14.30s	_{p=0.520 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{18.80s (± 0.21%)}	_{18.83s (± 0.36%)}	_~	_18.76s	_18.91s	_{p=0.521 n=6}
_{xstate-main - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_525,251	_525,251	_~	_~	_~	_{p=1.000 n=6}
_Types	_178,574	_178,574	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{462,859k (± 0.09%)}	_{462,680k (± 0.08%)}	_~	_462,336k	_463,129k	_{p=0.471 n=6}
_{Parse Time}	_{3.17s (± 0.68%)}	_{3.16s (± 0.99%)}	_~	_3.13s	_3.21s	_{p=0.418 n=6}
_{Bind Time}	_{1.17s (± 1.14%)}	_1.17s	_~	_~	_~	_{p=0.599 n=6}
_{Check Time}	_{17.99s (± 0.24%)}	_{17.95s (± 0.33%)}	_~	_17.89s	_18.03s	_{p=0.296 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{22.34s (± 0.16%)}	_{22.28s (± 0.33%)}	_~	_22.20s	_22.38s	_{p=0.228 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 · 2024-06-27T03:03:51Z

@DanielRosenwasser Here are the results of running the top 400 repos with tsc comparing main and refs/pull/59045/merge:

Everything looks good!

Andarist · 2024-06-27T09:13:50Z

I already have a very related change to this open here. Both PRs touch the same area of the code and solve very overlapping problems, I think it would make sense to merge both

Get tuple labels for rest elements from array binding patterns

dcb41db

rbuckton requested review from weswigham and ahejlsberg June 26, 2024 22:35

typescript-bot assigned rbuckton Jun 26, 2024

typescript-bot added Author: Team For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Jun 26, 2024

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Derive tuple labels for rest elements from array binding patterns #59045

Derive tuple labels for rest elements from array binding patterns #59045

rbuckton commented Jun 26, 2024 •

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tsc

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Andarist commented Jun 27, 2024

Derive tuple labels for rest elements from array binding patterns #59045

Are you sure you want to change the base?

Derive tuple labels for rest elements from array binding patterns #59045

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tsc

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