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Apply contextual type to empty array literals #47898

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Apply contextual type to empty array literals #47898

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Just an experiment

@typescript-bot typescript-bot added Author: Team For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Feb 14, 2022
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@typescript-bot test this
@typescript-bot user test this
@typescript-bot pack this

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typescript-bot commented Feb 14, 2022 •
edited

Heya @RyanCavanaugh, I've started to run the tarball bundle task on this PR at 62c8ae1. You can monitor the build here.

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typescript-bot commented Feb 14, 2022 •
edited

Heya @RyanCavanaugh, I've started to run the parallelized community code test suite on this PR at 62c8ae1. You can monitor the build here.

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typescript-bot commented Feb 14, 2022 •
edited

Heya @RyanCavanaugh, I've started to run the extended test suite on this PR at 62c8ae1. You can monitor the build here.

@typescript-bot typescript-bot mentioned this pull request Feb 14, 2022
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The user suite test run you requested has finished and failed. I've opened a PR with the baseline diff from master.

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@typescript-bot test this
@typescript-bot user test this
@typescript-bot pack this
@typescript-bot perf test this faster

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typescript-bot commented Feb 15, 2022 •
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Heya @RyanCavanaugh, I've started to run the parallelized community code test suite on this PR at 6c8f308. You can monitor the build here.

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typescript-bot commented Feb 15, 2022 •
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Heya @RyanCavanaugh, I've started to run the tarball bundle task on this PR at 6c8f308. You can monitor the build here.

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typescript-bot commented Feb 15, 2022 •
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Heya @RyanCavanaugh, I've started to run the extended test suite on this PR at 6c8f308. You can monitor the build here.

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typescript-bot commented Feb 15, 2022 •
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Heya @RyanCavanaugh, I've started to run the perf test suite on this PR at 6c8f308. You can monitor the build here.

Update: The results are in!

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typescript-bot commented Feb 15, 2022 •
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Heya @RyanCavanaugh, I've started to run the abridged perf test suite on this PR at 6c8f308. You can monitor the build here.

Update: The results are in!

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typescript-bot commented Feb 15, 2022 •
edited

Hey @RyanCavanaugh, I've packed this into an installable tgz. You can install it for testing by referencing it in your package.json like so:

{
    "devDependencies": {
        "typescript": "https://typescript.visualstudio.com/cf7ac146-d525-443c-b23c-0d58337efebc/_apis/build/builds/120057/artifacts?artifactName=tgz&fileId=CCD48A85A5D92B1B5A0BA4D63641EB7AF68C7237F98BD01B4F44342737A5230202&fileName=/typescript-4.7.0-insiders.20220215.tgz"
    }
}

and then running npm install.

There is also a playground for this build and an npm module you can use via "typescript": "npm:@typescript-deploys/pr-build@4.7.0-pr-47898-11".;

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The results of the perf run you requested are in!

Here they are:

Comparison Report - main..47898

Metric main 47898 Delta Best Worst
Angular - node (v10.16.3, x64)
Memory used 356,633k (± 0.02%) 356,643k (± 0.02%) +10k (+ 0.00%) 356,417k 356,782k
Parse Time 1.95s (± 0.46%) 1.96s (± 0.46%) +0.01s (+ 0.41%) 1.95s 1.99s
Bind Time 0.86s (± 0.80%) 0.86s (± 0.69%) 0.00s ( 0.00%) 0.84s 0.87s
Check Time 5.71s (± 0.72%) 5.72s (± 0.52%) +0.01s (+ 0.25%) 5.67s 5.80s
Emit Time 5.93s (± 0.72%) 5.93s (± 0.67%) +0.00s (+ 0.07%) 5.87s 6.05s
Total Time 14.44s (± 0.55%) 14.46s (± 0.50%) +0.02s (+ 0.15%) 14.37s 14.71s
Compiler-Unions - node (v10.16.3, x64)
Memory used 204,383k (± 0.03%) 204,349k (± 0.02%) -34k (- 0.02%) 204,237k 204,451k
Parse Time 0.79s (± 1.02%) 0.78s (± 0.87%) -0.00s (- 0.51%) 0.77s 0.80s
Bind Time 0.52s (± 0.94%) 0.53s (± 0.95%) +0.00s (+ 0.19%) 0.51s 0.53s
Check Time 8.05s (± 0.35%) 8.04s (± 0.34%) -0.01s (- 0.07%) 8.01s 8.14s
Emit Time 2.48s (± 0.79%) 2.48s (± 1.04%) -0.00s (- 0.16%) 2.43s 2.56s
Total Time 11.84s (± 0.29%) 11.83s (± 0.35%) -0.01s (- 0.10%) 11.76s 11.93s
Monaco - node (v10.16.3, x64)
Memory used 343,189k (± 0.04%) 343,180k (± 0.02%) -9k (- 0.00%) 343,075k 343,299k
Parse Time 1.48s (± 0.46%) 1.49s (± 0.40%) +0.00s (+ 0.07%) 1.47s 1.50s
Bind Time 0.75s (± 0.53%) 0.76s (± 0.77%) +0.01s (+ 0.80%) 0.74s 0.77s
Check Time 5.62s (± 0.49%) 5.65s (± 0.79%) +0.03s (+ 0.48%) 5.59s 5.79s
Emit Time 3.23s (± 0.78%) 3.23s (± 0.79%) 0.00s ( 0.00%) 3.18s 3.30s
Total Time 11.09s (± 0.28%) 11.12s (± 0.42%) +0.04s (+ 0.33%) 11.05s 11.24s
TFS - node (v10.16.3, x64)
Memory used 304,951k (± 0.02%) 304,986k (± 0.03%) +34k (+ 0.01%) 304,811k 305,311k
Parse Time 1.20s (± 0.56%) 1.19s (± 0.57%) -0.00s (- 0.17%) 1.18s 1.21s
Bind Time 0.72s (± 0.80%) 0.71s (± 0.48%) -0.01s (- 0.97%) 0.71s 0.72s
Check Time 5.16s (± 0.41%) 5.15s (± 0.50%) -0.00s (- 0.08%) 5.09s 5.22s
Emit Time 3.41s (± 1.08%) 3.36s (± 0.78%) -0.05s (- 1.49%) 3.30s 3.43s
Total Time 10.49s (± 0.56%) 10.43s (± 0.43%) -0.06s (- 0.58%) 10.33s 10.52s
material-ui - node (v10.16.3, x64)
Memory used 472,073k (± 0.02%) 472,025k (± 0.01%) -48k (- 0.01%) 471,920k 472,197k
Parse Time 1.78s (± 0.50%) 1.78s (± 0.27%) +0.00s (+ 0.06%) 1.77s 1.79s
Bind Time 0.67s (± 1.31%) 0.66s (± 0.91%) -0.01s (- 2.09%) 0.64s 0.67s
Check Time 14.32s (± 0.46%) 14.36s (± 0.47%) +0.04s (+ 0.27%) 14.24s 14.50s
Emit Time 0.00s (± 0.00%) 0.00s (± 0.00%) 0.00s ( NaN%) 0.00s 0.00s
Total Time 16.77s (± 0.41%) 16.80s (± 0.42%) +0.03s (+ 0.18%) 16.66s 16.93s
xstate - node (v10.16.3, x64)
Memory used 570,728k (± 0.02%) 570,750k (± 0.02%) +23k (+ 0.00%) 570,514k 570,953k
Parse Time 2.55s (± 0.33%) 2.56s (± 0.43%) +0.01s (+ 0.24%) 2.53s 2.58s
Bind Time 1.01s (± 0.82%) 1.02s (± 0.67%) +0.00s (+ 0.20%) 1.00s 1.03s
Check Time 1.52s (± 0.43%) 1.52s (± 0.59%) +0.00s (+ 0.20%) 1.50s 1.54s
Emit Time 0.07s (± 3.14%) 0.07s (± 0.00%) -0.00s (- 1.41%) 0.07s 0.07s
Total Time 5.15s (± 0.17%) 5.16s (± 0.37%) +0.01s (+ 0.21%) 5.12s 5.20s
Angular - node (v12.1.0, x64)
Memory used 334,134k (± 0.10%) 334,337k (± 0.01%) +203k (+ 0.06%) 334,248k 334,413k
Parse Time 1.95s (± 0.73%) 1.94s (± 0.57%) -0.01s (- 0.46%) 1.93s 1.98s
Bind Time 0.84s (± 0.62%) 0.84s (± 0.70%) +0.00s (+ 0.36%) 0.83s 0.86s
Check Time 5.53s (± 0.39%) 5.50s (± 0.41%) -0.02s (- 0.42%) 5.44s 5.55s
Emit Time 6.21s (± 1.02%) 6.21s (± 0.92%) -0.00s (- 0.08%) 6.10s 6.37s
Total Time 14.53s (± 0.46%) 14.50s (± 0.52%) -0.04s (- 0.24%) 14.37s 14.69s
Compiler-Unions - node (v12.1.0, x64)
Memory used 191,719k (± 0.15%) 191,905k (± 0.03%) +186k (+ 0.10%) 191,764k 192,022k
Parse Time 0.78s (± 1.05%) 0.78s (± 0.71%) +0.00s (+ 0.13%) 0.77s 0.79s
Bind Time 0.53s (± 1.25%) 0.53s (± 0.92%) +0.00s (+ 0.19%) 0.52s 0.54s
Check Time 7.53s (± 0.31%) 7.53s (± 0.56%) -0.00s (- 0.01%) 7.47s 7.66s
Emit Time 2.53s (± 0.87%) 2.49s (± 0.79%) -0.03s (- 1.23%) 2.45s 2.53s
Total Time 11.37s (± 0.39%) 11.33s (± 0.49%) -0.03s (- 0.27%) 11.23s 11.48s
Monaco - node (v12.1.0, x64)
Memory used 326,201k (± 0.02%) 326,257k (± 0.02%) +56k (+ 0.02%) 326,106k 326,501k
Parse Time 1.47s (± 0.78%) 1.47s (± 0.94%) +0.00s (+ 0.07%) 1.44s 1.49s
Bind Time 0.74s (± 0.70%) 0.74s (± 0.54%) 0.00s ( 0.00%) 0.73s 0.75s
Check Time 5.51s (± 0.37%) 5.51s (± 0.48%) +0.01s (+ 0.16%) 5.45s 5.58s
Emit Time 3.23s (± 0.90%) 3.23s (± 0.80%) +0.00s (+ 0.09%) 3.17s 3.30s
Total Time 10.95s (± 0.35%) 10.96s (± 0.46%) +0.01s (+ 0.10%) 10.83s 11.08s
TFS - node (v12.1.0, x64)
Memory used 289,637k (± 0.02%) 289,695k (± 0.02%) +57k (+ 0.02%) 289,565k 289,859k
Parse Time 1.21s (± 0.66%) 1.21s (± 0.73%) -0.01s (- 0.41%) 1.19s 1.22s
Bind Time 0.70s (± 0.93%) 0.70s (± 1.00%) +0.00s (+ 0.43%) 0.69s 0.72s
Check Time 5.08s (± 0.32%) 5.11s (± 0.49%) +0.03s (+ 0.61%) 5.06s 5.17s
Emit Time 3.43s (± 0.54%) 3.46s (± 0.81%) +0.03s (+ 0.93%) 3.39s 3.51s
Total Time 10.41s (± 0.30%) 10.48s (± 0.39%) +0.06s (+ 0.61%) 10.39s 10.58s
material-ui - node (v12.1.0, x64)
Memory used 450,793k (± 0.05%) 450,831k (± 0.01%) +38k (+ 0.01%) 450,762k 450,947k
Parse Time 1.78s (± 0.57%) 1.78s (± 0.54%) -0.00s (- 0.11%) 1.76s 1.80s
Bind Time 0.64s (± 1.14%) 0.63s (± 0.78%) -0.00s (- 0.63%) 0.63s 0.65s
Check Time 12.85s (± 0.58%) 12.85s (± 0.57%) -0.00s (- 0.01%) 12.71s 13.01s
Emit Time 0.00s (± 0.00%) 0.00s (± 0.00%) 0.00s ( NaN%) 0.00s 0.00s
Total Time 15.27s (± 0.51%) 15.27s (± 0.43%) -0.01s (- 0.04%) 15.16s 15.42s
xstate - node (v12.1.0, x64)
Memory used 536,689k (± 0.01%) 536,708k (± 0.02%) +18k (+ 0.00%) 536,465k 537,009k
Parse Time 2.49s (± 0.61%) 2.50s (± 0.38%) +0.00s (+ 0.16%) 2.47s 2.51s
Bind Time 1.05s (± 0.47%) 1.05s (± 0.63%) +0.00s (+ 0.38%) 1.03s 1.06s
Check Time 1.46s (± 0.56%) 1.47s (± 0.85%) +0.00s (+ 0.27%) 1.45s 1.51s
Emit Time 0.07s (± 0.00%) 0.07s (± 0.00%) 0.00s ( 0.00%) 0.07s 0.07s
Total Time 5.07s (± 0.32%) 5.08s (± 0.39%) +0.01s (+ 0.24%) 5.05s 5.14s
Angular - node (v14.15.1, x64)
Memory used 332,658k (± 0.01%) 332,712k (± 0.01%) +54k (+ 0.02%) 332,673k 332,743k
Parse Time 1.95s (± 0.42%) 1.95s (± 0.30%) +0.00s (+ 0.21%) 1.94s 1.96s
Bind Time 0.89s (± 0.37%) 0.89s (± 0.25%) +0.00s (+ 0.11%) 0.89s 0.90s
Check Time 5.52s (± 0.59%) 5.55s (± 0.56%) +0.03s (+ 0.52%) 5.50s 5.62s
Emit Time 6.20s (± 0.62%) 6.23s (± 0.92%) +0.03s (+ 0.48%) 6.11s 6.35s
Total Time 14.56s (± 0.44%) 14.62s (± 0.44%) +0.06s (+ 0.44%) 14.51s 14.75s
Compiler-Unions - node (v14.15.1, x64)
Memory used 192,117k (± 0.63%) 193,144k (± 0.49%) +1,026k (+ 0.53%) 190,537k 193,842k
Parse Time 0.81s (± 0.62%) 0.81s (± 0.45%) +0.00s (+ 0.12%) 0.80s 0.81s
Bind Time 0.56s (± 0.85%) 0.56s (± 0.59%) +0.00s (+ 0.54%) 0.55s 0.57s
Check Time 7.58s (± 0.47%) 7.61s (± 0.52%) +0.02s (+ 0.29%) 7.50s 7.67s
Emit Time 2.48s (± 0.56%) 2.48s (± 0.72%) -0.00s (- 0.16%) 2.45s 2.53s
Total Time 11.43s (± 0.37%) 11.44s (± 0.46%) +0.02s (+ 0.17%) 11.33s 11.57s
Monaco - node (v14.15.1, x64)
Memory used 324,984k (± 0.00%) 324,995k (± 0.01%) +11k (+ 0.00%) 324,945k 325,022k
Parse Time 1.50s (± 0.39%) 1.51s (± 0.60%) +0.01s (+ 0.80%) 1.49s 1.53s
Bind Time 0.77s (± 0.52%) 0.77s (± 0.29%) +0.00s (+ 0.00%) 0.76s 0.77s
Check Time 5.47s (± 0.60%) 5.43s (± 0.51%) -0.04s (- 0.64%) 5.40s 5.54s
Emit Time 3.29s (± 0.64%) 3.27s (± 0.39%) -0.02s (- 0.55%) 3.24s 3.30s
Total Time 11.02s (± 0.39%) 10.98s (± 0.36%) -0.04s (- 0.37%) 10.93s 11.12s
TFS - node (v14.15.1, x64)
Memory used 288,470k (± 0.01%) 288,482k (± 0.00%) +11k (+ 0.00%) 288,458k 288,520k
Parse Time 1.23s (± 0.59%) 1.23s (± 0.71%) -0.00s (- 0.32%) 1.21s 1.25s
Bind Time 0.74s (± 0.83%) 0.74s (± 0.65%) -0.00s (- 0.27%) 0.73s 0.75s
Check Time 5.08s (± 0.41%) 5.09s (± 0.47%) +0.00s (+ 0.08%) 5.05s 5.16s
Emit Time 3.53s (± 0.96%) 3.53s (± 1.58%) -0.00s (- 0.06%) 3.31s 3.58s
Total Time 10.58s (± 0.26%) 10.58s (± 0.48%) -0.00s (- 0.03%) 10.38s 10.64s
material-ui - node (v14.15.1, x64)
Memory used 448,912k (± 0.00%) 448,914k (± 0.01%) +2k (+ 0.00%) 448,859k 449,005k
Parse Time 1.83s (± 0.30%) 1.83s (± 0.59%) +0.00s (+ 0.16%) 1.82s 1.87s
Bind Time 0.68s (± 0.70%) 0.68s (± 0.53%) +0.00s (+ 0.15%) 0.68s 0.69s
Check Time 12.92s (± 0.53%) 13.00s (± 0.62%) +0.08s (+ 0.64%) 12.82s 13.20s
Emit Time 0.00s (± 0.00%) 0.00s (± 0.00%) 0.00s ( NaN%) 0.00s 0.00s
Total Time 15.43s (± 0.44%) 15.52s (± 0.52%) +0.09s (+ 0.57%) 15.32s 15.70s
xstate - node (v14.15.1, x64)
Memory used 534,408k (± 0.01%) 534,366k (± 0.00%) -41k (- 0.01%) 534,318k 534,432k
Parse Time 2.55s (± 0.42%) 2.55s (± 0.29%) -0.00s (- 0.04%) 2.53s 2.56s
Bind Time 1.16s (± 0.57%) 1.16s (± 0.56%) +0.00s (+ 0.17%) 1.15s 1.17s
Check Time 1.51s (± 0.31%) 1.51s (± 0.56%) +0.00s (+ 0.07%) 1.50s 1.54s
Emit Time 0.07s (± 0.00%) 0.07s (± 0.00%) 0.00s ( 0.00%) 0.07s 0.07s
Total Time 5.30s (± 0.27%) 5.30s (± 0.22%) -0.00s (- 0.08%) 5.27s 5.32s
System
Machine Namets-ci-ubuntu
Platformlinux 4.4.0-210-generic
Architecturex64
Available Memory16 GB
Available Memory6 GB
CPUs4 × Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
Hosts
  • node (v10.16.3, x64)
  • node (v12.1.0, x64)
  • node (v14.15.1, x64)
Scenarios
  • Angular - node (v10.16.3, x64)
  • Angular - node (v12.1.0, x64)
  • Angular - node (v14.15.1, x64)
  • Compiler-Unions - node (v10.16.3, x64)
  • Compiler-Unions - node (v12.1.0, x64)
  • Compiler-Unions - node (v14.15.1, x64)
  • Monaco - node (v10.16.3, x64)
  • Monaco - node (v12.1.0, x64)
  • Monaco - node (v14.15.1, x64)
  • TFS - node (v10.16.3, x64)
  • TFS - node (v12.1.0, x64)
  • TFS - node (v14.15.1, x64)
  • material-ui - node (v10.16.3, x64)
  • material-ui - node (v12.1.0, x64)
  • material-ui - node (v14.15.1, x64)
  • xstate - node (v10.16.3, x64)
  • xstate - node (v12.1.0, x64)
  • xstate - node (v14.15.1, x64)
Benchmark Name Iterations
Current 47898 10
Baseline main 10

Developer Information:

Download Benchmark

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@RyanCavanaugh
The results of the perf run you requested are in!

Here they are:

Comparison Report - main..47898

Metric main 47898 Delta Best Worst
Angular - node (v14.15.1, x64)
Memory used 332,658k (± 0.01%) 332,684k (± 0.01%) +26k (+ 0.01%) 332,610k 332,738k
Parse Time 1.95s (± 0.42%) 1.96s (± 0.44%) +0.02s (+ 0.82%) 1.94s 1.98s
Bind Time 0.89s (± 0.37%) 0.89s (± 0.73%) +0.00s (+ 0.22%) 0.88s 0.90s
Check Time 5.52s (± 0.59%) 5.56s (± 0.63%) +0.03s (+ 0.58%) 5.48s 5.63s
Emit Time 6.20s (± 0.62%) 6.23s (± 0.88%) +0.03s (+ 0.44%) 6.16s 6.43s
Total Time 14.56s (± 0.44%) 14.64s (± 0.50%) +0.08s (+ 0.53%) 14.47s 14.83s
Compiler-Unions - node (v14.15.1, x64)
Memory used 192,117k (± 0.63%) 192,801k (± 0.57%) +683k (+ 0.36%) 190,536k 193,854k
Parse Time 0.81s (± 0.62%) 0.81s (± 0.74%) +0.00s (+ 0.12%) 0.80s 0.82s
Bind Time 0.56s (± 0.85%) 0.56s (± 0.53%) +0.01s (+ 0.90%) 0.56s 0.57s
Check Time 7.58s (± 0.47%) 7.61s (± 0.60%) +0.03s (+ 0.38%) 7.52s 7.69s
Emit Time 2.48s (± 0.56%) 2.48s (± 0.71%) -0.01s (- 0.24%) 2.44s 2.51s
Total Time 11.43s (± 0.37%) 11.46s (± 0.51%) +0.03s (+ 0.27%) 11.36s 11.57s
Monaco - node (v14.15.1, x64)
Memory used 324,984k (± 0.00%) 324,995k (± 0.01%) +11k (+ 0.00%) 324,957k 325,037k
Parse Time 1.50s (± 0.39%) 1.51s (± 0.59%) +0.01s (+ 0.60%) 1.49s 1.53s
Bind Time 0.77s (± 0.52%) 0.77s (± 0.58%) +0.00s (+ 0.39%) 0.76s 0.78s
Check Time 5.47s (± 0.60%) 5.47s (± 0.40%) +0.01s (+ 0.13%) 5.44s 5.53s
Emit Time 3.29s (± 0.64%) 3.29s (± 0.92%) +0.01s (+ 0.24%) 3.24s 3.37s
Total Time 11.02s (± 0.39%) 11.05s (± 0.45%) +0.03s (+ 0.27%) 10.96s 11.15s
TFS - node (v14.15.1, x64)
Memory used 288,470k (± 0.01%) 288,485k (± 0.01%) +15k (+ 0.01%) 288,454k 288,519k
Parse Time 1.23s (± 0.59%) 1.24s (± 0.72%) +0.00s (+ 0.24%) 1.22s 1.25s
Bind Time 0.74s (± 0.83%) 0.74s (± 0.46%) -0.00s (- 0.27%) 0.73s 0.74s
Check Time 5.08s (± 0.41%) 5.11s (± 0.60%) +0.03s (+ 0.59%) 5.04s 5.18s
Emit Time 3.53s (± 0.96%) 3.53s (± 1.15%) +0.00s (+ 0.11%) 3.39s 3.59s
Total Time 10.58s (± 0.26%) 10.62s (± 0.46%) +0.04s (+ 0.36%) 10.52s 10.73s
material-ui - node (v14.15.1, x64)
Memory used 448,912k (± 0.00%) 448,810k (± 0.05%) -102k (- 0.02%) 447,851k 448,963k
Parse Time 1.83s (± 0.30%) 1.84s (± 0.51%) +0.01s (+ 0.49%) 1.81s 1.86s
Bind Time 0.68s (± 0.70%) 0.68s (± 0.70%) 0.00s ( 0.00%) 0.67s 0.69s
Check Time 12.92s (± 0.53%) 13.06s (± 0.59%) +0.14s (+ 1.05%) 12.89s 13.31s
Emit Time 0.00s (± 0.00%) 0.00s (± 0.00%) 0.00s ( NaN%) 0.00s 0.00s
Total Time 15.43s (± 0.44%) 15.58s (± 0.50%) +0.15s (+ 0.95%) 15.40s 15.82s
xstate - node (v14.15.1, x64)
Memory used 534,408k (± 0.01%) 534,368k (± 0.00%) -40k (- 0.01%) 534,306k 534,425k
Parse Time 2.55s (± 0.42%) 2.56s (± 0.54%) +0.01s (+ 0.39%) 2.53s 2.60s
Bind Time 1.16s (± 0.57%) 1.16s (± 0.75%) +0.00s (+ 0.17%) 1.15s 1.19s
Check Time 1.51s (± 0.31%) 1.51s (± 0.56%) +0.00s (+ 0.07%) 1.50s 1.53s
Emit Time 0.07s (± 0.00%) 0.07s (± 0.00%) 0.00s ( 0.00%) 0.07s 0.07s
Total Time 5.30s (± 0.27%) 5.31s (± 0.34%) +0.01s (+ 0.11%) 5.27s 5.34s
System
Machine Namets-ci-ubuntu
Platformlinux 4.4.0-210-generic
Architecturex64
Available Memory16 GB
Available Memory6 GB
CPUs4 × Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
Hosts
  • node (v14.15.1, x64)
Scenarios
  • Angular - node (v14.15.1, x64)
  • Compiler-Unions - node (v14.15.1, x64)
  • Monaco - node (v14.15.1, x64)
  • TFS - node (v14.15.1, x64)
  • material-ui - node (v14.15.1, x64)
  • xstate - node (v14.15.1, x64)
Benchmark Name Iterations
Current 47898 10
Baseline main 10

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DanielRosenwasser
DanielRosenwasser reviewed Feb 16, 2022
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src/compiler/checker.ts
@@ -27093,6 +27096,12 @@ namespace ts {
const elementTypes: Type[] = [];
const elementFlags: ElementFlags[] = [];
const contextualType = getApparentTypeOfContextualType(node);
if (elementCount === 0 && contextualType && !checkMode) {
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I think this may need to be moved lower, right below the tuple check - otherwise you'll never be able to get an empty tuple inferred via a contextual type.

@RyanCavanaugh RyanCavanaugh mentioned this pull request Feb 16, 2022
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@sandersn sandersn added the Experiment A fork with an experimental idea which might not make it into master label Feb 24, 2022
@RyanCavanaugh RyanCavanaugh mentioned this pull request Dec 12, 2022
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@Andarist Andarist mentioned this pull request Apr 24, 2023
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