feat(31388): Destructuring array, ability to explicitly tell the variable is unused#41378

a-tarasyuk · 2020-11-03T08:52:39Z

DanielRosenwasser · 2020-11-17T19:36:22Z

@typescript-bot pack this
@typescript-bot test this
@typescript-bot user test this
@typescript-bot run dt
@typescript-bot perf test this

typescript-bot · 2020-11-17T19:36:25Z

Heya @DanielRosenwasser, I've started to run the perf test suite on this PR at 406f130. You can monitor the build here.

Update: The results are in!

typescript-bot · 2020-11-17T19:36:25Z

Heya @DanielRosenwasser, I've started to run the tarball bundle task on this PR at 406f130. You can monitor the build here.

typescript-bot · 2020-11-17T19:36:26Z

Heya @DanielRosenwasser, I've started to run the parallelized community code test suite on this PR at 406f130. You can monitor the build here.

typescript-bot · 2020-11-17T19:36:26Z

Heya @DanielRosenwasser, I've started to run the extended test suite on this PR at 406f130. You can monitor the build here.

typescript-bot · 2020-11-17T19:36:26Z

Heya @DanielRosenwasser, I've started to run the parallelized Definitely Typed test suite on this PR at 406f130. You can monitor the build here.

typescript-bot · 2020-11-17T19:53:31Z

Hey @DanielRosenwasser, 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/89437/artifacts?artifactName=tgz&fileId=6C5096523B0AFE7CF6CA4405CE5704A749697EEE3FE271FA4FE8BD5A92FE435002&fileName=/typescript-4.2.0-insiders.20201117.tgz"
    }
}

and then running npm install.

There is also a playground for this build.

typescript-bot · 2020-11-17T20:15:19Z

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

Here they are:

Comparison Report - master..41378

_Metric	_master	₄₁₃₇₈	_Delta	_Best	_Worst
_{Angular - node (v10.16.3, x64)}
_{Memory used}	_{344,516k (± 0.03%)}	_{344,474k (± 0.03%)}	_{-42k (- 0.01%)}	_344,275k	_344,727k
_{Parse Time}	_{1.99s (± 0.69%)}	_{1.98s (± 0.53%)}	_{-0.01s (- 0.30%)}	_1.95s	_2.00s
_{Bind Time}	_{0.84s (± 0.69%)}	_{0.83s (± 0.87%)}	_{-0.00s (- 0.60%)}	_0.82s	_0.85s
_{Check Time}	_{4.97s (± 0.47%)}	_{4.98s (± 0.41%)}	_{+0.01s (+ 0.24%)}	_4.92s	_5.01s
_{Emit Time}	_{5.37s (± 0.79%)}	_{5.37s (± 0.47%)}	_{-0.00s (- 0.06%)}	_5.31s	_5.41s
_{Total Time}	_{13.17s (± 0.54%)}	_{13.16s (± 0.28%)}	_{-0.00s (- 0.02%)}	_13.06s	_13.23s
_{Monaco - node (v10.16.3, x64)}
_{Memory used}	_{354,726k (± 0.02%)}	_{354,750k (± 0.03%)}	_{+24k (+ 0.01%)}	_354,505k	_355,106k
_{Parse Time}	_{1.61s (± 0.44%)}	_{1.60s (± 0.59%)}	_{-0.01s (- 0.31%)}	_1.59s	_1.63s
_{Bind Time}	_{0.73s (± 0.76%)}	_{0.73s (± 0.71%)}	_{+0.00s (+ 0.14%)}	_0.72s	_0.74s
_{Check Time}	_{5.16s (± 0.49%)}	_{5.12s (± 0.50%)}	_{-0.04s (- 0.70%)}	_5.07s	_5.19s
_{Emit Time}	_{2.82s (± 0.51%)}	_{2.81s (± 0.66%)}	_{-0.01s (- 0.28%)}	_2.78s	_2.86s
_{Total Time}	_{10.32s (± 0.40%)}	_{10.27s (± 0.42%)}	_{-0.05s (- 0.48%)}	_10.18s	_10.36s
_{TFS - node (v10.16.3, x64)}
_{Memory used}	_{307,839k (± 0.02%)}	_{307,870k (± 0.02%)}	_{+31k (+ 0.01%)}	_307,719k	_307,967k
_{Parse Time}	_{1.24s (± 0.81%)}	_{1.24s (± 0.50%)}	_{+0.00s (+ 0.32%)}	_1.23s	_1.25s
_{Bind Time}	_{0.69s (± 0.87%)}	_{0.68s (± 0.91%)}	_{-0.01s (- 1.02%)}	_0.67s	_0.69s
_{Check Time}	_{4.59s (± 0.58%)}	_{4.59s (± 0.42%)}	_{-0.00s (- 0.07%)}	_4.54s	_4.63s
_{Emit Time}	_{2.96s (± 0.94%)}	_{2.93s (± 0.88%)}	_{-0.03s (- 0.95%)}	_2.87s	_2.98s
_{Total Time}	_{9.47s (± 0.47%)}	_{9.44s (± 0.34%)}	_{-0.04s (- 0.39%)}	_9.36s	_9.51s
_{material-ui - node (v10.16.3, x64)}
_{Memory used}	_{489,230k (± 0.01%)}	_{489,296k (± 0.02%)}	_{+66k (+ 0.01%)}	_489,157k	_489,515k
_{Parse Time}	_{2.06s (± 0.40%)}	_{2.06s (± 0.44%)}	_{-0.00s (- 0.19%)}	_2.05s	_2.09s
_{Bind Time}	_{0.66s (± 0.57%)}	_{0.65s (± 1.04%)}	_{-0.00s (- 0.15%)}	_0.64s	_0.67s
_{Check Time}	_{13.68s (± 0.62%)}	_{13.59s (± 0.85%)}	_{-0.10s (- 0.71%)}	_13.38s	_13.82s
_{Emit Time}	_{0.00s (± 0.00%)}	_{0.00s (± 0.00%)}	_{0.00s ( NaN%)}	_0.00s	_0.00s
_{Total Time}	_{16.40s (± 0.53%)}	_{16.30s (± 0.73%)}	_{-0.10s (- 0.62%)}	_16.08s	_16.53s
_{Angular - node (v12.1.0, x64)}
_{Memory used}	_{322,336k (± 0.01%)}	_{322,365k (± 0.02%)}	_{+30k (+ 0.01%)}	_322,225k	_322,599k
_{Parse Time}	_{1.96s (± 0.24%)}	_{1.96s (± 0.59%)}	_{+0.00s (+ 0.20%)}	_1.94s	_1.99s
_{Bind Time}	_{0.81s (± 0.45%)}	_{0.82s (± 0.71%)}	_{+0.00s (+ 0.37%)}	_0.80s	_0.83s
_{Check Time}	_{4.91s (± 0.41%)}	_{4.92s (± 1.04%)}	_{+0.01s (+ 0.29%)}	_4.86s	_5.11s
_{Emit Time}	_{5.49s (± 0.53%)}	_{5.50s (± 0.71%)}	_{+0.02s (+ 0.31%)}	_5.43s	_5.59s
_{Total Time}	_{13.16s (± 0.31%)}	_{13.20s (± 0.51%)}	_{+0.04s (+ 0.30%)}	_13.05s	_13.34s
_{Monaco - node (v12.1.0, x64)}
_{Memory used}	_{336,824k (± 0.02%)}	_{336,895k (± 0.02%)}	_{+71k (+ 0.02%)}	_336,767k	_337,064k
_{Parse Time}	_{1.59s (± 0.90%)}	_{1.59s (± 0.86%)}	_{+0.00s (+ 0.13%)}	_1.57s	_1.63s
_{Bind Time}	_{0.71s (± 0.56%)}	_{0.71s (± 0.81%)}	_{+0.00s (+ 0.14%)}	_0.70s	_0.72s
_{Check Time}	_{4.93s (± 0.60%)}	_{4.93s (± 0.57%)}	_{-0.00s (- 0.04%)}	_4.87s	_4.98s
_{Emit Time}	_{2.86s (± 0.50%)}	_{2.89s (± 0.63%)}	_{+0.04s (+ 1.26%)}	_2.86s	_2.95s
_{Total Time}	_{10.09s (± 0.48%)}	_{10.13s (± 0.32%)}	_{+0.04s (+ 0.40%)}	_10.05s	_10.20s
_{TFS - node (v12.1.0, x64)}
_{Memory used}	_{292,077k (± 0.01%)}	_{292,095k (± 0.02%)}	_{+18k (+ 0.01%)}	_291,937k	_292,264k
_{Parse Time}	_{1.25s (± 0.49%)}	_{1.25s (± 0.74%)}	_{-0.00s (- 0.08%)}	_1.23s	_1.27s
_{Bind Time}	_{0.65s (± 1.16%)}	_{0.66s (± 1.06%)}	_{+0.01s (+ 1.07%)}	_0.65s	_0.68s
_{Check Time}	_{4.52s (± 0.66%)}	_{4.51s (± 0.49%)}	_{-0.01s (- 0.15%)}	_4.48s	_4.58s
_{Emit Time}	_{2.96s (± 0.97%)}	_{2.95s (± 0.90%)}	_{-0.01s (- 0.34%)}	_2.90s	_3.01s
_{Total Time}	_{9.38s (± 0.54%)}	_{9.38s (± 0.46%)}	_{-0.01s (- 0.09%)}	_9.27s	_9.48s
_{material-ui - node (v12.1.0, x64)}
_{Memory used}	_{467,084k (± 0.07%)}	_{466,861k (± 0.08%)}	_{-223k (- 0.05%)}	_466,113k	_467,361k
_{Parse Time}	_{2.08s (± 0.48%)}	_{2.08s (± 0.45%)}	_{-0.01s (- 0.29%)}	_2.06s	_2.10s
_{Bind Time}	_{0.65s (± 1.06%)}	_{0.65s (± 1.12%)}	_{+0.00s (+ 0.47%)}	_0.64s	_0.67s
_{Check Time}	_{12.14s (± 0.94%)}	_{12.21s (± 1.13%)}	_{+0.07s (+ 0.54%)}	_11.81s	_12.50s
_{Emit Time}	_{0.00s (± 0.00%)}	_{0.00s (± 0.00%)}	_{0.00s ( NaN%)}	_0.00s	_0.00s
_{Total Time}	_{14.87s (± 0.80%)}	_{14.94s (± 0.93%)}	_{+0.07s (+ 0.46%)}	_14.52s	_15.22s
_{Angular - node (v8.9.0, x64)}
_{Memory used}	_{346,997k (± 0.02%)}	_{347,020k (± 0.02%)}	_{+24k (+ 0.01%)}	_346,762k	_347,176k
_{Parse Time}	_{2.52s (± 0.35%)}	_{2.52s (± 0.44%)}	_{-0.00s (- 0.12%)}	_2.50s	_2.55s
_{Bind Time}	_{0.87s (± 0.92%)}	_{0.87s (± 0.42%)}	_{+0.00s (+ 0.23%)}	_0.87s	_0.88s
_{Check Time}	_{5.65s (± 0.74%)}	_{5.63s (± 0.85%)}	_{-0.02s (- 0.34%)}	_5.54s	_5.74s
_{Emit Time}	_{6.38s (± 0.61%)}	_{6.35s (± 1.13%)}	_{-0.03s (- 0.52%)}	_6.23s	_6.51s
_{Total Time}	_{15.43s (± 0.46%)}	_{15.37s (± 0.71%)}	_{-0.06s (- 0.36%)}	_15.18s	_15.66s
_{Monaco - node (v8.9.0, x64)}
_{Memory used}	_{358,515k (± 0.01%)}	_{358,533k (± 0.02%)}	_{+18k (+ 0.01%)}	_358,392k	_358,730k
_{Parse Time}	_{1.94s (± 0.49%)}	_{1.94s (± 0.57%)}	_{-0.00s (- 0.05%)}	_1.91s	_1.96s
_{Bind Time}	_{0.91s (± 0.73%)}	_{0.92s (± 0.71%)}	_{+0.00s (+ 0.55%)}	_0.90s	_0.93s
_{Check Time}	_{5.67s (± 0.56%)}	_{5.69s (± 0.42%)}	_{+0.02s (+ 0.41%)}	_5.64s	_5.73s
_{Emit Time}	_{3.43s (± 0.79%)}	_{3.41s (± 0.93%)}	_{-0.02s (- 0.61%)}	_3.29s	_3.45s
_{Total Time}	_{11.94s (± 0.39%)}	_{11.94s (± 0.36%)}	_{+0.00s (+ 0.03%)}	_11.86s	_12.03s
_{TFS - node (v8.9.0, x64)}
_{Memory used}	_{310,383k (± 0.01%)}	_{310,404k (± 0.02%)}	_{+22k (+ 0.01%)}	_310,309k	_310,540k
_{Parse Time}	_{1.57s (± 0.63%)}	_{1.57s (± 0.65%)}	_{-0.00s (- 0.06%)}	_1.56s	_1.61s
_{Bind Time}	_{0.69s (± 0.72%)}	_{0.69s (± 0.49%)}	_{+0.01s (+ 1.02%)}	_0.69s	_0.70s
_{Check Time}	_{5.33s (± 0.67%)}	_{5.35s (± 0.63%)}	_{+0.03s (+ 0.49%)}	_5.29s	_5.44s
_{Emit Time}	_{2.96s (± 1.04%)}	_{2.98s (± 0.98%)}	_{+0.02s (+ 0.81%)}	_2.91s	_3.04s
_{Total Time}	_{10.54s (± 0.59%)}	_{10.60s (± 0.50%)}	_{+0.06s (+ 0.53%)}	_10.48s	_10.71s
_{material-ui - node (v8.9.0, x64)}
_{Memory used}	_{496,276k (± 0.01%)}	_{496,308k (± 0.01%)}	_{+32k (+ 0.01%)}	_496,138k	_496,366k
_{Parse Time}	_{2.50s (± 0.46%)}	_{2.49s (± 0.61%)}	_{-0.01s (- 0.24%)}	_2.47s	_2.54s
_{Bind Time}	_{0.81s (± 1.30%)}	_{0.82s (± 1.18%)}	_{+0.01s (+ 0.61%)}	_0.80s	_0.84s
_{Check Time}	_{18.26s (± 0.53%)}	_{18.05s (± 0.86%)}	_{-0.21s (- 1.15%)}	_17.74s	_18.43s
_{Emit Time}	_{0.00s (± 0.00%)}	_{0.00s (± 0.00%)}	_{0.00s ( NaN%)}	_0.00s	_0.00s
_{Total Time}	_{21.58s (± 0.43%)}	_{21.37s (± 0.78%)}	_{-0.20s (- 0.95%)}	_21.08s	_21.80s
_{Angular - node (v8.9.0, x86)}
_{Memory used}	_{199,009k (± 0.02%)}	_{198,981k (± 0.02%)}	_{-28k (- 0.01%)}	_198,849k	_199,046k
_{Parse Time}	_{2.43s (± 0.93%)}	_{2.43s (± 0.80%)}	_{-0.01s (- 0.25%)}	_2.39s	_2.49s
_{Bind Time}	_{1.02s (± 1.04%)}	_{1.02s (± 0.89%)}	_{-0.01s (- 0.59%)}	_1.00s	_1.04s
_{Check Time}	_{5.05s (± 0.66%)}	_{5.07s (± 0.73%)}	_{+0.02s (+ 0.36%)}	_5.00s	_5.17s
_{Emit Time}	_{6.13s (± 0.57%)}	_{6.11s (± 0.73%)}	_{-0.02s (- 0.31%)}	_6.04s	_6.23s
_{Total Time}	_{14.64s (± 0.49%)}	_{14.62s (± 0.45%)}	_{-0.02s (- 0.11%)}	_14.51s	_14.74s
_{Monaco - node (v8.9.0, x86)}
_{Memory used}	_{203,074k (± 0.02%)}	_{203,052k (± 0.02%)}	_{-22k (- 0.01%)}	_202,937k	_203,117k
_{Parse Time}	_{1.99s (± 1.23%)}	_{1.96s (± 0.54%)}	_{-0.02s (- 1.11%)}	_1.94s	_1.98s
_{Bind Time}	_{0.72s (± 1.22%)}	_{0.72s (± 0.62%)}	_{-0.01s (- 0.69%)}	_0.71s	_0.73s
_{Check Time}	_{5.78s (± 0.52%)}	_{5.75s (± 1.14%)}	_{-0.03s (- 0.54%)}	_5.50s	_5.82s
_{Emit Time}	_{2.77s (± 1.28%)}	_{2.80s (± 2.98%)}	_{+0.03s (+ 0.94%)}	_2.71s	_3.13s
_{Total Time}	_{11.26s (± 0.47%)}	_{11.23s (± 0.34%)}	_{-0.03s (- 0.28%)}	_11.15s	_11.32s
_{TFS - node (v8.9.0, x86)}
_{Memory used}	_{177,512k (± 0.02%)}	_{177,495k (± 0.03%)}	_{-17k (- 0.01%)}	_177,395k	_177,639k
_{Parse Time}	_{1.62s (± 1.53%)}	_{1.60s (± 0.59%)}	_{-0.01s (- 0.68%)}	_1.59s	_1.63s
_{Bind Time}	_{0.66s (± 1.37%)}	_{0.66s (± 1.32%)}	_{+0.00s (+ 0.46%)}	_0.65s	_0.69s
_{Check Time}	_{4.85s (± 1.04%)}	_{4.88s (± 0.87%)}	_{+0.04s (+ 0.72%)}	_4.82s	_5.03s
_{Emit Time}	_{2.89s (± 2.68%)}	_{2.85s (± 1.26%)}	_{-0.04s (- 1.39%)}	_2.74s	_2.93s
_{Total Time}	_{10.00s (± 1.30%)}	_{9.99s (± 0.75%)}	_{-0.01s (- 0.14%)}	_9.84s	_10.23s
_{material-ui - node (v8.9.0, x86)}
_{Memory used}	_{279,361k (± 0.01%)}	_{279,368k (± 0.02%)}	_{+6k (+ 0.00%)}	_279,208k	_279,463k
_{Parse Time}	_{2.56s (± 0.60%)}	_{2.55s (± 0.54%)}	_{-0.01s (- 0.20%)}	_2.52s	_2.59s
_{Bind Time}	_{0.76s (± 6.65%)}	_{0.76s (± 5.27%)}	_{+0.00s (+ 0.13%)}	_0.69s	_0.86s
_{Check Time}	_{16.60s (± 1.16%)}	_{16.48s (± 1.21%)}	_{-0.12s (- 0.73%)}	_16.17s	_16.95s
_{Emit Time}	_{0.00s (± 0.00%)}	_{0.00s (± 0.00%)}	_{0.00s ( NaN%)}	_0.00s	_0.00s
_{Total Time}	_{19.91s (± 0.86%)}	_{19.79s (± 0.98%)}	_{-0.13s (- 0.63%)}	_19.49s	_20.26s

System

_{Machine Name}	_ts-ci-ubuntu
_Platform	_{linux 4.4.0-166-generic}
_Architecture	_x64
_{Available Memory}	_{16 GB}
_{Available Memory}	_{1 GB}
_CPUs	_{4 × Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz}

Hosts

node (v10.16.3, x64)
node (v12.1.0, x64)
node (v8.9.0, x64)
node (v8.9.0, x86)

Scenarios

Angular - node (v10.16.3, x64)
Angular - node (v12.1.0, x64)
Angular - node (v8.9.0, x64)
Angular - node (v8.9.0, x86)
Monaco - node (v10.16.3, x64)
Monaco - node (v12.1.0, x64)
Monaco - node (v8.9.0, x64)
Monaco - node (v8.9.0, x86)
TFS - node (v10.16.3, x64)
TFS - node (v12.1.0, x64)
TFS - node (v8.9.0, x64)
TFS - node (v8.9.0, x86)
material-ui - node (v10.16.3, x64)
material-ui - node (v12.1.0, x64)
material-ui - node (v8.9.0, x64)
material-ui - node (v8.9.0, x86)

_Benchmark	_Name	_Iterations
_Current	₄₁₃₇₈	₁₀
_Baseline	_master	₁₀

typescript-bot · 2020-11-17T20:33:42Z

The user suite test run you requested has finished and failed. I've opened a PR with the baseline diff from master.

sandersn

Personally, I agree with the ensuing discussion in the originating bug, and think you should simplify down to (2).

src/compiler/checker.ts

sandersn

Still need to test object binding elements -- we must not have test coverage for them, or they're being handled some other way (in which case I'd like to know what it is).

src/compiler/checker.ts

…osoft#41378)

tests/baselines/reference/unusedVariablesWithUnderscoreInBindingElement.errors.txt

mangkoran · 2021-11-13T17:24:09Z

Sorry for asking here, but is there any documentation of the usage of _ prefix in this context yet? I have not found it in TypeScript's documentation

markeissler · 2022-04-12T21:20:49Z

@mangkoran ...

TypeScript 4.2.0 Release Notes - Destructured Variables Can Be Explicitly Marked as Unused

Hope it helps.

typescript-bot added the For Backlog Bug PRs that fix a backlog bug label Nov 3, 2020

DanielRosenwasser requested review from ahejlsberg and sandersn November 17, 2020 19:33

typescript-bot added For Milestone Bug PRs that fix a bug with a specific milestone and removed For Backlog Bug PRs that fix a backlog bug labels Nov 17, 2020

typescript-bot mentioned this pull request Nov 17, 2020

🤖 User test baselines have changed for feat/31388 typescript-bot/TypeScript#107

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sandersn requested changes Nov 24, 2020

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a-tarasyuk force-pushed the feat/31388 branch from 406f130 to 491ce13 Compare November 24, 2020 18:29

a-tarasyuk requested a review from sandersn December 2, 2020 08:06

sandersn requested changes Dec 11, 2020

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a-tarasyuk force-pushed the feat/31388 branch 3 times, most recently from ec02d5b to 5dc5f07 Compare December 11, 2020 19:00

a-tarasyuk requested a review from sandersn December 11, 2020 19:15

feat(31388): allow binding elements starting with an underscore

859466f

a-tarasyuk force-pushed the feat/31388 branch from 5dc5f07 to 859466f Compare December 19, 2020 12:06

sandersn approved these changes Jan 12, 2021

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sandersn merged commit a276a6d into microsoft:master Jan 12, 2021

Zzzen pushed a commit to Zzzen/TypeScript that referenced this pull request Jan 16, 2021

feat(31388): allow binding elements starting with an underscore (micr…

569e938

…osoft#41378)

DanielRosenwasser reviewed Feb 12, 2021

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tests/baselines/reference/unusedVariablesWithUnderscoreInBindingElement.errors.txt Show resolved Hide resolved

jeanpaulc mentioned this pull request Mar 23, 2021

Update: add option to ignore unused variables in array pattern decls eslint/eslint#13954

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