Narrow types by typeof operands with extra parenthesis by Andarist · Pull Request #60928 · microsoft/TypeScript

Andarist · 2025-01-07T10:39:14Z

Andarist · 2025-01-07T10:40:09Z

src/compiler/binder.ts

-                return isNarrowableOperand(expr.left) || isNarrowableOperand(expr.right) ||
-                    isNarrowingTypeofOperands(expr.right, expr.left) || isNarrowingTypeofOperands(expr.left, expr.right) ||
-                    (isBooleanLiteral(expr.right) && isNarrowingExpression(expr.left) || isBooleanLiteral(expr.left) && isNarrowingExpression(expr.right));
+                const left = skipParentheses(expr.left);


I rechecked all of the branches in the containing function. They should all now look through parenthesis - this was the only branch missing this

gabritto · 2025-01-07T18:22:03Z

@typescript-bot test it

typescript-bot · 2025-01-07T18:22:11Z

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 · 2025-01-07T18:43:47Z

@gabritto Here are the results of running the user tests with tsc comparing main and refs/pull/60928/merge:

Everything looks good!

typescript-bot · 2025-01-07T18:44:33Z

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

Everything looks the same!

You can check the log here.

typescript-bot · 2025-01-07T19:04:27Z

@gabritto
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	₃₄	₃₄	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_62,363	_62,363	_~	_~	_~	_{p=1.000 n=6}
_Types	_50,395	_50,395	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{194,830k (± 1.03%)}	_{193,025k (± 0.01%)}	_~	_193,015k	_193,041k	_{p=1.000 n=6}
_{Parse Time}	_{1.31s (± 0.93%)}	_{1.31s (± 0.93%)}	_~	_1.29s	_1.32s	_{p=1.000 n=6}
_{Bind Time}	_{0.72s (± 0.57%)}	_0.73s	_{+0.01s (+ 1.62%)}	_~	_~	_{p=0.002 n=6}
_{Check Time}	_{9.79s (± 0.19%)}	_{9.79s (± 0.19%)}	_~	_9.77s	_9.82s	_{p=0.684 n=6}
_{Emit Time}	_{2.74s (± 0.43%)}	_{2.72s (± 0.23%)}	_{-0.02s (- 0.67%)}	_2.71s	_2.73s	_{p=0.019 n=6}
_{Total Time}	_{14.56s (± 0.13%)}	_{14.54s (± 0.18%)}	_~	_14.51s	_14.59s	_{p=0.414 n=6}
_{angular-1 - node (v18.15.0, x64)}
_Errors	₃₇	₃₇	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_947,936	_947,936	_~	_~	_~	_{p=1.000 n=6}
_Types	_410,955	_410,955	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{1,225,814k (± 0.00%)}	_{1,225,830k (± 0.00%)}	_~	_1,225,802k	_1,225,919k	_{p=0.936 n=6}
_{Parse Time}	_{6.63s (± 0.59%)}	_{6.65s (± 0.71%)}	_~	_6.58s	_6.69s	_{p=0.627 n=6}
_{Bind Time}	_{1.89s (± 0.44%)}	_{1.89s (± 0.29%)}	_{+0.01s (+ 0.53%)}	_1.89s	_1.90s	_{p=0.038 n=6}
_{Check Time}	_{31.99s (± 0.15%)}	_{32.00s (± 0.31%)}	_~	_31.85s	_32.12s	_{p=0.748 n=6}
_{Emit Time}	_{15.19s (± 0.57%)}	_{15.18s (± 0.30%)}	_~	_15.09s	_15.22s	_{p=0.199 n=6}
_{Total Time}	_{55.70s (± 0.26%)}	_{55.72s (± 0.17%)}	_~	_55.62s	_55.87s	_{p=0.872 n=6}
_{mui-docs - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_2,446,493	_2,446,493	_~	_~	_~	_{p=1.000 n=6}
_Types	_897,066	_897,066	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{2,311,166k (± 0.00%)}	_{2,311,143k (± 0.00%)}	_~	_2,311,102k	_2,311,190k	_{p=0.521 n=6}
_{Parse Time}	_{8.96s (± 0.46%)}	_{8.95s (± 0.23%)}	_~	_8.91s	_8.97s	_{p=0.685 n=6}
_{Bind Time}	_{2.13s (± 0.89%)}	_{2.12s (± 0.64%)}	_~	_2.10s	_2.14s	_{p=0.510 n=6}
_{Check Time}	_{73.11s (± 0.36%)}	_{72.95s (± 0.34%)}	_~	_72.65s	_73.27s	_{p=0.575 n=6}
_{Emit Time}	_{0.28s (± 1.82%)}	_{0.28s (± 2.70%)}	_~	_0.27s	_0.29s	_{p=0.241 n=6}
_{Total Time}	_{84.49s (± 0.32%)}	_{84.31s (± 0.28%)}	_~	_84.00s	_84.55s	_{p=0.470 n=6}
_{self-build-src - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,226,880	_1,226,882	_{+2 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_266,745	_266,745	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{2,417,994k (± 6.14%)}	_{2,418,472k (± 6.13%)}	_{+478k (+ 0.02%)}	_2,357,600k	_2,721,208k	_{p=0.045 n=6}
_{Parse Time}	_{5.24s (± 0.98%)}	_{5.21s (± 1.47%)}	_~	_5.10s	_5.32s	_{p=0.689 n=6}
_{Bind Time}	_{1.77s (± 0.66%)}	_{1.79s (± 0.91%)}	_~	_1.77s	_1.81s	_{p=0.085 n=6}
_{Check Time}	_{35.17s (± 0.50%)}	_{35.14s (± 0.88%)}	_~	_34.56s	_35.43s	_{p=0.873 n=6}
_{Emit Time}	_{2.99s (± 2.64%)}	_{2.97s (± 1.37%)}	_~	_2.90s	_3.02s	_{p=1.000 n=6}
_{Total Time}	_{45.17s (± 0.47%)}	_{45.12s (± 0.71%)}	_~	_44.54s	_45.42s	_{p=0.936 n=6}
_{self-build-src-public-api - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,226,880	_1,226,882	_{+2 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_266,745	_266,745	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{2,790,457k (±14.24%)}	_{3,032,969k (± 9.74%)}	_~	_2,429,131k	_3,154,236k	_{p=0.173 n=6}
_{Parse Time}	_{8.55s (± 1.96%)}	_{8.59s (± 0.97%)}	_~	_8.46s	_8.68s	_{p=0.810 n=6}
_{Bind Time}	_{2.69s (± 2.12%)}	_{2.67s (± 1.46%)}	_~	_2.60s	_2.71s	_{p=0.227 n=6}
_{Check Time}	_{53.07s (± 0.21%)}	_{53.04s (± 0.38%)}	_~	_52.69s	_53.25s	_{p=0.810 n=6}
_{Emit Time}	_{4.41s (± 2.09%)}	_{4.36s (± 1.36%)}	_~	_4.28s	_4.45s	_{p=0.378 n=6}
_{Total Time}	_{68.73s (± 0.41%)}	_{68.67s (± 0.40%)}	_~	_68.17s	_68.94s	_{p=0.810 n=6}
_{self-compiler - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_262,439	_262,441	_{+2 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_106,628	_106,628	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{440,216k (± 0.02%)}	_{440,199k (± 0.02%)}	_~	_440,096k	_440,279k	_{p=0.936 n=6}
_{Parse Time}	_{3.53s (± 0.93%)}	_{3.53s (± 1.20%)}	_~	_3.47s	_3.57s	_{p=0.687 n=6}
_{Bind Time}	_{1.32s (± 0.93%)}	_{1.30s (± 0.64%)}	_~	_1.29s	_1.31s	_{p=0.209 n=6}
_{Check Time}	_{19.01s (± 0.30%)}	_{18.92s (± 0.45%)}	_{-0.09s (- 0.50%)}	_18.77s	_19.00s	_{p=0.045 n=6}
_{Emit Time}	_{1.54s (± 1.39%)}	_{1.54s (± 0.89%)}	_~	_1.52s	_1.56s	_{p=1.000 n=6}
_{Total Time}	_{25.39s (± 0.25%)}	_{25.30s (± 0.38%)}	_~	_25.14s	_25.42s	_{p=0.092 n=6}
_{ts-pre-modules - node (v18.15.0, x64)}
_Errors	₇₀	₇₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_226,062	_226,062	_~	_~	_~	_{p=1.000 n=6}
_Types	_94,488	_94,488	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{371,640k (± 0.04%)}	_{371,751k (± 0.06%)}	_~	_371,588k	_372,171k	_{p=0.128 n=6}
_{Parse Time}	_{3.62s (± 1.28%)}	_{3.61s (± 0.70%)}	_~	_3.57s	_3.64s	_{p=0.225 n=6}
_{Bind Time}	_{1.95s (± 0.72%)}	_{1.96s (± 0.53%)}	_~	_1.95s	_1.98s	_{p=0.086 n=6}
_{Check Time}	_{20.45s (± 0.20%)}	_{20.47s (± 0.10%)}	_~	_20.45s	_20.49s	_{p=0.565 n=6}
_{Emit Time}	_{0.00s (±244.70%)}	_0.00s	_~	_~	_~	_{p=0.405 n=6}
_{Total Time}	_{26.02s (± 0.19%)}	_{26.05s (± 0.10%)}	_~	_26.03s	_26.09s	_{p=0.226 n=6}
_{vscode - node (v18.15.0, x64)}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_3,233,660	_3,233,660	_~	_~	_~	_{p=1.000 n=6}
_Types	_1,113,001	_1,113,001	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,296,711k (± 0.01%)}	_{3,297,113k (± 0.01%)}	_~	_3,296,572k	_3,297,420k	_{p=0.128 n=6}
_{Parse Time}	_{14.08s (± 0.13%)}	_{14.13s (± 0.55%)}	_~	_14.03s	_14.26s	_{p=0.198 n=6}
_{Bind Time}	_{4.54s (± 2.42%)}	_{4.62s (± 3.30%)}	_~	_4.46s	_4.77s	_{p=0.809 n=6}
_{Check Time}	_{87.41s (± 1.38%)}	_{88.24s (± 3.27%)}	_~	_86.07s	_93.67s	_{p=0.689 n=6}
_{Emit Time}	_{28.58s (± 2.36%)}	_{27.76s (± 2.55%)}	_~	_27.12s	_28.71s	_{p=0.054 n=6}
_{Total Time}	_{134.61s (± 0.44%)}	_{134.74s (± 2.04%)}	_~	_131.98s	_139.82s	_{p=0.471 n=6}
_{webpack - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_291,562	_291,562	_~	_~	_~	_{p=1.000 n=6}
_Types	_118,971	_118,971	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{445,271k (± 0.01%)}	_{445,370k (± 0.03%)}	_~	_445,223k	_445,529k	_{p=0.128 n=6}
_{Parse Time}	_{4.09s (± 0.87%)}	_{4.08s (± 1.68%)}	_~	_3.97s	_4.17s	_{p=1.000 n=6}
_{Bind Time}	_{1.78s (± 1.35%)}	_{1.78s (± 0.46%)}	_~	_1.77s	_1.79s	_{p=0.682 n=6}
_{Check Time}	_{18.75s (± 0.35%)}	_{18.80s (± 0.26%)}	_~	_18.75s	_18.87s	_{p=0.332 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{24.61s (± 0.22%)}	_{24.65s (± 0.45%)}	_~	_24.50s	_24.79s	_{p=0.688 n=6}
_{xstate-main - node (v18.15.0, x64)}
_Errors	₅	₅	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_555,017	_555,017	_~	_~	_~	_{p=1.000 n=6}
_Types	_186,115	_186,115	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{494,037k (± 0.01%)}	_{493,959k (± 0.03%)}	_~	_493,649k	_494,101k	_{p=0.471 n=6}
_{Parse Time}	_{3.42s (± 0.71%)}	_{3.41s (± 1.00%)}	_~	_3.37s	_3.45s	_{p=0.567 n=6}
_{Bind Time}	_{1.18s (± 1.31%)}	_{1.17s (± 1.21%)}	_~	_1.15s	_1.19s	_{p=0.324 n=6}
_{Check Time}	_{19.56s (± 0.42%)}	_{19.80s (± 2.89%)}	_~	_19.49s	_20.96s	_{p=0.748 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{24.16s (± 0.34%)}	_{24.38s (± 2.40%)}	_~	_24.03s	_25.56s	_{p=0.936 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 · 2025-01-07T20:04:24Z

@gabritto Here are the results of running the top 400 repos with tsc comparing main and refs/pull/60928/merge:

Everything looks good!

Narrow types by typeof operands with extra parenthesis

199f492

typescript-bot added the For Backlog Bug PRs that fix a backlog bug label Jan 7, 2025

Andarist commented Jan 7, 2025

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gabritto approved these changes Jan 7, 2025

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JoostK mentioned this pull request Jan 7, 2025

typeof does not narrow in templates angular/angular#59215

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gabritto approved these changes Jan 7, 2025

View reviewed changes

gabritto merged commit a5196c7 into microsoft:main Jan 7, 2025
32 checks passed

Andarist deleted the narrow-typeof-extra-parens branch January 7, 2025 20:55

sandersn removed this from PR Backlog Apr 22, 2025

Andarist mentioned this pull request Jun 4, 2025

Port "Narrow types by typeof operands with extra parenthesis" microsoft/typescript-go#1045

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Narrow types by typeof operands with extra parenthesis#60928

Narrow types by typeof operands with extra parenthesis#60928
gabritto merged 1 commit intomicrosoft:mainfrom
Andarist:narrow-typeof-extra-parens

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