abstract properties are now properly elided from imports #62673

puppy0cam · 2025-10-25T10:48:36Z

Copilot

Pull Request Overview

This PR fixes an issue where imports used only in computed property names of abstract class members were not being properly elided during compilation. Abstract members don't generate runtime code, so their imports should be removed when they're only used in type-only contexts.

Key Changes:

Added logic to detect when an identifier is used within a computed property name of an abstract member
Modified the alias reference marking to skip identifiers in abstract member computed properties, allowing their imports to be elided

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
`src/compiler/checker.ts`	Added `isIdentifierInAbstractMemberComputedPropertyName` helper function and integrated it into `markIdentifierAliasReferenced` to prevent marking imports as referenced when used only in abstract member computed properties
`tests/cases/compiler/abstractMethodComputedPropertyElision.ts`	Added compiler test demonstrating the fix with both type-only and normal imports using symbols in abstract computed properties
`tests/baselines/reference/abstractMethodComputedPropertyElision.types`	Baseline file for type checking output of the test case
`tests/baselines/reference/abstractMethodComputedPropertyElision.symbols`	Baseline file for symbol resolution output of the test case
`tests/baselines/reference/abstractMethodComputedPropertyElision.js`	Baseline file showing the compiled JavaScript output where imports are correctly elided

Comments suppressed due to low confidence (1)

src/compiler/checker.ts:1

[nitpick] The condition spans multiple lines with inconsistent parentheses grouping. The logical grouping (isMethodDeclaration || isMethodSignature || isPropertyDeclaration || isPropertySignature) should be fully enclosed in parentheses before the && operator for clarity.

import {

RyanCavanaugh · 2025-10-28T16:36:13Z

@typescript-bot pack this

typescript-bot · 2025-10-28T16:36:19Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`pack this`	✅ Started	✅ Results

typescript-bot · 2025-10-28T16:40:58Z

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/166394/artifacts?artifactName=tgz&fileId=861667B114E58349175ECC655360A8F182ED1A65E0D995FD2ABC530A79AE318002&fileName=/typescript-6.0.0-insiders.20251028.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@6.0.0-pr-62673-3".;

RyanCavanaugh · 2025-10-28T18:52:12Z

@typescript-bot perf test this

typescript-bot · 2025-10-28T18:52:17Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test this`	✅ Started	👀 Results

typescript-bot · 2025-10-28T19:43:41Z

@RyanCavanaugh
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}	_{194,897k (± 0.99%)}	_{195,513k (± 0.80%)}	_~	_192,348k	_196,332k	_{p=0.689 n=6}
_{Parse Time}	_{1.58s (± 2.06%)}	_{1.59s (± 1.45%)}	_~	_1.56s	_1.63s	_{p=0.805 n=6}
_{Bind Time}	_{0.88s (± 1.95%)}	_{0.88s (± 1.37%)}	_~	_0.87s	_0.90s	_{p=0.806 n=6}
_{Check Time}	_{11.74s (± 0.38%)}	_{11.76s (± 0.45%)}	_~	_11.70s	_11.83s	_{p=0.420 n=6}
_{Emit Time}	_{3.45s (± 4.77%)}	_{3.48s (± 4.28%)}	_~	_3.26s	_3.65s	_{p=0.574 n=6}
_{Total Time}	_{17.65s (± 0.71%)}	_{17.72s (± 0.67%)}	_~	_17.56s	_17.87s	_{p=0.378 n=6}
_{angular-1 - node (v18.15.0, x64)}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_955,117	_955,117	_~	_~	_~	_{p=1.000 n=6}
_Types	_415,619	_415,619	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{1,254,733k (± 0.01%)}	_{1,254,752k (± 0.01%)}	_~	_1,254,622k	_1,254,866k	_{p=0.689 n=6}
_{Parse Time}	_{7.98s (± 0.91%)}	_{8.00s (± 0.98%)}	_~	_7.90s	_8.10s	_{p=0.748 n=6}
_{Bind Time}	_{2.28s (± 0.48%)}	_{2.29s (± 0.71%)}	_~	_2.26s	_2.31s	_{p=0.324 n=6}
_{Check Time}	_{38.57s (± 0.30%)}	_{38.70s (± 0.36%)}	_~	_38.44s	_38.81s	_{p=0.109 n=6}
_{Emit Time}	_{17.84s (± 0.33%)}	_{17.93s (± 0.45%)}	_~	_17.85s	_18.05s	_{p=0.092 n=6}
_{Total Time}	_{66.67s (± 0.22%)}	_{66.92s (± 0.18%)}	_{+0.25s (+ 0.37%)}	_66.71s	_67.04s	_{p=0.020 n=6}
_{mui-docs - node (v18.15.0, x64)}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_554,936	_554,936	_~	_~	_~	_{p=1.000 n=6}
_Types	₈₉	₈₉	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{832,086k (± 0.00%)}	_{832,082k (± 0.00%)}	_~	_832,046k	_832,101k	_{p=1.000 n=6}
_{Parse Time}	_{10.53s (± 0.49%)}	_{10.52s (± 0.48%)}	_~	_10.44s	_10.60s	_{p=0.360 n=6}
_{Bind Time}	_{2.68s (± 0.91%)}	_{2.67s (± 0.87%)}	_~	_2.63s	_2.70s	_{p=0.418 n=6}
_{Check Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Emit Time}	_{0.34s (± 3.13%)}	_{0.34s (± 1.53%)}	_~	_0.33s	_0.34s	_{p=0.794 n=6}
_{Total Time}	_{13.55s (± 0.49%)}	_{13.52s (± 0.41%)}	_~	_13.44s	_13.60s	_{p=0.470 n=6}
_{self-build-src - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,237,224	_1,237,228	_{+4 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_259,862	_259,864	_{+2 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{2,974,215k (±10.00%)}	_{3,095,194k (± 0.03%)}	_~	_3,094,048k	_3,096,638k	_{p=0.810 n=6}
_{Parse Time}	_{6.61s (± 1.39%)}	_{6.65s (± 0.58%)}	_~	_6.60s	_6.70s	_{p=0.336 n=6}
_{Bind Time}	_{2.15s (± 1.58%)}	_{2.13s (± 1.05%)}	_~	_2.10s	_2.16s	_{p=0.377 n=6}
_{Check Time}	_{42.29s (± 0.54%)}	_{42.54s (± 0.26%)}	_{+0.25s (+ 0.59%)}	_42.39s	_42.67s	_{p=0.020 n=6}
_{Emit Time}	_{3.49s (± 2.69%)}	_{3.49s (± 1.57%)}	_~	_3.40s	_3.54s	_{p=0.748 n=6}
_{Total Time}	_{54.53s (± 0.43%)}	_{54.81s (± 0.32%)}	_{+0.27s (+ 0.50%)}	_54.51s	_54.98s	_{p=0.045 n=6}
_{self-build-src-public-api - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,237,224	_1,237,228	_{+4 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_259,862	_259,864	_{+2 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{3,158,935k (± 0.02%)}	_{3,038,463k (± 9.72%)}	_~	_2,434,764k	_3,160,049k	_{p=0.575 n=6}
_{Parse Time}	_{6.85s (± 1.13%)}	_{6.80s (± 1.64%)}	_~	_6.60s	_6.93s	_{p=0.689 n=6}
_{Bind Time}	_{2.15s (± 2.30%)}	_{2.17s (± 1.36%)}	_~	_2.12s	_2.20s	_{p=0.630 n=6}
_{Check Time}	_{42.66s (± 0.26%)}	_{42.68s (± 0.66%)}	_~	_42.16s	_42.98s	_{p=0.575 n=6}
_{Emit Time}	_{3.53s (± 2.61%)}	_{3.57s (± 1.84%)}	_~	_3.44s	_3.62s	_{p=0.575 n=6}
_{Total Time}	_{55.19s (± 0.35%)}	_{55.23s (± 0.64%)}	_~	_54.52s	_55.46s	_{p=0.378 n=6}
_{self-compiler - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_262,502	_262,506	_{+4 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_104,038	_104,040	_{+2 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{440,640k (± 0.02%)}	_{440,670k (± 0.01%)}	_~	_440,642k	_440,715k	_{p=0.298 n=6}
_{Parse Time}	_{3.50s (± 1.04%)}	_{3.50s (± 0.61%)}	_~	_3.47s	_3.53s	_{p=0.466 n=6}
_{Bind Time}	_{1.32s (± 0.62%)}	_{1.32s (± 1.31%)}	_~	_1.29s	_1.34s	_{p=0.677 n=6}
_{Check Time}	_{18.95s (± 0.26%)}	_{18.96s (± 0.55%)}	_~	_18.86s	_19.11s	_{p=0.687 n=6}
_{Emit Time}	_{1.52s (± 0.90%)}	_{1.52s (± 1.10%)}	_~	_1.50s	_1.54s	_{p=0.511 n=6}
_{Total Time}	_{25.30s (± 0.17%)}	_{25.29s (± 0.34%)}	_~	_25.20s	_25.42s	_{p=0.748 n=6}
_{ts-pre-modules - node (v18.15.0, x64)}
_Errors	₇₂	₇₂	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_225,374	_225,374	_~	_~	_~	_{p=1.000 n=6}
_Types	_94,297	_94,297	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{369,993k (± 0.01%)}	_{370,125k (± 0.03%)}	_{+133k (+ 0.04%)}	_369,935k	_370,250k	_{p=0.045 n=6}
_{Parse Time}	_{2.80s (± 0.95%)}	_{2.82s (± 0.86%)}	_~	_2.79s	_2.85s	_{p=0.291 n=6}
_{Bind Time}	_{1.61s (± 1.56%)}	_{1.61s (± 1.45%)}	_~	_1.60s	_1.66s	_{p=0.454 n=6}
_{Check Time}	_{16.48s (± 0.40%)}	_{16.52s (± 0.53%)}	_~	_16.42s	_16.66s	_{p=0.688 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{20.90s (± 0.28%)}	_{20.96s (± 0.49%)}	_~	_20.81s	_21.11s	_{p=0.295 n=6}
_{vscode - node (v18.15.0, x64)}
_Errors	₅	₅	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_3,984,901	_3,984,901	_~	_~	_~	_{p=1.000 n=6}
_Types	_1,249,994	_1,249,994	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,768,860k (± 0.00%)}	_{3,768,782k (± 0.00%)}	_~	_3,768,557k	_3,769,056k	_{p=0.471 n=6}
_{Parse Time}	_{15.35s (± 0.45%)}	_{15.32s (± 0.37%)}	_~	_15.24s	_15.41s	_{p=0.521 n=6}
_{Bind Time}	_{4.98s (± 0.41%)}	_{5.01s (± 0.66%)}	_~	_4.97s	_5.07s	_{p=0.107 n=6}
_{Check Time}	_{103.30s (± 2.10%)}	_{101.87s (± 0.22%)}	_~	_101.59s	_102.19s	_{p=0.378 n=6}
_{Emit Time}	_{39.64s (± 9.49%)}	_{38.37s (± 0.80%)}	_~	_38.09s	_38.94s	_{p=1.000 n=6}
_{Total Time}	_{163.27s (± 2.60%)}	_{160.56s (± 0.23%)}	_~	_160.05s	_161.03s	_{p=0.378 n=6}
_{webpack - node (v18.15.0, x64)}
_Errors	₄₀	₄₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_373,618	_373,618	_~	_~	_~	_{p=1.000 n=6}
_Types	_163,475	_163,475	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{530,175k (± 0.02%)}	_{530,146k (± 0.03%)}	_~	_529,980k	_530,416k	_{p=0.575 n=6}
_{Parse Time}	_{4.54s (± 0.55%)}	_{4.55s (± 0.95%)}	_~	_4.50s	_4.61s	_{p=0.685 n=6}
_{Bind Time}	_{1.97s (± 1.16%)}	_{1.93s (± 1.73%)}	_{-0.04s (- 2.03%)}	_1.89s	_1.99s	_{p=0.034 n=6}
_{Check Time}	_{22.15s (± 0.41%)}	_{22.15s (± 0.24%)}	_~	_22.07s	_22.20s	_{p=0.748 n=6}
_{Emit Time}	_0.00s	_{0.00s (±154.76%)}	_~	_0.00s	_0.01s	_{p=0.174 n=6}
_{Total Time}	_{28.66s (± 0.36%)}	_{28.64s (± 0.31%)}	_~	_28.53s	_28.74s	_{p=0.688 n=6}
_{xstate-main - node (v18.15.0, x64)}
_Errors	₃₀	₃₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_676,692	_676,692	_~	_~	_~	_{p=1.000 n=6}
_Types	_203,798	_203,798	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{578,339k (± 0.01%)}	_{578,385k (± 0.02%)}	_~	_578,339k	_578,566k	_{p=0.471 n=6}
_{Parse Time}	_{3.35s (± 0.52%)}	_{3.36s (± 0.31%)}	_~	_3.35s	_3.38s	_{p=0.101 n=6}
_{Bind Time}	_{1.14s (± 0.36%)}	_{1.14s (± 0.55%)}	_~	_1.13s	_1.15s	_{p=0.673 n=6}
_{Check Time}	_{17.63s (± 0.89%)}	_{17.68s (± 2.12%)}	_~	_16.92s	_17.92s	_{p=0.173 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{22.11s (± 0.73%)}	_{22.18s (± 1.70%)}	_~	_21.42s	_22.43s	_{p=0.125 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

tsserver

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-UnionsTSServer - node (v18.15.0, x64)}
_{Req 1 - updateOpen}	_{2,285ms (± 0.88%)}	_{2,287ms (± 0.68%)}	_~	_2,269ms	_2,307ms	_{p=0.873 n=6}
_{Req 2 - geterr}	_{5,356ms (± 0.52%)}	_{5,365ms (± 0.45%)}	_~	_5,330ms	_5,402ms	_{p=0.630 n=6}
_{Req 3 - references}	_{267ms (± 1.92%)}	_{266ms (± 1.62%)}	_~	_260ms	_270ms	_{p=1.000 n=6}
_{Req 4 - navto}	_{218ms (± 0.75%)}	_{221ms (± 2.83%)}	_~	_216ms	_233ms	_{p=0.459 n=6}
_{Req 5 - completionInfo count}	_1,357	_1,357	_~	_~	_~	_{p=1.000 n=6}
_{Req 5 - completionInfo}	_{76ms (± 3.15%)}	_{76ms (± 2.69%)}	_~	_75ms	_80ms	_{p=0.599 n=6}
_{CompilerTSServer - node (v18.15.0, x64)}
_{Req 1 - updateOpen}	_{2,406ms (± 0.56%)}	_{2,409ms (± 0.59%)}	_~	_2,393ms	_2,432ms	_{p=0.630 n=6}
_{Req 2 - geterr}	_{3,997ms (± 0.49%)}	_{4,007ms (± 0.37%)}	_~	_3,994ms	_4,033ms	_{p=0.128 n=6}
_{Req 3 - references}	_{279ms (± 1.33%)}	_{278ms (± 1.22%)}	_~	_275ms	_282ms	_{p=0.287 n=6}
_{Req 4 - navto}	_{223ms (± 0.25%)}	_{223ms (± 0.38%)}	_~	_222ms	_224ms	_{p=0.855 n=6}
_{Req 5 - completionInfo count}	_1,519	_1,519	_~	_~	_~	_{p=1.000 n=6}
_{Req 5 - completionInfo}	_{82ms (± 7.61%)}	_{81ms (± 6.72%)}	_~	_76ms	_87ms	_{p=0.727 n=6}
_{xstate-main-1-tsserver - node (v18.15.0, x64)}
_{Req 1 - updateOpen}	_{6,434ms (± 0.70%)}	_{6,431ms (± 0.51%)}	_~	_6,389ms	_6,470ms	_{p=1.000 n=6}
_{Req 2 - geterr}	_{1,582ms (±10.76%)}	_{1,580ms (±10.56%)}	_~	_1,357ms	_1,709ms	_{p=1.000 n=6}
_{Req 3 - references}	_{125ms (± 6.91%)}	_{126ms (± 8.47%)}	_~	_104ms	_131ms	_{p=0.686 n=6}
_{Req 4 - navto}	_{589ms (± 8.28%)}	_{586ms (± 5.65%)}	_~	_522ms	_611ms	_{p=0.689 n=6}
_{Req 5 - completionInfo count}	_3,487	_3,487	_~	_~	_~	_{p=1.000 n=6}
_{Req 5 - completionInfo}	_{1,254ms (± 2.00%)}	_{1,209ms (± 7.53%)}	_~	_1,024ms	_1,265ms	_{p=0.521 n=6}

System info unknown

Hosts

node (v18.15.0, x64)

Scenarios

CompilerTSServer - node (v18.15.0, x64)
Compiler-UnionsTSServer - node (v18.15.0, x64)
xstate-main-1-tsserver - node (v18.15.0, x64)

_Benchmark	_Name	_Iterations
_Current	_pr	₆
_Baseline	_baseline	₆

startup

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{tsc-startup - node (v18.15.0, x64)}
_{Execution time}	_{158.26ms (± 0.23%)}	_{159.10ms (± 0.14%)}	_{+0.83ms (+ 0.53%)}	_158.00ms	_163.78ms	_{p=0.000 n=600}
_{tsserver-startup - node (v18.15.0, x64)}
_{Execution time}	_{232.77ms (± 0.16%)}	_{232.65ms (± 0.15%)}	_{-0.12ms (- 0.05%)}	_231.14ms	_236.72ms	_{p=0.002 n=600}
_{tsserverlibrary-startup - node (v18.15.0, x64)}
_{Execution time}	_{229.49ms (± 0.16%)}	_{229.18ms (± 0.15%)}	_{-0.31ms (- 0.14%)}	_227.71ms	_233.60ms	_{p=0.000 n=600}
_{typescript-startup - node (v18.15.0, x64)}
_{Execution time}	_{228.52ms (± 0.18%)}	_{228.39ms (± 0.17%)}	_{-0.13ms (- 0.06%)}	_226.92ms	_235.60ms	_{p=0.002 n=600}

System info unknown

Hosts

node (v18.15.0, x64)

Scenarios

tsc-startup - node (v18.15.0, x64)
tsserver-startup - node (v18.15.0, x64)
tsserverlibrary-startup - node (v18.15.0, x64)
typescript-startup - node (v18.15.0, x64)

_Benchmark	_Name	_Iterations
_Current	_pr	₆
_Baseline	_baseline	₆

Developer Information:

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fix: abstract properties are now properly elided from imports

54e5ec9

microsoft#33525

Copilot AI review requested due to automatic review settings October 25, 2025 10:48

github-project-automation bot added this to PR Backlog Oct 25, 2025

github-project-automation bot moved this to Not started in PR Backlog Oct 25, 2025

typescript-bot added the For Backlog Bug PRs that fix a backlog bug label Oct 25, 2025

Copilot AI reviewed Oct 25, 2025

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abstract properties are now properly elided from imports #62673

abstract properties are now properly elided from imports #62673

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RyanCavanaugh commented Oct 28, 2025

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typescript-bot commented Oct 28, 2025

tsc

tsserver

startup

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