Keep accessors as accessors in emitted anonymous class declarations #60853

Andarist · 2024-12-25T13:59:55Z

fixes #60672
fixes #44938
fixes #58790
fixes #61967

Andarist · 2025-01-01T20:35:57Z

src/compiler/checker.ts

@@ -14939,6 +14966,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                    }
                    if (!singleProp) {
                        singleProp = prop;
+                        propFlags = (prop.flags & SymbolFlags.Accessor) || SymbolFlags.Property;


Perhaps the accessor case should be handled through checkFlags. I'm worried that it would require looking carefully at all call sites that handle accessors to cover for this new case - but maybe I'm worried about it prematurely. Anyway, let me know what you think about it ;)

Andarist · 2025-01-01T20:39:46Z

src/compiler/checker.ts

+                        // classes created by mixins are represented as intersections and overriding a property in a derived class redefines it completely at runtime
+                        // so a get accessor can't be merged with a set accessor in a base class, for that reason the accessor flags are only used when they are the same in all consistuents


perhaps if I'd use a new CheckFlags.SyntheticAccessor that wouldn't really matter as much? I'm not sure if it's even that important of a rule to begin with, I just erred on the safer side of things and maintained the current behavior for this ambiguous case

…essors-on-emitted-anonymous-class-declarations

jakebailey · 2025-06-30T17:23:04Z

Doubtful this will catch anything, but

@typescript-bot test it

typescript-bot · 2025-06-30T17:23:09Z

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 · 2025-06-30T17:44:51Z

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

Everything looks the same!

You can check the log here.

typescript-bot · 2025-06-30T18:01:25Z

@jakebailey Here are the results of running the user tests with tsc comparing main and refs/pull/60853/merge:

Everything looks good!

typescript-bot · 2025-06-30T18:16:30Z

@jakebailey
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	_62,370	_62,370	_~	_~	_~	_{p=1.000 n=6}
_Types	_50,386	_50,386	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{195,949k (± 0.71%)}	_{196,574k (± 0.03%)}	_~	_196,500k	_196,640k	_{p=0.298 n=6}
_{Parse Time}	_{1.60s (± 0.47%)}	_{1.60s (± 1.56%)}	_~	_1.57s	_1.63s	_{p=0.805 n=6}
_{Bind Time}	_{0.88s (± 1.02%)}	_{0.88s (± 1.18%)}	_~	_0.86s	_0.89s	_{p=0.673 n=6}
_{Check Time}	_{11.78s (± 0.37%)}	_{11.83s (± 0.94%)}	_~	_11.70s	_11.96s	_{p=0.521 n=6}
_{Emit Time}	_{3.33s (± 3.68%)}	_{3.27s (± 0.77%)}	_~	_3.23s	_3.31s	_{p=0.079 n=6}
_{Total Time}	_{17.58s (± 0.73%)}	_{17.58s (± 0.62%)}	_~	_17.47s	_17.71s	_{p=1.000 n=6}
_{angular-1 - node (v18.15.0, x64)}
_Errors	₅₆	₅₆	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_948,753	_948,753	_~	_~	_~	_{p=1.000 n=6}
_Types	_410,846	_410,846	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{1,225,207k (± 0.00%)}	_{1,225,195k (± 0.01%)}	_~	_1,225,077k	_1,225,257k	_{p=0.689 n=6}
_{Parse Time}	_{7.86s (± 1.11%)}	_{7.98s (± 0.48%)}	_~	_7.92s	_8.02s	_{p=0.064 n=6}
_{Bind Time}	_{2.28s (± 0.43%)}	_{2.29s (± 1.13%)}	_~	_2.24s	_2.31s	_{p=0.324 n=6}
_{Check Time}	_{37.95s (± 0.37%)}	_{38.01s (± 0.36%)}	_~	_37.85s	_38.19s	_{p=0.688 n=6}
_{Emit Time}	_{17.82s (± 0.66%)}	_{17.90s (± 0.90%)}	_~	_17.76s	_18.20s	_{p=0.423 n=6}
_{Total Time}	_{65.92s (± 0.43%)}	_{66.17s (± 0.29%)}	_~	_65.91s	_66.43s	_{p=0.128 n=6}
_{mui-docs - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_2,509,183	_2,509,183	_~	_~	_~	_{p=1.000 n=6}
_Types	_892,716	_892,716	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{2,804,482k (± 0.00%)}	_{2,804,373k (± 0.00%)}	_~	_2,804,132k	_2,804,508k	_{p=0.173 n=6}
_{Parse Time}	_{10.53s (± 0.37%)}	_{10.49s (± 0.16%)}	_~	_10.47s	_10.51s	_{p=0.090 n=6}
_{Bind Time}	_{2.74s (± 0.15%)}	_{2.74s (± 0.84%)}	_~	_2.72s	_2.78s	_{p=0.498 n=6}
_{Check Time}	_{101.08s (± 0.35%)}	_{101.48s (± 2.19%)}	_~	_99.83s	_105.95s	_{p=0.230 n=6}
_{Emit Time}	_{0.37s (± 2.04%)}	_{0.37s (± 2.76%)}	_~	_0.36s	_0.39s	_{p=0.437 n=6}
_{Total Time}	_{114.71s (± 0.33%)}	_{115.09s (± 1.94%)}	_~	_113.40s	_119.59s	_{p=0.229 n=6}
_{self-build-src - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,227,080	_1,227,095	_{+15 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_267,443	_267,448	_{+5 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{2,781,556k (±12.57%)}	_{2,756,565k (±13.68%)}	_~	_2,364,729k	_3,097,767k	_{p=1.000 n=6}
_{Parse Time}	_{6.61s (± 1.29%)}	_{6.59s (± 1.40%)}	_~	_6.46s	_6.69s	_{p=0.575 n=6}
_{Bind Time}	_{2.17s (± 0.63%)}	_{2.16s (± 1.49%)}	_~	_2.12s	_2.21s	_{p=0.193 n=6}
_{Check Time}	_{42.62s (± 0.63%)}	_{42.75s (± 0.88%)}	_~	_41.99s	_42.96s	_{p=0.298 n=6}
_{Emit Time}	_{3.40s (± 2.56%)}	_{3.54s (± 2.04%)}	_{🔻+0.14s (+ 4.27%)}	_3.44s	_3.60s	_{p=0.045 n=6}
_{Total Time}	_{54.81s (± 0.70%)}	_{55.05s (± 0.78%)}	_~	_54.18s	_55.30s	_{p=0.471 n=6}
_{self-build-src-public-api - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,227,080	_1,227,095	_{+15 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_267,443	_267,448	_{+5 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{2,674,885k (±14.05%)}	_{2,796,572k (±14.27%)}	_~	_2,431,253k	_3,161,462k	_{p=0.471 n=6}
_{Parse Time}	_{6.82s (± 1.24%)}	_{6.87s (± 0.56%)}	_~	_6.81s	_6.90s	_{p=0.378 n=6}
_{Bind Time}	_{2.21s (± 1.31%)}	_{2.21s (± 1.06%)}	_~	_2.18s	_2.24s	_{p=1.000 n=6}
_{Check Time}	_{42.80s (± 0.53%)}	_{42.78s (± 0.46%)}	_~	_42.58s	_43.02s	_{p=0.810 n=6}
_{Emit Time}	_{3.60s (± 3.35%)}	_{3.53s (± 2.78%)}	_~	_3.41s	_3.70s	_{p=0.297 n=6}
_{Total Time}	_{55.43s (± 0.53%)}	_{55.39s (± 0.50%)}	_~	_55.04s	_55.71s	_{p=0.873 n=6}
_{self-compiler - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_262,529	_262,544	_{+15 (+ 0.01%)}	_~	_~	_{p=0.001 n=6}
_Types	_107,150	_107,155	_{+5 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{441,796k (± 0.01%)}	_{441,855k (± 0.03%)}	_~	_441,640k	_442,078k	_{p=0.093 n=6}
_{Parse Time}	_{3.52s (± 0.47%)}	_{3.54s (± 0.94%)}	_~	_3.50s	_3.59s	_{p=0.226 n=6}
_{Bind Time}	_{1.32s (± 1.07%)}	_{1.32s (± 1.11%)}	_~	_1.30s	_1.34s	_{p=0.870 n=6}
_{Check Time}	_{18.92s (± 0.28%)}	_{18.84s (± 0.32%)}	_~	_18.77s	_18.95s	_{p=0.063 n=6}
_{Emit Time}	_{1.53s (± 1.62%)}	_{1.51s (± 1.16%)}	_~	_1.49s	_1.54s	_{p=0.413 n=6}
_{Total Time}	_{25.28s (± 0.24%)}	_{25.22s (± 0.37%)}	_~	_25.10s	_25.36s	_{p=0.261 n=6}
_{ts-pre-modules - node (v18.15.0, x64)}
_Errors	₇₁	₇₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_225,367	_225,367	_~	_~	_~	_{p=1.000 n=6}
_Types	_94,290	_94,290	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{371,088k (± 0.01%)}	_{371,143k (± 0.02%)}	_~	_371,080k	_371,303k	_{p=0.298 n=6}
_{Parse Time}	_{2.88s (± 0.97%)}	_{2.88s (± 0.87%)}	_~	_2.83s	_2.90s	_{p=1.000 n=6}
_{Bind Time}	_{1.61s (± 1.28%)}	_{1.59s (± 0.77%)}	_~	_1.58s	_1.61s	_{p=0.365 n=6}
_{Check Time}	_{16.36s (± 0.33%)}	_{16.34s (± 0.30%)}	_~	_16.27s	_16.39s	_{p=0.571 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{20.85s (± 0.34%)}	_{20.81s (± 0.37%)}	_~	_20.73s	_20.90s	_{p=0.466 n=6}
_{vscode - node (v18.15.0, x64)}
_Errors	₃₃	₃₃	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_3,498,707	_3,498,707	_~	_~	_~	_{p=1.000 n=6}
_Types	_1,176,728	_1,176,728	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,548,716k (± 0.00%)}	_{3,548,740k (± 0.00%)}	_~	_3,548,497k	_3,548,913k	_{p=0.810 n=6}
_{Parse Time}	_{18.80s (± 3.28%)}	_{18.47s (± 0.26%)}	_~	_18.40s	_18.53s	_{p=0.230 n=6}
_{Bind Time}	_{6.00s (± 0.33%)}	_{5.99s (± 0.57%)}	_~	_5.94s	_6.02s	_{p=0.803 n=6}
_{Check Time}	_{120.15s (± 4.48%)}	_{115.69s (± 3.07%)}	_~	_113.63s	_122.89s	_{p=0.298 n=6}
_{Emit Time}	_{37.17s (± 2.67%)}	_{36.40s (± 1.93%)}	_~	_36.02s	_37.83s	_{p=0.471 n=6}
_{Total Time}	_{182.11s (± 3.51%)}	_{176.54s (± 2.43%)}	_~	_174.11s	_185.23s	_{p=0.378 n=6}
_{webpack - node (v18.15.0, x64)}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_318,019	_318,019	_~	_~	_~	_{p=1.000 n=6}
_Types	_137,705	_137,705	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{472,300k (± 0.02%)}	_{472,088k (± 0.01%)}	_{-212k (- 0.04%)}	_472,009k	_472,187k	_{p=0.008 n=6}
_{Parse Time}	_{4.35s (± 0.52%)}	_{4.36s (± 1.12%)}	_~	_4.30s	_4.45s	_{p=0.685 n=6}
_{Bind Time}	_{1.78s (± 0.69%)}	_{1.77s (± 0.97%)}	_~	_1.75s	_1.80s	_{p=0.137 n=6}
_{Check Time}	_{20.78s (± 0.52%)}	_{20.69s (± 0.41%)}	_~	_20.63s	_20.84s	_{p=0.108 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{26.92s (± 0.46%)}	_{26.82s (± 0.48%)}	_~	_26.70s	_27.05s	_{p=0.128 n=6}
_{xstate-main - node (v18.15.0, x64)}
_Errors	₃₀	₃₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_665,978	_665,978	_~	_~	_~	_{p=1.000 n=6}
_Types	_199,345	_199,345	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{570,374k (± 0.01%)}	_{570,277k (± 0.03%)}	_~	_569,930k	_570,378k	_{p=0.230 n=6}
_{Parse Time}	_{4.25s (± 0.77%)}	_{4.25s (± 0.72%)}	_~	_4.22s	_4.30s	_{p=1.000 n=6}
_{Bind Time}	_{1.34s (± 0.73%)}	_{1.34s (± 0.87%)}	_~	_1.33s	_1.36s	_{p=1.000 n=6}
_{Check Time}	_{19.93s (± 0.38%)}	_{19.94s (± 0.30%)}	_~	_19.89s	_20.04s	_{p=0.936 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{25.52s (± 0.36%)}	_{25.54s (± 0.25%)}	_~	_25.47s	_25.64s	_{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 · 2025-06-30T19:04:58Z

@jakebailey Here are the results of running the top 400 repos with tsc comparing main and refs/pull/60853/merge:

Everything looks good!

src/compiler/checker.ts

Keep accessors as accessors in emitted anonymous class declarations

3fe512a

typescript-bot assigned rbuckton Dec 25, 2024

typescript-bot added For Backlog Bug PRs that fix a backlog bug For Milestone Bug PRs that fix a bug with a specific milestone labels Dec 25, 2024

Propagate accessor flags in intersected properties

1baa828

Andarist force-pushed the keep-accessors-as-accessors-on-emitted-anonymous-class-declarations branch from d466c50 to 1baa828 Compare January 1, 2025 19:11

fixed a thing

161e1ca

Andarist commented Jan 1, 2025

View reviewed changes

Andarist added 2 commits June 30, 2025 10:40

Merge remote-tracking branch 'origin/main' into keep-accessors-as-acc…

e38b30d

…essors-on-emitted-anonymous-class-declarations

add extra test case

d29a82a

Andarist mentioned this pull request Jun 30, 2025

Merging Classes With Getters Converts Into a Property #61967

Closed

add extra test case

b43f9dd

Andarist force-pushed the keep-accessors-as-accessors-on-emitted-anonymous-class-declarations branch from bfbf4b6 to b43f9dd Compare June 30, 2025 09:30

rbuckton removed their assignment Jun 30, 2025

DanielRosenwasser approved these changes Jun 30, 2025

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github-project-automation bot moved this from Not started to Needs merge in PR Backlog Jun 30, 2025

jakebailey reviewed Jun 30, 2025

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split comment into multiple lines

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jakebailey approved these changes Jun 30, 2025

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jakebailey merged commit c35b143 into microsoft:main Jun 30, 2025
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Keep accessors as accessors in emitted anonymous class declarations #60853

Keep accessors as accessors in emitted anonymous class declarations #60853

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		// classes created by mixins are represented as intersections and overriding a property in a derived class redefines it completely at runtime
		// so a get accessor can't be merged with a set accessor in a base class, for that reason the accessor flags are only used when they are the same in all consistuents

Keep accessors as accessors in emitted anonymous class declarations #60853

Keep accessors as accessors in emitted anonymous class declarations #60853

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