Replace ForEachReturnStatement closure with direct kind-switched walk by mds-ant · Pull Request #4239 · microsoft/typescript-go

mds-ant · 2026-06-08T09:20:19Z

Context

ForEachReturnStatement allocated a self-referential closure on every call and recursed via ForEachChild, which dispatches through an interface and visits expression-typed children (conditions, initializers) that the closure immediately rejects.

This PR

This PR rewrites ForEachReturnStatement as a self-recursive package-level function that switches on Kind and recurses only into the statement-typed children of each construct. This removes the per-call closure allocation, the ForEachChild interface dispatch, and the wasted visits to non-statement children. The set of traversed kinds is unchanged.

This PR was assisted by Claude Code.

Performance

hyperfine benchmark:

Benchmark 1: ./built/local/tsgo_main --noEmit -p ~/Code/vscode/src/tsconfig.json
  Time (mean ± σ):      5.012 s ±  0.108 s    [User: 25.429 s, System: 1.427 s]
  Range (min … max):    4.825 s …  5.273 s    25 runs

Benchmark 2: ./built/local/tsgo_optimized --noEmit -p ~/Code/vscode/src/tsconfig.json
  Time (mean ± σ):      4.950 s ±  0.099 s    [User: 24.952 s, System: 1.421 s]
  Range (min … max):    4.771 s …  5.158 s    25 runs

Memory allocations (measured using --noEmit --singleThreaded --diagnostics):

Before	After	Delta
20,918,299	20,403,098	–2.46%

goos: darwin
goarch: arm64
pkg: github.com/microsoft/typescript-go/internal/ast
cpu: Apple M1 Pro
                                                                       │ ./out_before.txt │           ./out_after.txt           │
                                                                       │      sec/op      │   sec/op     vs base                │
ForEachReturnStatement/checker.ts-10                                          402.8µ ± 1%   259.6µ ± 1%  -35.56% (p=0.000 n=10)
ForEachReturnStatement/Herebyfile.mjs-10                                     2328.0n ± 0%   804.1n ± 0%  -65.46% (p=0.000 n=10)
ForEachReturnStatement/jsxComplexSignatureHasApplicabilityError.tsx-10       118.50n ± 0%   24.45n ± 0%  -79.37% (p=0.000 n=10)
geomean                                                                       4.807µ        1.722µ       -64.19%

                                                                       │ ./out_before.txt │              ./out_after.txt              │
                                                                       │       B/op       │     B/op      vs base                     │
ForEachReturnStatement/checker.ts-10                                         83.81Ki ± 0%    0.00Ki ± 0%  -100.00% (p=0.000 n=10)
ForEachReturnStatement/Herebyfile.mjs-10                                     1.281Ki ± 0%   0.000Ki ± 0%  -100.00% (p=0.000 n=10)
ForEachReturnStatement/jsxComplexSignatureHasApplicabilityError.tsx-10         96.00 ± 0%      0.00 ± 0%  -100.00% (p=0.000 n=10)

                                                                       │ ./out_before.txt │             ./out_after.txt              │
                                                                       │    allocs/op     │  allocs/op   vs base                     │
ForEachReturnStatement/checker.ts-10                                          5.364k ± 0%   0.000k ± 0%  -100.00% (p=0.000 n=10)
ForEachReturnStatement/Herebyfile.mjs-10                                       82.00 ± 0%     0.00 ± 0%  -100.00% (p=0.000 n=10)
ForEachReturnStatement/jsxComplexSignatureHasApplicabilityError.tsx-10         6.000 ± 0%    0.000 ± 0%  -100.00% (p=0.000 n=10)

ForEachReturnStatement allocated a self-referential closure on every call and recursed via ForEachChild, which dispatches through an interface and visits expression-typed children (conditions, initializers) that the closure immediately rejects. Rewrite as a self-recursive package-level function that switches on Kind and recurses only into the statement-typed children of each construct. This removes the per-call closure allocation, the ForEachChild interface dispatch, and the wasted visits to non-statement children. The set of traversed kinds is unchanged.

Copilot

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Refactors ForEachReturnStatement to use explicit, kind-specific traversal (instead of generic ForEachChild) and adds a small helper to traverse NodeLists, with an added nil guard for safety.

Changes:

Rewrote ForEachReturnStatement to explicitly recurse through statement-bearing node kinds.
Added forEachReturnStatementInNodeList to traverse statement lists (*NodeList).
Added a nil guard to avoid panics when called with a nil node.

jakebailey · 2026-06-08T15:33:08Z

hyperfine benchmark

You omitted the comparison, no? I suspect this might be within noise when end to end

jakebailey · 2026-06-08T16:35:30Z

This is probably fine, but an alternative approach would have been to copy the parent pointer code where we just reuse the closure, I think.

DanielRosenwasser · 2026-06-08T17:52:52Z

@typescript-bot perf test this

typescript-automation · 2026-06-08T17:52:56Z

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

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

typescript-automation · 2026-06-08T18:20:02Z

@DanielRosenwasser
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 - native}
_Errors	₄	₄	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_{81,785 (± 0.03%)}	_{81,775 (± 0.05%)}	_~	_81,731	_81,823	_{p=0.810 n=6}
_Types	_98,821	_98,821	_~	_~	_~	_{p=1.000 n=6}
_{Memory Used}	_{179,780k (± 0.45%)}	_{179,587k (± 0.38%)}	_~	_178,655k	_180,291k	_{p=0.575 n=6}
_{Memory Allocs}	_{1,768,045 (± 0.01%)}	_{1,762,829 (± 0.02%)}	_{-5,215 (- 0.29%)}	_1,762,280	_1,763,246	_{p=0.005 n=6}
_{Config Time}	_{0.000s (±244.70%)}	_{0.000s (±154.76%)}	_~	_0.000s	_0.001s	_{p=0.595 n=6}
_{Parse Time}	_{0.066s (± 7.10%)}	_{0.065s (± 5.50%)}	_~	_0.061s	_0.070s	_{p=0.747 n=6}
_{Bind Time}	_{0.021s (±11.33%)}	_{0.019s (±19.39%)}	_~	_0.015s	_0.026s	_{p=0.223 n=6}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=6}
_{Emit Time}	_{0.987s (± 1.19%)}	_{1.008s (± 1.30%)}	_{+0.021s (+ 2.09%)}	_0.996s	_1.030s	_{p=0.019 n=6}
_{Total Time}	_{1.076s (± 1.02%)}	_{1.093s (± 1.35%)}	_~	_1.076s	_1.113s	_{p=0.054 n=6}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_{884,411 (± 0.09%)}	_{884,627 (± 0.11%)}	_~	_883,405	_886,476	_{p=0.689 n=6}
_Types	_{263,954 (± 0.00%)}	_{263,954 (± 0.00%)}	_~	_263,952	_263,957	_{p=0.930 n=6}
_{Memory Used}	_{831,381k (± 0.04%)}	_{831,252k (± 0.10%)}	_~	_830,821k	_832,877k	_{p=0.173 n=6}
_{Memory Allocs}	_{6,703,061 (± 0.23%)}	_{6,621,076 (± 0.12%)}	_{-81,986 (- 1.22%)}	_6,613,809	_6,636,284	_{p=0.005 n=6}
_{Config Time}	_{0.026s (±14.91%)}	_{0.024s (±12.82%)}	_~	_0.021s	_0.029s	_{p=0.277 n=6}
_{Parse Time}	_{0.268s (± 4.78%)}	_{0.264s (± 2.85%)}	_~	_0.257s	_0.274s	_{p=0.335 n=6}
_{Bind Time}	_{0.048s (±29.02%)}	_{0.053s (±27.95%)}	_~	_0.041s	_0.079s	_{p=0.294 n=6}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=6}
_{Emit Time}	_{2.040s (± 1.54%)}	_{2.056s (± 2.35%)}	_~	_1.986s	_2.105s	_{p=0.575 n=6}
_{Total Time}	_{2.396s (± 0.91%)}	_{2.409s (± 1.43%)}	_~	_2.368s	_2.460s	_{p=0.469 n=6}
_{mui-docs - native}
_Errors	_{11,246 (± 0.02%)}	_{11,245 (± 0.03%)}	_~	_11,240	_11,247	_{p=0.599 n=6}
_Symbols	_4,179,255	_4,179,255	_~	_~	_~	_{p=1.000 n=6}
_Types	_1,526,525	_1,526,525	_~	_~	_~	_{p=1.000 n=6}
_{Memory Used}	_{4,864,996k (± 0.03%)}	_{4,865,039k (± 0.02%)}	_~	_4,864,054k	_4,866,769k	_{p=0.810 n=6}
_{Memory Allocs}	_{108,956,580 (±16.71%)}	_{98,058,780 (±22.01%)}	_~	_77,631,680	_127,368,477	_{p=0.378 n=6}
_{Config Time}	_{0.024s (±10.55%)}	_{0.027s (±14.19%)}	_~	_0.021s	_0.033s	_{p=0.124 n=6}
_{Parse Time}	_{1.365s (±21.53%)}	_{1.196s (±24.29%)}	_~	_0.890s	_1.593s	_{p=0.378 n=6}
_{Bind Time}	_0.002s	_{0.003s (±19.35%)}	_{🔻+0.001s (+33.33%)}	_0.002s	_0.003s	_{p=0.025 n=6}
_{Check Time}	_{19.170s (± 0.49%)}	_{19.181s (± 0.59%)}	_~	_19.081s	_19.401s	_{p=1.000 n=6}
_{Emit Time}	_{0.539s (± 4.69%)}	_{0.602s (±19.01%)}	_~	_0.524s	_0.834s	_{p=0.109 n=6}
_{Total Time}	_{21.900s (± 1.30%)}	_{21.813s (± 1.67%)}	_~	_21.424s	_22.347s	_{p=0.575 n=6}
_{self-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,396,711	_1,396,711	_~	_~	_~	_{p=1.000 n=6}
_Types	_442,164	_442,164	_~	_~	_~	_{p=1.000 n=6}
_{Memory Used}	_{1,649,669k (± 0.26%)}	_{1,653,474k (± 0.47%)}	_~	_1,642,501k	_1,663,009k	_{p=0.471 n=6}
_{Memory Allocs}	_{57,512,422 (± 0.04%)}	_{57,038,889 (± 0.11%)}	_{-473,533 (- 0.82%)}	_56,983,839	_57,125,517	_{p=0.005 n=6}
_{Config Time}	_{0.019s (±27.66%)}	_{0.019s (±14.53%)}	_~	_0.016s	_0.023s	_{p=1.000 n=6}
_{Parse Time}	_{0.265s (± 2.23%)}	_{0.274s (± 2.22%)}	_{+0.010s (+ 3.59%)}	_0.265s	_0.282s	_{p=0.045 n=6}
_{Bind Time}	_{0.000s (±154.76%)}	_{0.000s (±244.70%)}	_~	_0.000s	_0.001s	_{p=0.595 n=6}
_{Check Time}	_{2.693s (± 0.50%)}	_{2.726s (± 0.62%)}	_{+0.033s (+ 1.21%)}	_2.711s	_2.758s	_{p=0.013 n=6}
_{Emit Time}	_{0.264s (± 4.16%)}	_{0.274s (± 3.45%)}	_~	_0.260s	_0.289s	_{p=0.091 n=6}
_{Total Time}	_{33.742s (± 0.70%)}	_{34.083s (± 0.56%)}	_{+0.341s (+ 1.01%)}	_33.811s	_34.383s	_{p=0.045 n=6}
_{self-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_338,176	_338,176	_~	_~	_~	_{p=1.000 n=6}
_Types	_199,522	_199,522	_~	_~	_~	_{p=1.000 n=6}
_{Memory Used}	_{332,151k (± 0.03%)}	_{332,182k (± 0.06%)}	_~	_331,874k	_332,467k	_{p=0.810 n=6}
_{Memory Allocs}	_{2,557,485 (± 0.02%)}	_{2,532,299 (± 0.05%)}	_{-25,186 (- 0.98%)}	_2,531,054	_2,533,938	_{p=0.005 n=6}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=6}
_{Parse Time}	_{0.134s (± 2.98%)}	_{0.139s (± 6.01%)}	_~	_0.129s	_0.151s	_{p=0.423 n=6}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=6}
_{Check Time}	_{1.395s (± 1.22%)}	_{1.401s (± 0.92%)}	_~	_1.389s	_1.420s	_{p=0.575 n=6}
_{Emit Time}	_{0.082s (± 7.82%)}	_{0.091s (±10.79%)}	_~	_0.075s	_0.100s	_{p=0.092 n=6}
_{Total Time}	_{1.661s (± 0.94%)}	_{1.687s (± 1.05%)}	_{+0.026s (+ 1.57%)}	_1.661s	_1.706s	_{p=0.045 n=6}
_{ts-pre-modules - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_97,488	_97,488	_~	_~	_~	_{p=1.000 n=6}
_Types	₃₅₆	₃₅₆	_~	_~	_~	_{p=1.000 n=6}
_{Memory Used}	_{133,422k (± 0.03%)}	_{133,415k (± 0.03%)}	_~	_133,357k	_133,445k	_{p=0.689 n=6}
_{Memory Allocs}	_{193,758 (± 0.25%)}	_{193,489 (± 0.22%)}	_~	_192,989	_193,978	_{p=0.471 n=6}
_{Config Time}	_0.001s	_{0.001s (±48.94%)}	_~	_0.000s	_0.001s	_{p=0.405 n=6}
_{Parse Time}	_{0.120s (± 3.51%)}	_{0.116s (± 3.63%)}	_~	_0.112s	_0.123s	_{p=0.145 n=6}
_{Bind Time}	_{0.038s (±12.32%)}	_{0.041s (± 8.04%)}	_~	_0.037s	_0.046s	_{p=0.421 n=6}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=6}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{0.162s (± 2.01%)}	_{0.161s (± 2.29%)}	_~	_0.157s	_0.166s	_{p=0.468 n=6}
_{vscode - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_6,561,217	_6,561,217	_~	_~	_~	_{p=1.000 n=6}
_Types	_2,306,245	_2,306,245	_~	_~	_~	_{p=1.000 n=6}
_{Memory Used}	_{4,436,756k (± 0.04%)}	_{4,437,792k (± 0.03%)}	_~	_4,435,606k	_4,440,305k	_{p=0.173 n=6}
_{Memory Allocs}	_{31,819,103 (± 0.12%)}	_{31,271,431 (± 0.09%)}	_{-547,672 (- 1.72%)}	_31,247,942	_31,324,012	_{p=0.005 n=6}
_{Config Time}	_{0.069s (± 4.25%)}	_{0.062s (± 8.52%)}	_~	_0.056s	_0.070s	_{p=0.065 n=6}
_{Parse Time}	_{0.855s (± 2.78%)}	_{0.836s (± 4.16%)}	_~	_0.780s	_0.879s	_{p=0.336 n=6}
_{Bind Time}	_{0.151s (±30.11%)}	_{0.167s (±34.18%)}	_~	_0.128s	_0.252s	_{p=1.000 n=6}
_{Check Time}	_{8.453s (± 0.59%)}	_{8.536s (± 1.57%)}	_~	_8.388s	_8.782s	_{p=0.173 n=6}
_{Emit Time}	_{2.245s (± 6.30%)}	_{2.072s (±10.69%)}	_~	_1.828s	_2.340s	_{p=0.230 n=6}
_{Total Time}	_{11.792s (± 1.13%)}	_{11.694s (± 1.04%)}	_~	_11.539s	_11.873s	_{p=0.230 n=6}
_{webpack - native}
_Errors	₅₈₃	₅₈₃	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_717,611	_717,611	_~	_~	_~	_{p=1.000 n=6}
_Types	_339,294	_339,294	_~	_~	_~	_{p=1.000 n=6}
_{Memory Used}	_{564,922k (± 0.02%)}	_{564,766k (± 0.03%)}	_~	_564,573k	_565,058k	_{p=0.109 n=6}
_{Memory Allocs}	_{4,097,019 (± 0.92%)}	_{4,050,216 (± 0.32%)}	_{-46,803 (- 1.14%)}	_4,033,174	_4,068,066	_{p=0.013 n=6}
_{Config Time}	_{0.009s (±25.20%)}	_{0.010s (±22.32%)}	_~	_0.007s	_0.013s	_{p=0.463 n=6}
_{Parse Time}	_{0.152s (± 3.33%)}	_{0.150s (± 5.14%)}	_~	_0.140s	_0.160s	_{p=0.809 n=6}
_{Bind Time}	_{0.028s (± 8.91%)}	_{0.027s (±32.91%)}	_~	_0.021s	_0.045s	_{p=0.294 n=6}
_{Check Time}	_{1.090s (± 1.34%)}	_{1.078s (± 0.47%)}	_~	_1.072s	_1.085s	_{p=0.149 n=6}
_{Emit Time}	_0.001s	_{0.002s (±36.48%)}	_~	_0.001s	_0.002s	_{p=0.071 n=6}
_{Total Time}	_{1.293s (± 1.16%)}	_{1.278s (± 0.73%)}	_~	_1.266s	_1.286s	_{p=0.127 n=6}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,060,815	_1,060,815	_~	_~	_~	_{p=1.000 n=6}
_Types	_384,533	_384,533	_~	_~	_~	_{p=1.000 n=6}
_{Memory Used}	_{638,301k (± 0.01%)}	_{638,335k (± 0.01%)}	_~	_638,289k	_638,451k	_{p=0.230 n=6}
_{Memory Allocs}	_{5,161,389 (± 0.07%)}	_{5,106,983 (± 0.07%)}	_{-54,406 (- 1.05%)}	_5,103,715	_5,112,259	_{p=0.005 n=6}
_{Config Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=6}
_{Parse Time}	_{0.122s (± 4.80%)}	_{0.116s (± 8.35%)}	_~	_0.104s	_0.126s	_{p=0.228 n=6}
_{Bind Time}	_{0.025s (±19.51%)}	_{0.029s (±25.58%)}	_~	_0.021s	_0.036s	_{p=0.332 n=6}
_{Check Time}	_{1.100s (± 0.51%)}	_{1.102s (± 1.10%)}	_~	_1.081s	_1.117s	_{p=0.422 n=6}
_{Emit Time}	_{0.001s (±109.43%)}	_{0.001s (±48.94%)}	_~	_0.000s	_0.001s	_{p=0.282 n=6}
_{Total Time}	_{1.254s (± 0.58%)}	_{1.252s (± 1.21%)}	_~	_1.240s	_1.272s	_{p=0.688 n=6}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
mui-docs - native
self-build-src - native
self-compiler - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₆
_Baseline	_baseline	₆

lsp

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-UnionsLSP - native}
_{Req 1 - updateOpen}	_{9ms (± 5.53%)}	_{9ms (± 5.53%)}	_~	_9ms	_10ms	_{p=1.000 n=6}
_{Req 2 - geterr}	_{945ms (± 0.72%)}	_{959ms (± 1.01%)}	_{+14ms (+ 1.43%)}	_944ms	_973ms	_{p=0.024 n=6}
_{Req 3 - references}	_{46ms (± 7.55%)}	_{46ms (± 8.86%)}	_~	_42ms	_51ms	_{p=0.746 n=6}
_{Req 4 - navto}	_{16ms (± 2.58%)}	_{20ms (±21.18%)}	_{🔻+4ms (+23.16%)}	_16ms	_26ms	_{p=0.026 n=6}
_{Req 5 - completionInfo count}	_1,357	_1,357	_~	_~	_~	_{p=1.000 n=6}
_{Req 5 - completionInfo}	_{14ms (±10.63%)}	_{17ms (±25.62%)}	_~	_13ms	_24ms	_{p=0.253 n=6}
_{CompilerLSP - native}
_{Req 1 - updateOpen}	_10ms	_{11ms (± 5.21%)}	_~	_10ms	_11ms	_{p=0.071 n=6}
_{Req 2 - geterr}	_{437ms (± 2.27%)}	_{437ms (± 2.80%)}	_~	_422ms	_456ms	_{p=0.936 n=6}
_{Req 3 - references}	_{47ms (± 3.29%)}	_{46ms (± 4.66%)}	_~	_44ms	_49ms	_{p=0.325 n=6}
_{Req 4 - navto}	_{17ms (± 2.42%)}	_{17ms (± 4.47%)}	_~	_16ms	_18ms	_{p=1.000 n=6}
_{Req 5 - completionInfo count}	_1,519	_1,519	_~	_~	_~	_{p=1.000 n=6}
_{Req 5 - completionInfo}	_{18ms (±10.53%)}	_{18ms (±10.53%)}	_~	_16ms	_21ms	_{p=0.739 n=6}

System info unknown

Hosts

native

Scenarios

CompilerLSP - native
Compiler-UnionsLSP - native
xstate-main-1-LSP - native

_Benchmark	_Name	_Iterations
_Current	_pr	₆
_Baseline	_baseline	₆

startup

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{lsp-startup - native}
_{Execution time}	_{4.88ms (±516.55%)}	_{4.88ms (±516.54%)}	_{-0.00ms (- 0.07%)}	_0.00ms	_491.42ms	_{p=0.000 n=600}
_{tsgo-startup - native}
_{Execution time}	_{6.00ms (±516.54%)}	_{5.96ms (±516.55%)}	_{-0.04ms (- 0.71%)}	_0.00ms	_603.82ms	_{p=0.000 n=600}

System info unknown

Hosts

native

Scenarios

lsp-startup - native
tsgo-startup - native

_Benchmark	_Name	_Iterations
_Current	_pr	₆
_Baseline	_baseline	₆

Developer Information:

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Copilot AI review requested due to automatic review settings June 8, 2026 09:20

Copilot AI reviewed Jun 8, 2026

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Add BenchmarkForEachReturnStatement

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RyanCavanaugh added the No linked issue This PR doesn't say what bug it fixes label Jun 8, 2026

RyanCavanaugh added this to the Possible Improvement milestone Jun 8, 2026

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Replace ForEachReturnStatement closure with direct kind-switched walk#4239

Replace ForEachReturnStatement closure with direct kind-switched walk#4239
mds-ant wants to merge 2 commits into
microsoft:mainfrom
mds-ant:perf/foreach-return-walk

mds-ant commented Jun 8, 2026 •

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jakebailey commented Jun 8, 2026

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jakebailey commented Jun 8, 2026

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jakebailey commented Jun 8, 2026

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mds-ant commented Jun 8, 2026 •

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