Fixed a crash caused by circularly-reentrant `getEffectsSignature` by Andarist · Pull Request #63026 · microsoft/TypeScript

Mateusz Burzyński (Andarist) · 2026-01-21T10:20:26Z

fixes#63015
caused by https://github.com/microsoft/TypeScript/pull/62243/files#r2264931395

With the change above, some of the function-like type-level nodes lostContainerFlags.IsControlFlowContainer. It turns out that, despite them being type-level nodes, it was still important for them to be treated as flow containers. Or rather, it was important for them to get their own detached~ flow node as currentFlow in the bindContainer's branch handling ContainerFlags.IsControlFlowContainer.

Without that flag on them the nodes received .flowNode that was attached to the flow graph of the containing control flow container. Where with the flag they received FlowFlags.Start node that usually no other flow nodes would be attached to, unless one would write an incorrect program with narrowing expressions within type level nodes (those would attach to that FlowFlags.Start as that was set as currentFlow) in situations akin to this one:

typeSomeTypeAlias={[Math.random() ? foo : bar]: string}// error

So all of that caused typeof x within those function-like type-level nodes to get narrowed by the containing container's flow and the code managed to infinitely recurse in the reported code:

unionOfDifferentReturnType1(true);constunionOfDifferentReturnType1: {(a: any): number;}|{(a: number): typeofDate;};

In here, the Date in the typeof query was being narrowed by FlowFlags.Call node but that depends on the annotated type of unionOfDifferentReturnType1 (it depends on getEffectsSignature and that depends on explicitly annotated return types).

It seemed to me it would be possible to create a similar crash in 5.9 and I tried weird things (I added them as tests) but couldn't make it happen. The closest thing I got was this somewhat surprising error:

functiontest4(arg: string|number,whatever: any){if(typeofarg==="string"){b()typeFirst=typeofarg// Type alias 'First' circularly references itself.(2456)typeTest=()=>Firstconstb: Test=whateverreturnb}returnundefined;}

I think this means that type aliases have reentrancy protection already implemented and the reported code crashes because it manages to slip through codepaths that don't have it (anonymous type nodes don't implement pushTypeResolution+popTypeResolution etc).

All of that led me to exploring the inconsistencies around typeof queries, like here:

functiontest1(a: number|string){if(typeofa==="number"){constfn=(arg: typeofa)=>true;returnfn;}return;}test1(0)?.(100);// oktest1(0)?.("");// errorfunctiontest2(a: number|string){if(typeofa==="number"){constfn: {(arg: typeofa): boolean;}=()=>true;returnfn;}return;}test2(0)?.(100);// oktest2(0)?.("");// ok ?

So I figured out, I would prefer to keep their behavior change accidentally implemented in #62243 . It would be nice if they would behave in the same way in the example above. It seemed the easiest to just eagerly set a "zero value" links.effectsSignature before resolving the true value. That's a pretty common pattern used across the codebase.

FWIW, I have also briefly explored disabling control flow narrowing within type-only nodes but that broke a couple of existing explicit tests.

Alternative fixes I have considered:

reverting the ContainerFlags.IsControlFlowContainer changes + fine-tuning seenThisKeyword tracking
adding an extra codepath to bindContainer, smth like:

if(ContainerFlags.IsFunctionLike){constsaveCurrentFlow=currentFlow;currentFlow=createFlowNode(FlowFlags.Start,/*node*/undefined,/*antecedent*/undefined);bindChildren(node);currentFlow=saveCurrentFlow;}

using links.effectsSignature = resolvingEffectsSignature strategy

EDIT:// at the end, I have refactored the PR to choose the first option of"reverting the ContainerFlags.IsControlFlowContainer changes + fine-tuning seenThisKeyword tracking", as requested here

cc Gabriela Araujo Britto (@gabritto)

…ctsSignature

Anders Hejlsberg (ahejlsberg) · 2026-01-23T15:50:25Z

I'm somewhat queasy about having to put in stopgap recursion limiter where we previously didn't need it. We use a similar pattern in some places, but it always comes with the downside of possibly observing different results from functions that are supposed to just lazily compute immutable values. My preference would be to restore the original ContainerFlags.IsControlFlowContainer values and get closer to where we were before.

Mateusz Burzyński (Andarist) · 2026-01-23T16:29:11Z

Thanks for the feedback. I’ll work on the suggested solution

…ctsSignature

Gabriela Araujo Britto (gabritto)

Looks good except for the (leftover?) change in checker.ts.

…ctsSignature

Gabriela Araujo Britto (gabritto) · 2026-02-02T17:21:08Z

TypeScript Bot (@typescript-bot) test it

TypeScript Bot (typescript-bot) · 2026-02-02T17:21:13Z

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 (typescript-bot) · 2026-02-02T17:40:38Z

Gabriela Araujo Britto (@gabritto) Here are the results of running the user tests with tsc comparing main and refs/pull/63026/merge:

There were infrastructure failures potentially unrelated to your change:

1 instance of "Package install failed"
1 instance of "Git clone failed"

Otherwise...

Everything looks good!

TypeScript Bot (typescript-bot) · 2026-02-02T17:43:55Z

Hey Gabriela Araujo Britto (@gabritto), the results of running the DT tests are ready.

Everything looks the same!

You can check the log here.

TypeScript Bot (typescript-bot) · 2026-02-02T18:19:59Z

Gabriela Araujo Britto (@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	₃	₃	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_62,370	_62,370	_~	_~	_~	_{p=1.000 n=6}
_Types	_50,387	_50,387	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{194,994k (± 0.92%)}	_{196,232k (± 0.10%)}	_~	_195,988k	_196,485k	_{p=0.230 n=6}
_{Parse Time}	_{1.60s (± 2.35%)}	_{1.59s (± 1.93%)}	_~	_1.56s	_1.63s	_{p=0.809 n=6}
_{Bind Time}	_{0.92s (± 1.07%)}	_{0.90s (± 1.30%)}	_{-0.02s (- 2.18%)}	_0.88s	_0.91s	_{p=0.016 n=6}
_{Check Time}	_{11.98s (± 0.45%)}	_{11.98s (± 0.21%)}	_~	_11.95s	_12.02s	_{p=0.748 n=6}
_{Emit Time}	_{3.32s (± 3.80%)}	_{3.46s (± 4.33%)}	_~	_3.23s	_3.58s	_{p=0.336 n=6}
_{Total Time}	_{17.83s (± 0.85%)}	_{17.93s (± 1.01%)}	_~	_17.68s	_18.14s	_{p=0.575 n=6}
_{angular-1 - node (v18.15.0, x64)}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_955,823	_955,823	_~	_~	_~	_{p=1.000 n=6}
_Types	_415,853	_415,853	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{1,254,077k (± 0.00%)}	_{1,254,958k (± 0.00%)}	_{+881k (+ 0.07%)}	_1,254,926k	_1,255,003k	_{p=0.005 n=6}
_{Parse Time}	_{8.01s (± 0.59%)}	_{8.02s (± 0.91%)}	_~	_7.93s	_8.09s	_{p=0.746 n=6}
_{Bind Time}	_{2.39s (± 1.58%)}	_{2.38s (± 0.35%)}	_~	_2.37s	_2.39s	_{p=1.000 n=6}
_{Check Time}	_{38.71s (± 0.34%)}	_{38.74s (± 0.50%)}	_~	_38.51s	_39.04s	_{p=1.000 n=6}
_{Emit Time}	_{17.84s (± 0.86%)}	_{17.83s (± 0.69%)}	_~	_17.61s	_17.96s	_{p=0.936 n=6}
_{Total Time}	_{66.95s (± 0.21%)}	_{66.98s (± 0.33%)}	_~	_66.61s	_67.27s	_{p=0.689 n=6}
_{mui-docs - node (v18.15.0, x64)}
_Errors	_11,439	_11,439	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_2,701,943	_2,701,943	_~	_~	_~	_{p=1.000 n=6}
_Types	_930,574	_930,574	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,037,297k (± 0.00%)}	_{3,038,463k (± 0.00%)}	_{+1,166k (+ 0.04%)}	_3,038,302k	_3,038,624k	_{p=0.005 n=6}
_{Parse Time}	_{10.35s (± 0.44%)}	_{10.31s (± 0.25%)}	_~	_10.28s	_10.35s	_{p=0.077 n=6}
_{Bind Time}	_{2.76s (± 0.61%)}	_{2.78s (± 0.78%)}	_~	_2.76s	_2.82s	_{p=0.070 n=6}
_{Check Time}	_{110.90s (± 0.86%)}	_{110.88s (± 1.69%)}	_~	_109.56s	_114.62s	_{p=0.575 n=6}
_{Emit Time}	_{0.38s (± 1.99%)}	_{0.39s (± 2.11%)}	_~	_0.38s	_0.40s	_{p=0.120 n=6}
_{Total Time}	_{124.39s (± 0.76%)}	_{124.36s (± 1.50%)}	_~	_123.08s	_128.10s	_{p=0.575 n=6}
_{self-build-src - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,252,475	_1,252,487	_{+12 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_259,933	_259,932	_{-1 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{2,998,683k (± 9.91%)}	_{2,882,938k (±13.05%)}	_~	_2,396,315k	_3,127,006k	_{p=0.230 n=6}
_{Parse Time}	_{6.63s (± 0.72%)}	_{6.66s (± 0.77%)}	_~	_6.58s	_6.72s	_{p=0.336 n=6}
_{Bind Time}	_{2.24s (± 1.30%)}	_{2.22s (± 1.29%)}	_~	_2.17s	_2.24s	_{p=0.418 n=6}
_{Check Time}	_{42.85s (± 0.74%)}	_{42.91s (± 0.39%)}	_~	_42.74s	_43.12s	_{p=0.810 n=6}
_{Emit Time}	_{3.44s (± 3.31%)}	_{3.50s (± 2.76%)}	_~	_3.32s	_3.60s	_{p=0.230 n=6}
_{Total Time}	_{55.17s (± 0.65%)}	_{55.30s (± 0.38%)}	_~	_55.03s	_55.51s	_{p=0.471 n=6}
_{self-build-src-public-api - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,252,475	_1,252,487	_{+12 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_259,933	_259,932	_{-1 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{3,062,042k (± 9.65%)}	_{3,189,398k (± 0.03%)}	_{🔻+127,356k (+ 4.16%)}	_3,188,465k	_3,190,556k	_{p=0.005 n=6}
_{Parse Time}	_{6.73s (± 1.14%)}	_{6.81s (± 0.90%)}	_{+0.08s (+ 1.14%)}	_6.69s	_6.86s	_{p=0.045 n=6}
_{Bind Time}	_{2.27s (± 0.65%)}	_{2.26s (± 1.55%)}	_~	_2.23s	_2.33s	_{p=0.226 n=6}
_{Check Time}	_{43.08s (± 0.46%)}	_{43.13s (± 0.23%)}	_~	_43.04s	_43.32s	_{p=0.810 n=6}
_{Emit Time}	_{3.48s (± 0.81%)}	_{3.51s (± 1.54%)}	_~	_3.45s	_3.59s	_{p=0.423 n=6}
_{Total Time}	_{55.56s (± 0.46%)}	_{55.70s (± 0.20%)}	_~	_55.56s	_55.87s	_{p=0.336 n=6}
_{self-compiler - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_264,630	_264,631	_{+1 (+ 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_104,073	_104,072	_{-1 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{443,122k (± 0.01%)}	_{443,546k (± 0.01%)}	_{+424k (+ 0.10%)}	_443,463k	_443,609k	_{p=0.005 n=6}
_{Parse Time}	_{3.50s (± 0.53%)}	_{3.50s (± 1.40%)}	_~	_3.46s	_3.58s	_{p=0.467 n=6}
_{Bind Time}	_{1.39s (± 1.02%)}	_{1.37s (± 0.55%)}	_{-0.02s (- 1.32%)}	_1.36s	_1.38s	_{p=0.032 n=6}
_{Check Time}	_{19.14s (± 0.50%)}	_{19.21s (± 0.23%)}	_~	_19.16s	_19.29s	_{p=0.229 n=6}
_{Emit Time}	_{1.54s (± 0.68%)}	_{1.53s (± 0.96%)}	_~	_1.51s	_1.55s	_{p=0.073 n=6}
_{Total Time}	_{25.58s (± 0.35%)}	_{25.62s (± 0.22%)}	_~	_25.55s	_25.67s	_{p=0.376 n=6}
_{ts-pre-modules - node (v18.15.0, x64)}
_Errors	₇₄	₇₄	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_225,493	_225,493	_~	_~	_~	_{p=1.000 n=6}
_Types	_94,373	_94,373	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{369,928k (± 0.04%)}	_{370,216k (± 0.04%)}	_{+288k (+ 0.08%)}	_370,088k	_370,409k	_{p=0.013 n=6}
_{Parse Time}	_{2.82s (± 1.05%)}	_{2.84s (± 1.23%)}	_~	_2.78s	_2.88s	_{p=0.333 n=6}
_{Bind Time}	_{1.65s (± 0.91%)}	_{1.65s (± 1.11%)}	_~	_1.62s	_1.67s	_{p=0.869 n=6}
_{Check Time}	_{16.60s (± 0.26%)}	_{16.64s (± 0.50%)}	_~	_16.55s	_16.78s	_{p=0.420 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{21.07s (± 0.34%)}	_{21.14s (± 0.43%)}	_~	_21.02s	_21.28s	_{p=0.298 n=6}
_{vscode - node (v18.15.0, x64)}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_4,190,479	_4,190,479	_~	_~	_~	_{p=1.000 n=6}
_Types	_1,328,097	_1,328,097	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,983,933k (± 0.01%)}	_{3,985,145k (± 0.00%)}	_{+1,211k (+ 0.03%)}	_3,985,044k	_3,985,256k	_{p=0.005 n=6}
_{Parse Time}	_{16.12s (± 0.44%)}	_{16.30s (± 2.38%)}	_~	_16.02s	_17.07s	_{p=0.689 n=6}
_{Bind Time}	_{5.69s (± 1.90%)}	_{5.45s (± 0.38%)}	_{🟩-0.24s (- 4.16%)}	_5.43s	_5.48s	_{p=0.010 n=6}
_{Check Time}	_{117.77s (± 4.08%)}	_{117.84s (± 3.33%)}	_~	_113.60s	_123.02s	_{p=0.810 n=6}
_{Emit Time}	_{53.46s (± 9.80%)}	_{53.67s (± 8.78%)}	_~	_48.18s	_60.32s	_{p=0.810 n=6}
_{Total Time}	_{193.04s (± 3.30%)}	_{193.26s (± 2.72%)}	_~	_187.94s	_200.52s	_{p=1.000 n=6}
_{webpack - node (v18.15.0, x64)}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_396,269	_396,269	_~	_~	_~	_{p=1.000 n=6}
_Types	_175,363	_175,363	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{548,943k (± 0.02%)}	_{549,613k (± 0.01%)}	_{+670k (+ 0.12%)}	_549,511k	_549,700k	_{p=0.005 n=6}
_{Parse Time}	_{4.64s (± 0.52%)}	_{4.63s (± 0.93%)}	_~	_4.55s	_4.67s	_{p=0.628 n=6}
_{Bind Time}	_{2.02s (± 1.51%)}	_{2.02s (± 1.39%)}	_~	_1.99s	_2.06s	_{p=0.871 n=6}
_{Check Time}	_{24.18s (± 1.67%)}	_{24.23s (± 0.44%)}	_~	_24.14s	_24.40s	_{p=0.423 n=6}
_{Emit Time}	_{0.01s (±48.94%)}	_{0.01s (±109.43%)}	_~	_0.00s	_0.01s	_{p=0.282 n=6}
_{Total Time}	_{30.84s (± 1.25%)}	_{30.87s (± 0.41%)}	_~	_30.73s	_31.04s	_{p=0.378 n=6}
_{xstate-main - node (v18.15.0, x64)}
_Errors	₃₀	₃₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_731,941	_731,941	_~	_~	_~	_{p=1.000 n=6}
_Types	_219,279	_219,279	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{634,933k (± 0.01%)}	_{635,823k (± 0.01%)}	_{+890k (+ 0.14%)}	_635,757k	_635,903k	_{p=0.005 n=6}
_{Parse Time}	_{3.71s (± 0.37%)}	_{3.71s (± 0.40%)}	_~	_3.69s	_3.73s	_{p=0.743 n=6}
_{Bind Time}	_{1.26s (± 0.71%)}	_1.26s	_~	_~	_~	_{p=1.000 n=6}
_{Check Time}	_{18.48s (± 0.47%)}	_{18.39s (± 0.22%)}	_~	_18.33s	_18.45s	_{p=0.078 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{23.45s (± 0.36%)}	_{23.36s (± 0.22%)}	_~	_23.28s	_23.43s	_{p=0.071 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:

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TypeScript Bot (typescript-bot) · 2026-02-02T18:43:12Z

Gabriela Araujo Britto (@gabritto) Here are the results of running the top 400 repos with tsc comparing main and refs/pull/63026/merge:

Everything looks good!

Fixed a crash caused by circularly-reentrant getEffectsSignature
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github-project-automationBot added this to PR Backlog Jan 21, 2026

github-project-automationBot moved this to Not started in PR Backlog Jan 21, 2026

TypeScript Bot (typescript-bot) assigned Gabriela Araujo Britto (gabritto)Jan 21, 2026

TypeScript Bot (typescript-bot) added the For Milestone Bug PRs that fix a bug with a specific milestone label Jan 21, 2026

Merge remote-tracking branch 'origin/main' into fix/reentrant-getEffe…
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Mateusz Burzyński (Andarist) added 3 commits January 31, 2026 08:54

bring back IsControlFlowContainer
9579094

PropagatesThisKeyword
8298766

Merge remote-tracking branch 'origin/main' into fix/reentrant-getEffe…
3d83c8c
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Gabriela Araujo Britto (gabritto) requested changes Feb 2, 2026
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Comment threadsrc/compiler/checker.ts Outdated

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Mateusz Burzyński (Andarist) added 2 commits February 2, 2026 18:18

oops, remove the old fix
bf335f5

Merge remote-tracking branch 'origin/main' into fix/reentrant-getEffe…
11bec36
…ctsSignature

Mateusz Burzyński (Andarist) requested a review from Gabriela Araujo Britto (gabritto)February 2, 2026 17:20

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Merged via the queue into microsoft:main with commit b92ec99Feb 2, 2026
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CopilotAI mentioned this pull request Feb 11, 2026
Port TypeScript #63026: Fix crash from circularly-reentrant getEffectsSignature microsoft/typescript-go#2754
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Microsoft (microsoft) locked as resolved and limited conversation to collaborators Aug 3, 2026

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Fixed a crash caused by circularly-reentrant `getEffectsSignature` - #63026

Fixed a crash caused by circularly-reentrant `getEffectsSignature`#63026
Gabriela Araujo Britto (gabritto) merged 7 commits into
microsoft:mainfrom
Andarist:fix/reentrant-getEffectsSignature

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TypeScript Bot (typescript-bot) commented Feb 2, 2026•
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