Resolve class and interface members through shared layouts by jakebailey · Pull Request #64765 · microsoft/TypeScript

Jake Bailey (jakebailey) · 2026-10-13T07:41:34Z

We currently resolve the members of an instantiated class or interface eagerly. The first time anything touches an instantiation such as Array<string>, we instantiate every declared member, copy in every inherited member from its base types, and build a fresh symbol table and property list. This is wasteful because most instantiations only ever have a few of their members accessed. Meanwhile, the names, order, and flags of the members are identical in every instantiation; only their types differ. On large projects, these mostly unused symbols and tables are a large share of checker memory.

This PR computes each class or interface's member names, order, and origins once, as a member layout that all of its instantiations share. A member's origin is one of three things: a declared member, a slot in a base type's layout, or a property of a base type looked up by name. Each instantiation holds only a slot array, and a slot is filled the first time that member is accessed. Every member goes through one code path, getLazyMember. Looking up a member by name resolves one slot, and full resolution (Properties(), getMembers()) resolves every slot, so property order and semantics don't change. Callers that need only the count, names, or flags of properties (isWeakType, getUnmatchedProperties, isEmptyResolvedType, etc.) read the layout and don't resolve anything.

Compared to main, VS Code uses 13.7% less memory and creates 47% fewer symbols; xstate uses 15.7% less memory and creates 40% fewer symbols.

Anonymous types (instantiated type literals, object literals) still resolve their members eagerly. I tried giving them shared layouts too, but nearly all of their members end up being used and they don't keep a separate symbol table today. On VS Code, that cost about 30MB more memory for almost no symbol savings.

This is the third attempt at avoiding eager member instantiation, after #64475 and #64735. Both of those keep a lazy path for individual lookups alongside the existing eager path for full resolution, so the two must agree. The feedback on them was that full resolution should simply resolve every member through a single code path. Here, the shared layout is what makes that possible: the names, order, and origins of members are known before any member is resolved, so one per-member path serves both a single lookup and full resolution.

Performance

From the perf bot (baseline is main, n=12):

Project	Memory used	Symbols	Allocs	Check time	Total time
Compiler-Unions	-4.17%	-23.23%	-0.45%	-2.25%	-2.24%
angular-1	-7.30%	-30.32%	-0.47%	~	-3.34%
mui-docs	-18.07%	-11.64%	-1.74%	-14.30%	-11.67%
strada-build-src	-2.83%	-14.62%	-0.46%	-3.42%	-1.28%
strada-compiler	-4.50%	-21.25%	-0.43%	-2.31%	-1.78%
ts-pre-modules	-5.45%	-23.67%	-1.47%	-2.97%	-2.91%
vscode	-13.57%	-46.67%	-1.76%	-7.93%	-8.12%
webpack	-10.82%	-30.35%	-2.50%	-11.23%	-9.34%
xstate-main	-14.76%	-39.59%	-2.80%	-11.86%	-8.94%

Every instantiation of a generic class or interface eagerly built a full symbol table and instantiated every own and inherited member, even though most code only ever looks at a handful of them. On large projects this dominates checker memory: VS Code creates millions of instantiated symbols that are never used. The names, order, and flags of a class or interface's members do not depend on its type arguments, so compute them once per target as a layout that records where each member comes from, and share it across instantiations. Each instantiation then only holds a slot per member, filled on first access. There is a single path for resolving a member; full resolution is just resolving every slot, so property order and semantics are unchanged. Callers that only need the count, names, or flags of properties use the layout directly so they don't force resolution.

Copilot

🟡 Changes recommended

Non-layout base lookup can return an incorrect inherited symbol, and the new resolution path lacks regression coverage.

1 open finding

Add regression test for inherited generic member resolution and ordering · New

What changed in this PR

Introduces shared member layouts to lazily resolve class and interface members, reducing checker memory and symbol creation.

Changes:

Adds shared layouts and on-demand member slots.
Uses unresolved property shapes for count/flag checks.
Updates consumers to use lazy-aware accessors.

File	Description
`tsc/internal/checker/checker.go`	Implements layout construction and lazy resolution.
`tsc/internal/checker/types.go`	Adds lazy member state and accessors.
`tsc/internal/checker/relater.go`	Avoids unnecessary property resolution.
`tsc/internal/checker/services.go`	Uses lazy-aware member enumeration.
`tsc/internal/checker/nodebuilderimpl.go`	Materializes members when serializing types.
`tsc/internal/checker/nodebuilder_hover.go`	Materializes properties for hover output.

🧠 Review effort: Balanced

Once a statement exceeds the instantiation count limit, every further instantiation yields the error type, including the base types of a class or interface instance whose members are resolved afterward. The shared layout of that class or interface still expects to find inherited members in those bases, so resolving such a member crashed. Without a shared layout, an error base type simply contributes no members, matching the behavior before shared layouts.

Building a member layout allocated a fresh entry slice, name map, and rank map every time, which made it one of the larger sources of allocation in the checker: about 10% of all bytes allocated when checking VS Code. Layouts are built often enough, and the scratch storage is discarded immediately, so keep it on the checker and reuse it instead. On VS Code, bytes allocated by layout building drop from 503MB to 86MB, total bytes allocated from 4.97GB to 4.41GB, and allocation count by about 2%.

Jake Bailey (jakebailey) · 2026-10-13T09:13:56Z

TypeScript Bot (@typescript-bot) test it

typescript-automation · 2026-10-13T09:14:02Z

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-automation · 2026-10-13T09:36:52Z

Hey Jake Bailey (@jakebailey), the results of running the DT tests are ready.

Everything looks the same!

You can check the log here.

typescript-automation · 2026-10-13T09:42:49Z

Jake Bailey (@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 - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_115,276	_88,498	_{🟩-26,778 (-23.23%)}	_~	_~	_{p=0.000 n=12}
_Types	_79,613	_79,613	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{133,242k (± 0.05%)}	_{127,681k (± 0.06%)}	_{🟩-5,561k (- 4.17%)}	_127,550k	_127,863k	_{p=0.000 n=12}
_{Memory Allocs}	_{2,190,303 (± 0.01%)}	_{2,180,469 (± 0.00%)}	_{-9,834 (- 0.45%)}	_2,180,279	_2,180,878	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.041s (± 3.96%)}	_{0.041s (± 3.76%)}	_~	_0.037s	_0.044s	_{p=0.788 n=12}
_{Bind Time}	_{0.012s (± 9.29%)}	_{0.012s (±10.37%)}	_~	_0.010s	_0.016s	_{p=0.902 n=12}
_{Check Time}	_{0.500s (± 0.83%)}	_{0.489s (± 0.68%)}	_{-0.011s (- 2.25%)}	_0.482s	_0.499s	_{p=0.000 n=12}
_{Emit Time}	_{0.271s (± 1.24%)}	_{0.264s (± 2.13%)}	_{-0.008s (- 2.83%)}	_0.249s	_0.282s	_{p=0.006 n=12}
_{Total Time}	_{0.830s (± 0.72%)}	_{0.811s (± 0.94%)}	_{-0.019s (- 2.24%)}	_0.791s	_0.834s	_{p=0.001 n=12}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_{845,812 (± 0.04%)}	_{589,381 (± 0.01%)}	_{🟩-256,431 (-30.32%)}	_589,201	_589,572	_{p=0.000 n=12}
_Types	_{248,124 (± 0.00%)}	_{248,133 (± 0.00%)}	_{+9 (+ 0.00%)}	_248,131	_248,135	_{p=0.000 n=12}
_{Memory Used}	_{746,088k (± 0.02%)}	_{691,630k (± 0.02%)}	_{🟩-54,458k (- 7.30%)}	_691,232k	_692,047k	_{p=0.000 n=12}
_{Memory Allocs}	_{12,914,282 (± 0.04%)}	_{12,853,548 (± 0.02%)}	_{-60,735 (- 0.47%)}	_12,849,165	_12,867,567	_{p=0.000 n=12}
_{Config Time}	_0.017s	_0.017s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.258s (± 2.89%)}	_{0.254s (± 2.30%)}	_~	_0.234s	_0.267s	_{p=0.401 n=12}
_{Bind Time}	_{0.060s (± 4.85%)}	_{0.062s (±12.92%)}	_~	_0.056s	_0.102s	_{p=0.863 n=12}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=12}
_{Emit Time}	_{1.557s (± 0.59%)}	_{1.493s (± 0.89%)}	_{🟩-0.065s (- 4.16%)}	_1.448s	_1.527s	_{p=0.000 n=12}
_{Total Time}	_{1.903s (± 0.44%)}	_{1.840s (± 0.90%)}	_{🟩-0.063s (- 3.34%)}	_1.794s	_1.900s	_{p=0.000 n=12}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,339,337	_3,834,053	_{🟩-505,284 (-11.64%)}	_~	_~	_{p=0.000 n=12}
_Types	_1,379,387	_1,379,387	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,774,542k (± 0.06%)}	_{2,273,308k (± 0.04%)}	_{🟩-501,233k (-18.07%)}	_2,270,529k	_2,276,308k	_{p=0.000 n=12}
_{Memory Allocs}	_{32,738,618 (± 0.07%)}	_{32,168,204 (± 0.06%)}	_{-570,414 (- 1.74%)}	_32,136,544	_32,233,801	_{p=0.000 n=12}
_{Config Time}	_0.017s	_0.017s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.484s (± 3.38%)}	_{0.510s (± 2.82%)}	_{🔻+0.026s (+ 5.39%)}	_0.480s	_0.558s	_{p=0.023 n=12}
_{Bind Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{8.835s (± 0.23%)}	_{7.572s (± 0.85%)}	_{🟩-1.263s (-14.30%)}	_7.452s	_7.707s	_{p=0.000 n=12}
_{Emit Time}	_{0.433s (± 4.75%)}	_{0.439s (± 6.78%)}	_{+0.006s (+ 1.39%)}	_0.420s	_0.588s	_{p=0.005 n=12}
_{Total Time}	_{10.536s (± 0.35%)}	_{9.306s (± 0.65%)}	_{🟩-1.230s (-11.67%)}	_9.187s	_9.446s	_{p=0.000 n=12}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,388,669	_1,185,704	_{🟩-202,965 (-14.62%)}	_~	_~	_{p=0.000 n=12}
_Types	_441,862	_441,862	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,617,388k (± 0.73%)}	_{1,571,538k (± 1.02%)}	_{-45,850k (- 2.83%)}	_1,542,202k	_1,608,277k	_{p=0.000 n=12}
_{Memory Allocs}	_{92,184,990 (± 0.12%)}	_{91,759,752 (± 0.20%)}	_{-425,239 (- 0.46%)}	_91,238,746	_92,104,790	_{p=0.000 n=12}
_{Config Time}	_{0.003s (±16.75%)}	_{0.004s (± 6.39%)}	_~	_0.003s	_0.004s	_{p=0.155 n=12}
_{Parse Time}	_{0.192s (± 3.40%)}	_{0.198s (± 3.41%)}	_~	_0.182s	_0.218s	_{p=0.213 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{1.813s (± 0.50%)}	_{1.751s (± 0.79%)}	_{🟩-0.062s (- 3.42%)}	_1.716s	_1.782s	_{p=0.000 n=12}
_{Emit Time}	_{0.305s (± 3.18%)}	_{0.324s (± 4.62%)}	_{🔻+0.019s (+ 6.25%)}	_0.284s	_0.358s	_{p=0.050 n=12}
_{Total Time}	_{23.437s (± 0.74%)}	_{23.136s (± 0.73%)}	_{-0.301s (- 1.28%)}	_22.775s	_23.550s	_{p=0.012 n=12}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_334,953	_263,776	_{🟩-71,177 (-21.25%)}	_~	_~	_{p=0.000 n=12}
_Types	_197,616	_197,616	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{296,080k (± 0.03%)}	_{282,771k (± 0.03%)}	_{🟩-13,309k (- 4.50%)}	_282,551k	_282,966k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,621,702 (± 0.01%)}	_{4,601,916 (± 0.01%)}	_{-19,786 (- 0.43%)}	_4,601,005	_4,602,962	_{p=0.000 n=12}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.112s (± 5.89%)}	_{0.116s (± 2.89%)}	_~	_0.108s	_0.123s	_{p=0.325 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{1.039s (± 0.53%)}	_{1.015s (± 0.47%)}	_{-0.024s (- 2.31%)}	_1.005s	_1.031s	_{p=0.000 n=12}
_{Emit Time}	_{0.152s (± 4.43%)}	_{0.147s (± 6.40%)}	_~	_0.123s	_0.173s	_{p=0.504 n=12}
_{Total Time}	_{1.356s (± 0.56%)}	_{1.332s (± 1.03%)}	_{-0.024s (- 1.78%)}	_1.295s	_1.362s	_{p=0.006 n=12}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_303,834	_231,913	_{🟩-71,921 (-23.67%)}	_~	_~	_{p=0.000 n=12}
_Types	_181,663	_181,663	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{256,648k (± 0.01%)}	_{242,659k (± 0.02%)}	_{🟩-13,989k (- 5.45%)}	_242,495k	_242,718k	_{p=0.000 n=12}
_{Memory Allocs}	_{1,613,811 (± 0.01%)}	_{1,590,168 (± 0.01%)}	_{-23,643 (- 1.47%)}	_1,589,496	_1,590,619	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.098s (± 5.17%)}	_{0.098s (± 4.38%)}	_~	_0.085s	_0.107s	_{p=0.831 n=12}
_{Bind Time}	_{0.041s (±11.89%)}	_{0.038s (±12.90%)}	_~	_0.027s	_0.053s	_{p=0.368 n=12}
_{Check Time}	_{0.812s (± 0.71%)}	_{0.788s (± 0.61%)}	_{-0.024s (- 2.97%)}	_0.777s	_0.799s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.966s (± 0.88%)}	_{0.938s (± 0.71%)}	_{-0.028s (- 2.91%)}	_0.916s	_0.950s	_{p=0.000 n=12}
_{vscode - native}
_Errors	₃₉₆	₃₉₆	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_11,300,551	_6,026,058	_{🟩-5,274,493 (-46.67%)}	_~	_~	_{p=0.000 n=12}
_Types	_3,725,313	_3,725,313	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{6,453,141k (± 0.01%)}	_{5,577,199k (± 0.02%)}	_{🟩-875,942k (-13.57%)}	_5,574,796k	_5,579,493k	_{p=0.000 n=12}
_{Memory Allocs}	_{55,473,274 (± 0.03%)}	_{54,494,667 (± 0.02%)}	_{-978,608 (- 1.76%)}	_54,480,323	_54,534,515	_{p=0.000 n=12}
_{Config Time}	_{0.075s (± 0.43%)}	_{0.075s (± 0.33%)}	_~	_0.075s	_0.076s	_{p=0.371 n=12}
_{Parse Time}	_{1.833s (± 3.73%)}	_{1.852s (± 3.10%)}	_~	_1.697s	_1.971s	_{p=0.504 n=12}
_{Bind Time}	_{0.669s (±18.45%)}	_{0.569s (±19.61%)}	_~	_0.447s	_0.925s	_{p=0.340 n=12}
_{Check Time}	_{13.662s (± 0.95%)}	_{12.578s (± 0.92%)}	_{🟩-1.084s (- 7.93%)}	_12.291s	_12.784s	_{p=0.000 n=12}
_{Emit Time}	_{5.456s (± 8.70%)}	_{4.857s (± 7.64%)}	_~	_4.267s	_6.057s	_{p=0.066 n=12}
_{Total Time}	_{21.787s (± 1.87%)}	_{20.018s (± 1.63%)}	_{🟩-1.768s (- 8.12%)}	_19.398s	_20.952s	_{p=0.000 n=12}
_{webpack - native}
_Errors	₅₈₅	₅₈₅	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,304,467	_908,614	_{🟩-395,853 (-30.35%)}	_~	_~	_{p=0.000 n=12}
_Types	_608,716	_608,716	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{933,527k (± 0.02%)}	_{832,490k (± 0.02%)}	_{🟩-101,037k (-10.82%)}	_832,126k	_832,863k	_{p=0.000 n=12}
_{Memory Allocs}	_{6,622,596 (± 0.01%)}	_{6,456,801 (± 0.05%)}	_{-165,795 (- 2.50%)}	_6,453,092	_6,470,369	_{p=0.000 n=12}
_{Config Time}	_0.009s	_0.009s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.300s (± 2.67%)}	_{0.306s (± 3.18%)}	_~	_0.282s	_0.334s	_{p=0.370 n=12}
_{Bind Time}	_{0.089s (±18.04%)}	_{0.083s (±19.43%)}	_~	_0.066s	_0.135s	_{p=0.702 n=12}
_{Check Time}	_{2.123s (± 0.72%)}	_{1.884s (± 0.81%)}	_{🟩-0.238s (-11.23%)}	_1.849s	_1.917s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{2.557s (± 0.37%)}	_{2.318s (± 0.33%)}	_{🟩-0.239s (- 9.34%)}	_2.295s	_2.339s	_{p=0.000 n=12}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,062,854	_642,120	_{🟩-420,734 (-39.59%)}	_~	_~	_{p=0.000 n=12}
_Types	_391,024	_391,024	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{548,207k (± 0.03%)}	_{467,289k (± 0.02%)}	_{🟩-80,919k (-14.76%)}	_466,998k	_467,509k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,895,101 (± 0.11%)}	_{4,758,161 (± 0.08%)}	_{-136,940 (- 2.80%)}	_4,748,617	_4,767,343	_{p=0.000 n=12}
_{Config Time}	_0.003s	_0.003s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.146s (± 3.34%)}	_{0.147s (± 3.55%)}	_~	_0.135s	_0.167s	_{p=0.876 n=12}
_{Bind Time}	_{0.043s (±21.07%)}	_{0.051s (±17.71%)}	_~	_0.034s	_0.075s	_{p=0.061 n=12}
_{Check Time}	_{1.024s (± 0.73%)}	_{0.903s (± 1.05%)}	_{🟩-0.121s (-11.86%)}	_0.882s	_0.938s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.224s (± 0.78%)}	_{1.115s (± 1.19%)}	_{🟩-0.109s (- 8.94%)}	_1.087s	_1.159s	_{p=0.000 n=12}

System info unknown

Hosts

native

Scenarios

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

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

Developer Information:

Download Benchmarks

typescript-automation · 2026-10-13T09:43:20Z

Jake Bailey (@jakebailey) Here are the results of running the user tests with tsc comparing baseline and pr:

Everything looks good!

typescript-automation · 2026-10-13T10:30:38Z

Jake Bailey (@jakebailey) Here are the results of running the top 400 repos with tsc comparing baseline and pr:

Everything looks good!

Review feedback was that the member layout code is hard to read. Member origins were encoded with negative sentinels in the base and slot fields, the sort ranks were bare numbers, and callers that wanted property names and flags without resolving members had to juggle a pair of return values whose meaning depended on each other. Give member origins an explicit kind, name the sort ranks, and replace the shapes-and-lazy-members pair with getPropertyShapesOfType and getPropertyOfTypeAt, which work the same for every type. The compact layout representation is kept: a map index and per-member keys cost about 4% more memory on VS Code, since every interface layout includes all of its inherited members. │ before │ after │ │ heap-B/op │ heap-B/op vs base │ vscode 3.539Gi ± ∞ 3.548Gi ± ∞ +0.25% (p=0.029 n=4) mui 2.164Gi ± ∞ 2.169Gi ± ∞ +0.23% (p=0.029 n=4) │ before │ after │ │ allocs/op │ allocs/op vs base │ vscode 36.24M ± ∞ 36.26M ± ∞ ~ (p=0.886 n=4) mui 32.13M ± ∞ 32.18M ± ∞ ~ (p=0.686 n=4)

# Conflicts: # tsc/internal/checker/checker.go # tsc/internal/checker/nodebuilderimpl.go # tsc/internal/checker/relater.go # tsc/internal/checker/types.go

Lazily resolved members add one pointer to every structured type.

Jake Bailey (jakebailey) · 2026-10-14T17:51:04Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-10-14T17:51:10Z

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

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

typescript-automation · 2026-10-14T18:24:19Z

Jake Bailey (@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 - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_115,276	_88,498	_{🟩-26,778 (-23.23%)}	_~	_~	_{p=0.000 n=12}
_Types	_79,613	_79,613	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{113,507k (± 0.08%)}	_{108,651k (± 0.04%)}	_{🟩-4,856k (- 4.28%)}	_108,571k	_108,787k	_{p=0.000 n=12}
_{Memory Allocs}	_{2,212,436 (± 0.01%)}	_{2,200,147 (± 0.00%)}	_{-12,290 (- 0.56%)}	_2,199,917	_2,200,350	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.039s (± 4.97%)}	_{0.040s (± 2.57%)}	_~	_0.038s	_0.043s	_{p=0.518 n=12}
_{Bind Time}	_{0.014s (±11.99%)}	_{0.014s (±10.07%)}	_~	_0.011s	_0.018s	_{p=0.895 n=12}
_{Check Time}	_{0.467s (± 0.81%)}	_{0.470s (± 0.88%)}	_~	_0.463s	_0.487s	_{p=0.270 n=12}
_{Emit Time}	_{0.270s (± 1.68%)}	_{0.265s (± 2.37%)}	_~	_0.249s	_0.281s	_{p=0.296 n=12}
_{Total Time}	_{0.798s (± 0.64%)}	_{0.796s (± 1.20%)}	_~	_0.779s	_0.828s	_{p=0.523 n=12}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_{847,281 (± 0.08%)}	_{586,954 (± 0.02%)}	_{🟩-260,327 (-30.73%)}	_586,509	_587,280	_{p=0.000 n=12}
_Types	_{247,032 (± 0.00%)}	_{247,040 (± 0.00%)}	_{+8 (+ 0.00%)}	_247,037	_247,042	_{p=0.000 n=12}
_{Memory Used}	_{596,488k (± 0.04%)}	_{548,229k (± 0.03%)}	_{🟩-48,258k (- 8.09%)}	_547,641k	_548,591k	_{p=0.000 n=12}
_{Memory Allocs}	_{13,140,105 (± 0.02%)}	_{13,056,539 (± 0.05%)}	_{-83,566 (- 0.64%)}	_13,048,847	_13,091,025	_{p=0.000 n=12}
_{Config Time}	_{0.016s (± 1.90%)}	_{0.017s (± 1.99%)}	_~	_0.016s	_0.017s	_{p=0.680 n=12}
_{Parse Time}	_{0.218s (± 1.78%)}	_{0.218s (± 1.80%)}	_~	_0.210s	_0.235s	_{p=0.765 n=12}
_{Bind Time}	_{0.087s (±14.18%)}	_{0.092s (± 9.29%)}	_~	_0.063s	_0.113s	_{p=0.766 n=12}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=12}
_{Emit Time}	_{1.542s (± 1.82%)}	_{1.507s (± 0.80%)}	_~	_1.489s	_1.555s	_{p=0.089 n=12}
_{Total Time}	_{1.882s (± 1.72%)}	_{1.858s (± 0.61%)}	_~	_1.840s	_1.904s	_{p=0.097 n=12}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,331,835	_3,829,690	_{🟩-502,145 (-11.59%)}	_~	_~	_{p=0.000 n=12}
_Types	_1,370,520	_1,370,520	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,625,592k (± 0.05%)}	_{2,141,852k (± 0.08%)}	_{🟩-483,740k (-18.42%)}	_2,138,254k	_2,149,088k	_{p=0.000 n=12}
_{Memory Allocs}	_{27,715,426 (± 0.09%)}	_{27,141,415 (± 0.05%)}	_{-574,011 (- 2.07%)}	_27,113,857	_27,174,144	_{p=0.000 n=12}
_{Config Time}	_{0.017s (± 1.95%)}	_{0.017s (± 1.07%)}	_~	_0.016s	_0.017s	_{p=0.155 n=12}
_{Parse Time}	_{0.479s (± 3.51%)}	_{0.475s (± 1.80%)}	_~	_0.453s	_0.493s	_{p=0.486 n=12}
_{Bind Time}	_0.002s	_{0.002s (± 9.47%)}	_~	_0.001s	_0.002s	_{p=1.000 n=12}
_{Check Time}	_{7.244s (± 0.53%)}	_{6.310s (± 0.50%)}	_{🟩-0.934s (-12.90%)}	_6.272s	_6.451s	_{p=0.000 n=12}
_{Emit Time}	_{0.497s (±13.50%)}	_{0.472s (± 1.97%)}	_~	_0.425s	_0.479s	_{p=0.213 n=12}
_{Total Time}	_{8.950s (± 1.06%)}	_{8.034s (± 0.29%)}	_{🟩-0.915s (-10.23%)}	_8.001s	_8.115s	_{p=0.000 n=12}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,388,669	_1,185,704	_{🟩-202,965 (-14.62%)}	_~	_~	_{p=0.000 n=12}
_Types	_441,862	_441,862	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,304,868k (± 0.53%)}	_{1,267,986k (± 0.46%)}	_{-36,882k (- 2.83%)}	_1,256,329k	_1,286,225k	_{p=0.000 n=12}
_{Memory Allocs}	_{78,228,115 (± 0.09%)}	_{77,805,619 (± 0.05%)}	_{-422,497 (- 0.54%)}	_77,671,642	_77,866,947	_{p=0.000 n=12}
_{Config Time}	_{0.004s (±12.12%)}	_{0.003s (±16.58%)}	_~	_0.002s	_0.005s	_{p=0.880 n=12}
_{Parse Time}	_{0.258s (± 2.70%)}	_{0.253s (± 1.93%)}	_~	_0.240s	_0.263s	_{p=0.369 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{1.673s (± 0.40%)}	_{1.624s (± 0.62%)}	_{-0.049s (- 2.93%)}	_1.596s	_1.649s	_{p=0.000 n=12}
_{Emit Time}	_{0.304s (± 3.21%)}	_{0.315s (± 4.09%)}	_~	_0.289s	_0.344s	_{p=0.147 n=12}
_{Total Time}	_{19.959s (± 0.58%)}	_{19.672s (± 0.74%)}	_{-0.287s (- 1.44%)}	_19.174s	_20.096s	_{p=0.002 n=12}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_334,953	_263,776	_{🟩-71,177 (-21.25%)}	_~	_~	_{p=0.000 n=12}
_Types	_197,616	_197,616	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{247,557k (± 0.03%)}	_{235,953k (± 0.03%)}	_{🟩-11,603k (- 4.69%)}	_235,708k	_236,095k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,329,752 (± 0.01%)}	_{4,303,535 (± 0.02%)}	_{-26,216 (- 0.61%)}	_4,302,173	_4,307,377	_{p=0.000 n=12}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.110s (± 4.33%)}	_{0.109s (± 5.11%)}	_~	_0.098s	_0.131s	_{p=0.765 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{0.965s (± 0.57%)}	_{0.944s (± 0.44%)}	_{-0.021s (- 2.17%)}	_0.935s	_0.958s	_{p=0.000 n=12}
_{Emit Time}	_{0.144s (± 3.27%)}	_{0.149s (± 3.46%)}	_~	_0.137s	_0.168s	_{p=0.202 n=12}
_{Total Time}	_{1.271s (± 0.84%)}	_{1.257s (± 0.62%)}	_{-0.014s (- 1.11%)}	_1.239s	_1.277s	_{p=0.040 n=12}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_303,834	_231,913	_{🟩-71,921 (-23.67%)}	_~	_~	_{p=0.000 n=12}
_Types	_181,663	_181,663	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{215,233k (± 0.02%)}	_{203,052k (± 0.02%)}	_{🟩-12,181k (- 5.66%)}	_202,948k	_203,164k	_{p=0.000 n=12}
_{Memory Allocs}	_{1,401,434 (± 0.01%)}	_{1,370,663 (± 0.01%)}	_{-30,772 (- 2.20%)}	_1,370,219	_1,371,318	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.096s (± 4.61%)}	_{0.098s (± 3.98%)}	_~	_0.091s	_0.109s	_{p=0.384 n=12}
_{Bind Time}	_{0.044s (± 7.85%)}	_{0.040s (± 8.35%)}	_~	_0.031s	_0.052s	_{p=0.145 n=12}
_{Check Time}	_{0.744s (± 0.81%)}	_{0.731s (± 0.77%)}	_{-0.013s (- 1.78%)}	_0.713s	_0.746s	_{p=0.002 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.900s (± 0.61%)}	_{0.884s (± 0.52%)}	_{-0.016s (- 1.73%)}	_0.874s	_0.894s	_{p=0.000 n=12}
_{vscode - native}
_Errors	₃₉₆	₃₉₆	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_11,687,338	_6,235,243	_{🟩-5,452,095 (-46.65%)}	_~	_~	_{p=0.000 n=12}
_Types	_3,851,240	_3,851,240	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{5,513,775k (± 0.01%)}	_{4,717,391k (± 0.03%)}	_{🟩-796,384k (-14.44%)}	_4,714,978k	_4,724,860k	_{p=0.000 n=12}
_{Memory Allocs}	_{56,191,133 (± 0.01%)}	_{54,614,669 (± 0.03%)}	_{-1,576,465 (- 2.81%)}	_54,602,212	_54,695,782	_{p=0.000 n=12}
_{Config Time}	_{0.075s (± 0.38%)}	_{0.075s (± 0.24%)}	_~	_0.074s	_0.075s	_{p=0.590 n=12}
_{Parse Time}	_{1.729s (± 2.55%)}	_{1.760s (± 2.15%)}	_~	_1.667s	_1.865s	_{p=0.242 n=12}
_{Bind Time}	_{0.654s (±15.44%)}	_{0.589s (±13.01%)}	_~	_0.475s	_0.816s	_{p=0.340 n=12}
_{Check Time}	_{13.365s (± 1.05%)}	_{12.295s (± 0.74%)}	_{🟩-1.070s (- 8.01%)}	_11.983s	_12.434s	_{p=0.000 n=12}
_{Emit Time}	_{4.981s (± 8.25%)}	_{4.917s (± 8.52%)}	_~	_4.277s	_5.907s	_{p=0.964 n=12}
_{Total Time}	_{20.887s (± 1.67%)}	_{19.721s (± 2.14%)}	_{🟩-1.167s (- 5.59%)}	_19.134s	_20.706s	_{p=0.002 n=12}
_{webpack - native}
_Errors	₅₈₄	₅₈₄	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,299,351	_896,823	_{🟩-402,528 (-30.98%)}	_~	_~	_{p=0.000 n=12}
_Types	_598,360	_598,360	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{789,587k (± 0.02%)}	_{691,776k (± 0.02%)}	_{🟩-97,811k (-12.39%)}	_691,375k	_692,215k	_{p=0.000 n=12}
_{Memory Allocs}	_{6,052,601 (± 0.02%)}	_{5,840,840 (± 0.02%)}	_{🟩-211,761 (- 3.50%)}	_5,838,113	_5,844,082	_{p=0.000 n=12}
_{Config Time}	_0.009s	_0.009s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.294s (± 3.03%)}	_{0.292s (± 2.86%)}	_~	_0.273s	_0.310s	_{p=0.660 n=12}
_{Bind Time}	_{0.076s (± 5.23%)}	_{0.079s (±13.61%)}	_~	_0.066s	_0.121s	_{p=0.579 n=12}
_{Check Time}	_{1.949s (± 0.87%)}	_{1.758s (± 0.90%)}	_{🟩-0.191s (- 9.81%)}	_1.712s	_1.791s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{2.366s (± 0.59%)}	_{2.175s (± 0.65%)}	_{🟩-0.192s (- 8.10%)}	_2.138s	_2.208s	_{p=0.000 n=12}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,062,854	_642,120	_{🟩-420,734 (-39.59%)}	_~	_~	_{p=0.000 n=12}
_Types	_390,845	_390,845	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{472,269k (± 0.02%)}	_{400,017k (± 0.03%)}	_{🟩-72,252k (-15.30%)}	_399,799k	_400,453k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,225,745 (± 0.10%)}	_{4,047,372 (± 0.12%)}	_{🟩-178,373 (- 4.22%)}	_4,036,561	_4,059,700	_{p=0.000 n=12}
_{Config Time}	_0.003s	_0.003s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.135s (± 3.72%)}	_{0.138s (± 3.73%)}	_~	_0.124s	_0.150s	_{p=0.247 n=12}
_{Bind Time}	_{0.050s (±17.17%)}	_{0.044s (±15.06%)}	_~	_0.035s	_0.066s	_{p=0.383 n=12}
_{Check Time}	_{1.004s (± 0.83%)}	_{0.869s (± 0.50%)}	_{🟩-0.135s (-13.45%)}	_0.859s	_0.884s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.200s (± 0.96%)}	_{1.061s (± 0.69%)}	_{🟩-0.139s (-11.61%)}	_1.042s	_1.080s	_{p=0.000 n=12}

System info unknown

Hosts

native

Scenarios

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

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

Developer Information:

Download Benchmarks

Copilot

🟡 Changes recommended

Module cloning can lose properties, and cached inherited slots can become invalid after instantiation-limit fallback.

3 open findings

🧠 Review effort: Balanced

Namespace imports of a callable export= value whose members are resolved lazily lose every property, so ns.value reports a missing property. This test captures the current, incorrect output.

Members resolved through a shared layout leave the members table nil until it is requested, so reading the field directly cloned an empty table for namespace imports of callable export= values.

Members of class and interface instantiations are now resolved one at a time through shared layouts, so a lookup of a single inherited member can happen before the full member list is built. Cover lookups through layout and non-layout bases, followed by enumeration, to check that the members and their order match eager resolution.

When a base type's own base fails to instantiate, the base gets a smaller layout of its own, but the derived type still reuses slot indices from the shared layout. The derived type then reports the wrong members. This test captures the current, incorrect output.

A shared layout addresses inherited members by their slots in each base's shared layout. Checking only for error bases missed a base whose own base hit the instantiation limit: that base gets a smaller layout, so the derived type's slots pointed at the wrong members or past the end of the base's members.

Copilot

🔵 Needs a closer look

The core caching refactor has an unresolved layout-compatibility issue and requires human review and full-suite validation.

2 open findings

2 resolved since last review

🧠 Review effort: Balanced

Instantiations of a variadic tuple base can have different tuple targets, and so different member layouts. The derived interface still reuses the layout built for its first instantiation, so it loses the added tuple elements. This test captures the current, incorrect output.

Inherited member slots index into the base's layout, so a shared layout is only valid for instantiations whose bases resolve to the exact base layouts it was built from. Instantiations of a variadic tuple base produce different tuple targets with distinct layouts, so reusing the cached layout read members from the wrong slots.

Copilot

🔵 Needs a closer look

The core member-resolution and inheritance-cache rewrite warrants human review backed by full compiler and language-server validation.

0 open findings

2 resolved since last review

🧠 Review effort: Balanced

An intersection base without type parameters can still reference the polymorphic this type, so its members can differ between instantiations of the derived type. Shared member layouts assumed otherwise and crash looking up a member that no longer exists.

A computed member name that reads a member of its own class or interface resolves the type's members while its late-bound members are still being bound. The layout built from that partial member table must not be reused once the late-bound members are known.

Finding inherited members by name relied on bases without type parameters having the same members in every instantiation, which doesn't hold when a base references the polymorphic this type. A layout is now shared only when each base's members are known to be fixed: the base is any or has a shared layout itself.

Late binding a member name can resolve its own type's members before the late-bound members are known, and the shared layout built then was reused for every later instantiation. Dropping it when the declared members are replaced lets the next instantiation build a layout with the complete members.

Each review of member layouts has found another way a shared layout can disagree with the members its type would otherwise have. Checking every lazily resolved class and interface type against members resolved as before layouts finds such disagreements across whole test suites and real projects, rather than one case at a time. The check is enabled for now so that test runs over user and top repositories can report mismatches.

Jake Bailey (jakebailey) · 2026-10-14T22:21:03Z

TypeScript Bot (@typescript-bot) user test this
TypeScript Bot (@typescript-bot) test top1000

typescript-automation · 2026-10-14T22:21:07Z

Hey Jake Bailey (@jakebailey), this PR is in an unmergable state, so is missing a merge commit to run against; please resolve conflicts and try again.

Jake Bailey (jakebailey) · 2026-10-14T22:37:36Z

TypeScript Bot (@typescript-bot) user test this
TypeScript Bot (@typescript-bot) test top1000

typescript-automation · 2026-10-14T22:37:41Z

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

Command	Status	Results
`user test this`	✅ Started	✅ Results
`test top1000`	✅ Started	✅ Results

typescript-automation · 2026-10-14T23:06:03Z

Jake Bailey (@jakebailey) Here are the results of running the user tests with tsc comparing baseline and pr:

Everything looks good!

typescript-automation · 2026-10-15T00:48:38Z

Jake Bailey (@jakebailey) Here are the results of running the top 1000 repos with tsc comparing baseline and pr:

Everything looks good!

Copilot AI balanced review requested due to automatic review settings October 13, 2026 07:41

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typescript-automation Bot added Author: Team For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Oct 13, 2026

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Copilot started reviewing on behalf of Jake Bailey (jakebailey) October 13, 2026 07:42

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Comment thread tsc/internal/checker/checker.go

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Boshen (Boshen) mentioned this pull request Oct 13, 2026

checker: port shared class and interface member layouts maschwenk/tsrs#371

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Jake Bailey (jakebailey) mentioned this pull request Oct 13, 2026

Resolve instantiated object members through a shared worker #64735

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Jake Bailey (jakebailey) added 3 commits October 13, 2026 11:14

Merge remote-tracking branch 'upstream/main' into shared-member-layouts

3b7f539

# Conflicts: # tsc/internal/checker/checker.go # tsc/internal/checker/nodebuilderimpl.go # tsc/internal/checker/relater.go # tsc/internal/checker/types.go

Account for lazy members in the structured type size check

a87c1dc

Lazily resolved members add one pointer to every structured type.

Jake Bailey (jakebailey) requested a balanced review from Copilot October 14, 2026 18:47

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Comment thread tsc/internal/checker/checker.go

Jake Bailey (jakebailey) added 5 commits October 14, 2026 12:59

Add test for namespace imports of callable export= values

281ff13

Namespace imports of a callable export= value whose members are resolved lazily lose every property, so ns.value reports a missing property. This test captures the current, incorrect output.

Materialize lazy members when cloning a module type

32efca3

Members resolved through a shared layout leave the members table nil until it is requested, so reading the field directly cloned an empty table for namespace imports of callable export= values.

Jake Bailey (jakebailey) requested a balanced review from Copilot October 14, 2026 20:04

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Jake Bailey (jakebailey) added 2 commits October 14, 2026 14:02

Jake Bailey (jakebailey) requested a balanced review from Copilot October 14, 2026 21:15

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Jake Bailey (jakebailey) added 4 commits October 14, 2026 15:07

Jake Bailey (jakebailey) marked this pull request as draft October 14, 2026 22:16

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tsc

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Jake Bailey (jakebailey) commented Oct 14, 2026

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Jake Bailey (jakebailey) commented Oct 13, 2026 •

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typescript-automation Bot commented Oct 14, 2026 •

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