Don't resolve mapped type members to find their signatures by jakebailey · Pull Request #64873 · microsoft/TypeScript

Jake Bailey (jakebailey) · 2026-10-19T17:47:42Z

Mapped types never have call or construct signatures, but asking for their signatures resolved all of their properties. Signature checks in relations ask for them first, so every mapped type that reached a relation had its properties built, even when nothing else needed them. In MUI, components accept Partial<...> of each intrinsic element's props, so this built hundreds of properties for each of thousands of such types, and their combined base properties too.

Measured with --checkers 4 (n=6):

                      │  old.txt   │             new.txt              │
                      │   sec/op   │   sec/op    vs base              │
    Tsc/bluesky         2.459 ± 3%   2.458 ± 3%       ~ (p=0.818 n=6)
    Tsc/sentry          10.21 ± 4%   10.27 ± 3%       ~ (p=0.937 n=6)
    Tsc/t3code-server   8.097 ± 3%   8.085 ± 1%       ~ (p=0.937 n=6)
    Tsc/mui-docs        6.423 ± 4%   5.902 ± 4%  -8.10% (p=0.002 n=6)
    geomean             6.011        5.892       -1.98%

                      │   old.txt    │              new.txt               │
                      │    rss-B     │    rss-B      vs base              │
    Tsc/bluesky         1.184Gi ± 1%   1.176Gi ± 3%       ~ (p=0.699 n=6)
    Tsc/sentry          3.415Gi ± 5%   3.273Gi ± 5%       ~ (p=0.240 n=6)
    Tsc/t3code-server   2.875Gi ± 6%   2.913Gi ± 8%       ~ (p=0.699 n=6)
    Tsc/mui-docs        2.323Gi ± 7%   2.203Gi ± 5%       ~ (p=0.240 n=6)
    geomean             2.280Gi        2.229Gi       -2.21%

                      │   old.txt    │              new.txt               │
                      │    heap-B    │    heap-B     vs base              │
    Tsc/bluesky         915.1Mi ± 0%   914.7Mi ± 0%       ~ (p=0.132 n=6)
    Tsc/sentry          2.483Gi ± 0%   2.481Gi ± 0%       ~ (p=0.065 n=6)
    Tsc/t3code-server   2.179Gi ± 0%   2.179Gi ± 0%       ~ (p=0.589 n=6)
    Tsc/mui-docs        1.722Gi ± 0%   1.634Gi ± 0%  -5.16% (p=0.002 n=6)
    geomean             1.699Gi        1.676Gi       -1.35%

vscode is unaffected (n=12):

               │    old     │             new              │
               │   sec/op   │   sec/op    vs base          │
    Tsc/vscode   11.71 ± 1%   11.67 ± 2%  ~ (p=0.899 n=12)

               │     old      │              new               │
               │    rss-B     │    rss-B      vs base          │
    Tsc/vscode   4.765Gi ± 1%   4.787Gi ± 1%  ~ (p=0.443 n=12)

               │     old      │              new               │
               │    heap-B    │    heap-B     vs base          │
    Tsc/vscode   3.977Gi ± 0%   3.976Gi ± 0%  ~ (p=1.000 n=12)

Mapped types never have call or construct signatures, but asking for their signatures resolved all of their properties. Signature checks in relations ask for them first, so every mapped type that reached a relation had its properties built, even when nothing else needed them. In MUI, components accept Partial<...> of each intrinsic element's props, so this built hundreds of properties for each of thousands of such types, and their combined base properties too. Measured with --checkers 4 (n=6): │ old.txt │ new.txt │ │ sec/op │ sec/op vs base │ Tsc/bluesky 2.459 ± 3% 2.458 ± 3% ~ (p=0.818 n=6) Tsc/sentry 10.21 ± 4% 10.27 ± 3% ~ (p=0.937 n=6) Tsc/t3code-server 8.097 ± 3% 8.085 ± 1% ~ (p=0.937 n=6) Tsc/mui-docs 6.423 ± 4% 5.902 ± 4% -8.10% (p=0.002 n=6) geomean 6.011 5.892 -1.98% │ old.txt │ new.txt │ │ rss-B │ rss-B vs base │ Tsc/bluesky 1.184Gi ± 1% 1.176Gi ± 3% ~ (p=0.699 n=6) Tsc/sentry 3.415Gi ± 5% 3.273Gi ± 5% ~ (p=0.240 n=6) Tsc/t3code-server 2.875Gi ± 6% 2.913Gi ± 8% ~ (p=0.699 n=6) Tsc/mui-docs 2.323Gi ± 7% 2.203Gi ± 5% ~ (p=0.240 n=6) geomean 2.280Gi 2.229Gi -2.21% │ old.txt │ new.txt │ │ heap-B │ heap-B vs base │ Tsc/bluesky 915.1Mi ± 0% 914.7Mi ± 0% ~ (p=0.132 n=6) Tsc/sentry 2.483Gi ± 0% 2.481Gi ± 0% ~ (p=0.065 n=6) Tsc/t3code-server 2.179Gi ± 0% 2.179Gi ± 0% ~ (p=0.589 n=6) Tsc/mui-docs 1.722Gi ± 0% 1.634Gi ± 0% -5.16% (p=0.002 n=6) geomean 1.699Gi 1.676Gi -1.35% vscode is unaffected (n=12): │ old │ new │ │ sec/op │ sec/op vs base │ Tsc/vscode 11.71 ± 1% 11.67 ± 2% ~ (p=0.899 n=12) │ old │ new │ │ rss-B │ rss-B vs base │ Tsc/vscode 4.765Gi ± 1% 4.787Gi ± 1% ~ (p=0.443 n=12) │ old │ new │ │ heap-B │ heap-B vs base │ Tsc/vscode 3.977Gi ± 0% 3.976Gi ± 0% ~ (p=1.000 n=12)

Jake Bailey (jakebailey) · 2026-10-19T17:47:54Z

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

typescript-automation · 2026-10-19T17:48:00Z

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

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

Copilot

🟢 Approval recommended

The narrow guard preserves signature results and deferred property resolution, with only a nonblocking regression-test suggestion.

1 open issue

Add regression test for lazy mapped type member resolution · New

What changed in this PR

Avoids resolving mapped-type properties when the native TypeScript checker only needs call or construct signatures.

Changes:

Returns empty signatures for unresolved mapped types.
Adds a guard matching the existing member-resolution dispatch.

File	Description
tsc/internal/checker/checker.go	Skips unnecessary mapped-type member resolution during signature queries.

_{Review effort: Balanced}


 func (c *Checker) getSignaturesOfStructuredType(t *Type, kind SignatureKind) []*Signature {
-	if t.flags&TypeFlagsStructuredType == 0 {
+	if t.flags&TypeFlagsStructuredType == 0 || isUnresolvedMappedType(t) {


typescript-automation · 2026-10-19T18:27:50Z

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	_115,276	_~	_~	_~	_{p=1.000 n=12}
_Types	_79,613	_79,613	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{113,562k (± 0.08%)}	_{113,574k (± 0.05%)}	_~	_113,440k	_113,703k	_{p=0.977 n=12}
_{Memory Allocs}	_{2,212,567 (± 0.01%)}	_{2,212,564 (± 0.00%)}	_~	_2,212,316	_2,212,832	_{p=0.977 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.048s (± 3.57%)}	_{0.049s (± 3.68%)}	_~	_0.044s	_0.054s	_{p=0.764 n=12}
_{Bind Time}	_{0.017s (± 6.81%)}	_{0.017s (±10.09%)}	_~	_0.014s	_0.021s	_{p=0.902 n=12}
_{Check Time}	_{0.567s (± 0.79%)}	_{0.559s (± 0.76%)}	_{-0.009s (- 1.57%)}	_0.549s	_0.567s	_{p=0.006 n=12}
_{Emit Time}	_{0.324s (± 2.76%)}	_{0.324s (± 2.10%)}	_~	_0.301s	_0.338s	_{p=0.898 n=12}
_{Total Time}	_{0.965s (± 0.83%)}	_{0.957s (± 0.61%)}	_{-0.008s (- 0.86%)}	_0.940s	_0.969s	_{p=0.049 n=12}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_{846,722 (± 0.10%)}	_{846,666 (± 0.07%)}	_~	_845,352	_848,581	_{p=0.843 n=12}
_Types	_{247,034 (± 0.00%)}	_{247,000 (± 0.00%)}	_{-33 (- 0.01%)}	_246,999	_247,001	_{p=0.000 n=12}
_{Memory Used}	_{596,272k (± 0.02%)}	_{596,333k (± 0.02%)}	_~	_595,963k	_596,596k	_{p=0.443 n=12}
_{Memory Allocs}	_{13,140,143 (± 0.03%)}	_{13,138,645 (± 0.02%)}	_~	_13,134,693	_13,146,627	_{p=0.514 n=12}
_{Config Time}	_{0.020s (± 0.90%)}	_0.020s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.276s (± 2.41%)}	_{0.276s (± 2.02%)}	_~	_0.264s	_0.290s	_{p=0.876 n=12}
_{Bind Time}	_{0.111s (±12.88%)}	_{0.108s (±12.64%)}	_~	_0.074s	_0.138s	_{p=0.701 n=12}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=12}
_{Emit Time}	_{1.851s (± 1.34%)}	_{1.851s (± 1.70%)}	_~	_1.758s	_1.941s	_{p=0.876 n=12}
_{Total Time}	_{2.278s (± 1.08%)}	_{2.278s (± 1.37%)}	_~	_2.165s	_2.358s	_{p=0.876 n=12}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,331,983	_4,248,807	_{-83,176 (- 1.92%)}	_~	_~	_{p=0.000 n=12}
_Types	_1,370,520	_1,356,171	_{-14,349 (- 1.05%)}	_~	_~	_{p=0.000 n=12}
_{Memory Used}	_{2,625,111k (± 0.07%)}	_{2,504,476k (± 0.05%)}	_{🟩-120,635k (- 4.60%)}	_2,500,350k	_2,508,434k	_{p=0.000 n=12}
_{Memory Allocs}	_{27,712,290 (± 0.16%)}	_{27,001,515 (± 0.06%)}	_{-710,775 (- 2.56%)}	_26,965,584	_27,048,722	_{p=0.000 n=12}
_{Config Time}	_{0.020s (± 1.21%)}	_{0.020s (± 1.40%)}	_~	_0.020s	_0.021s	_{p=1.000 n=12}
_{Parse Time}	_{0.572s (± 4.17%)}	_{0.578s (± 1.98%)}	_~	_0.543s	_0.604s	_{p=0.989 n=12}
_{Bind Time}	_{0.003s (±12.54%)}	_{0.002s (±13.14%)}	_~	_0.002s	_0.003s	_{p=1.000 n=12}
_{Check Time}	_{8.612s (± 0.36%)}	_{7.751s (± 0.48%)}	_{🟩-0.861s (-10.00%)}	_7.702s	_7.900s	_{p=0.000 n=12}
_{Emit Time}	_{0.701s (±11.12%)}	_{0.560s (± 3.27%)}	_{🟩-0.141s (-20.12%)}	_0.497s	_0.576s	_{p=0.011 n=12}
_{Total Time}	_{10.822s (± 0.77%)}	_{9.826s (± 0.13%)}	_{🟩-0.997s (- 9.21%)}	_9.795s	_9.856s	_{p=0.000 n=12}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,388,680	_1,388,668	_{-12 (- 0.00%)}	_~	_~	_{p=0.000 n=12}
_Types	_441,862	_441,862	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,309,498k (± 0.49%)}	_{1,313,069k (± 0.64%)}	_~	_1,298,825k	_1,341,227k	_{p=0.551 n=12}
_{Memory Allocs}	_{78,228,753 (± 0.09%)}	_{78,258,865 (± 0.10%)}	_~	_77,949,564	_78,427,082	_{p=0.378 n=12}
_{Config Time}	_{0.003s (±12.29%)}	_{0.004s (±10.43%)}	_~	_0.003s	_0.005s	_{p=0.215 n=12}
_{Parse Time}	_{0.249s (± 1.77%)}	_{0.253s (± 1.95%)}	_~	_0.237s	_0.263s	_{p=0.224 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{1.674s (± 0.41%)}	_{1.667s (± 0.39%)}	_~	_1.649s	_1.686s	_{p=0.086 n=12}
_{Emit Time}	_{0.297s (± 4.76%)}	_{0.304s (± 2.92%)}	_~	_0.281s	_0.332s	_{p=0.542 n=12}
_{Total Time}	_{19.723s (± 0.88%)}	_{19.841s (± 0.64%)}	_~	_19.532s	_20.244s	_{p=0.178 n=12}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_334,953	_334,941	_{-12 (- 0.00%)}	_~	_~	_{p=0.000 n=12}
_Types	_197,616	_197,616	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{247,462k (± 0.02%)}	_{247,520k (± 0.02%)}	_~	_247,336k	_247,608k	_{p=0.091 n=12}
_{Memory Allocs}	_{4,329,204 (± 0.01%)}	_{4,329,462 (± 0.01%)}	_~	_4,328,060	_4,330,519	_{p=0.410 n=12}
_{Config Time}	_{0.000s (±113.79%)}	_{0.001s (±55.53%)}	_~	_0.000s	_0.001s	_{p=0.214 n=12}
_{Parse Time}	_{0.094s (± 4.07%)}	_{0.091s (± 5.51%)}	_~	_0.078s	_0.104s	_{p=0.541 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{0.801s (± 0.65%)}	_{0.798s (± 0.66%)}	_~	_0.787s	_0.815s	_{p=0.417 n=12}
_{Emit Time}	_{0.122s (± 6.16%)}	_{0.120s (± 5.83%)}	_~	_0.102s	_0.133s	_{p=0.788 n=12}
_{Total Time}	_{1.062s (± 0.60%)}	_{1.055s (± 0.97%)}	_~	_1.023s	_1.082s	_{p=0.297 n=12}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_303,834	_303,815	_{-19 (- 0.01%)}	_~	_~	_{p=0.000 n=12}
_Types	_181,663	_181,663	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{215,259k (± 0.02%)}	_{215,228k (± 0.01%)}	_~	_215,089k	_215,274k	_{p=0.259 n=12}
_{Memory Allocs}	_{1,401,682 (± 0.01%)}	_{1,401,627 (± 0.02%)}	_~	_1,400,828	_1,402,141	_{p=0.887 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.080s (± 3.93%)}	_{0.077s (± 4.93%)}	_~	_0.068s	_0.085s	_{p=0.297 n=12}
_{Bind Time}	_{0.030s (± 9.76%)}	_{0.034s (±11.39%)}	_~	_0.024s	_0.044s	_{p=0.091 n=12}
_{Check Time}	_{0.625s (± 1.01%)}	_{0.619s (± 1.11%)}	_~	_0.603s	_0.644s	_{p=0.173 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.749s (± 0.75%)}	_{0.743s (± 0.86%)}	_{-0.006s (- 0.80%)}	_0.734s	_0.772s	_{p=0.029 n=12}
_{vscode - native}
_Errors	₃₉₆	₃₉₆	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_12,485,544	_12,485,523	_{-21 (- 0.00%)}	_~	_~	_{p=0.000 n=12}
_Types	_4,087,014	_4,086,995	_{-19 (- 0.00%)}	_~	_~	_{p=0.000 n=12}
_{Memory Used}	_{5,846,309k (± 0.03%)}	_{5,846,108k (± 0.02%)}	_~	_5,843,481k	_5,848,894k	_{p=0.843 n=12}
_{Memory Allocs}	_{59,404,397 (± 0.02%)}	_{59,387,756 (± 0.01%)}	_{-16,642 (- 0.03%)}	_59,378,508	_59,397,926	_{p=0.028 n=12}
_{Config Time}	_{0.076s (± 0.37%)}	_{0.076s (± 0.32%)}	_~	_0.076s	_0.077s	_{p=1.000 n=12}
_{Parse Time}	_{1.852s (± 2.32%)}	_{1.837s (± 2.49%)}	_~	_1.765s	_2.000s	_{p=0.514 n=12}
_{Bind Time}	_{0.632s (±12.07%)}	_{0.692s (±14.08%)}	_~	_0.514s	_0.956s	_{p=0.478 n=12}
_{Check Time}	_{15.910s (± 1.24%)}	_{15.768s (± 1.23%)}	_~	_15.452s	_16.198s	_{p=0.068 n=12}
_{Emit Time}	_{5.775s (± 6.24%)}	_{5.661s (± 6.38%)}	_~	_4.752s	_6.541s	_{p=0.755 n=12}
_{Total Time}	_{24.336s (± 1.10%)}	_{24.126s (± 1.09%)}	_~	_23.321s	_24.793s	_{p=0.242 n=12}
_{webpack - native}
_Errors	₅₉₈	₅₉₈	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,398,302	_1,398,302	_~	_~	_~	_{p=1.000 n=12}
_Types	_670,900	_670,882	_{-18 (- 0.00%)}	_~	_~	_{p=0.000 n=12}
_{Memory Used}	_{885,696k (± 0.02%)}	_{885,701k (± 0.02%)}	_~	_885,293k	_886,303k	_{p=0.887 n=12}
_{Memory Allocs}	_{6,927,301 (± 0.02%)}	_{6,926,881 (± 0.01%)}	_~	_6,924,812	_6,928,620	_{p=0.755 n=12}
_{Config Time}	_{0.007s (± 4.37%)}	_{0.008s (± 4.38%)}	_~	_0.007s	_0.008s	_{p=1.000 n=12}
_{Parse Time}	_{0.246s (± 2.57%)}	_{0.253s (± 3.01%)}	_~	_0.226s	_0.270s	_{p=0.075 n=12}
_{Bind Time}	_{0.060s (± 7.26%)}	_{0.065s (±13.16%)}	_~	_0.056s	_0.098s	_{p=0.101 n=12}
_{Check Time}	_{2.472s (± 0.41%)}	_{2.428s (± 0.20%)}	_{-0.044s (- 1.77%)}	_2.414s	_2.442s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{2.817s (± 0.43%)}	_{2.783s (± 0.31%)}	_{-0.034s (- 1.20%)}	_2.761s	_2.803s	_{p=0.000 n=12}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,060,810	_1,060,743	_{-67 (- 0.01%)}	_~	_~	_{p=0.000 n=12}
_Types	_389,671	_389,443	_{-228 (- 0.06%)}	_~	_~	_{p=0.000 n=12}
_{Memory Used}	_{471,851k (± 0.03%)}	_{471,700k (± 0.02%)}	_~	_471,559k	_471,971k	_{p=0.062 n=12}
_{Memory Allocs}	_{4,218,918 (± 0.07%)}	_{4,218,038 (± 0.09%)}	_~	_4,209,110	_4,228,892	_{p=0.755 n=12}
_{Config Time}	_{0.003s (± 8.64%)}	_{0.003s (± 8.64%)}	_~	_0.002s	_0.003s	_{p=1.000 n=12}
_{Parse Time}	_{0.133s (± 3.07%)}	_{0.133s (± 3.01%)}	_~	_0.126s	_0.142s	_{p=0.989 n=12}
_{Bind Time}	_{0.047s (±14.30%)}	_{0.051s (±14.60%)}	_~	_0.034s	_0.069s	_{p=0.449 n=12}
_{Check Time}	_{1.090s (± 0.77%)}	_{1.087s (± 0.65%)}	_~	_1.070s	_1.110s	_{p=0.680 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.280s (± 0.72%)}	_{1.282s (± 0.61%)}	_~	_1.253s	_1.304s	_{p=0.702 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:

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Copilot AI balanced review requested due to automatic review settings October 19, 2026 17:47

github-project-automation Bot added this to PR Backlog Oct 19, 2026

typescript-automation Bot assigned Jake Bailey (jakebailey) Oct 19, 2026

typescript-automation Bot added the Author: Team label Oct 19, 2026

github-project-automation Bot moved this to Not started in PR Backlog Oct 19, 2026

typescript-automation Bot added the For Uncommitted Bug PR for untriaged, rejected, closed or missing bug label Oct 19, 2026

Copilot started reviewing on behalf of Jake Bailey (jakebailey) October 19, 2026 17:48

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Copilot AI reviewed Oct 19, 2026

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Comment thread tsc/internal/checker/checker.go

func (c *Checker) getSignaturesOfStructuredType(t *Type, kind SignatureKind) []*Signature {

if t.flags&TypeFlagsStructuredType == 0 {

if t.flags&TypeFlagsStructuredType == 0 || isUnresolvedMappedType(t) {

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Don't resolve mapped type members to find their signatures - #64873

Don't resolve mapped type members to find their signatures#64873
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jakebailey:perf/mapped-type-signatures

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typescript-automation Bot commented Oct 19, 2026

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typescript-automation Bot commented Oct 19, 2026 •

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