Probe links without creating them on read-only paths by jakebailey · Pull Request #65021 · microsoft/TypeScript

Jake Bailey (jakebailey) · 2026-10-29T20:03:49Z

Get on a link store allocates and inserts a fresh record when none exists. Many checker paths only read a field from a links record (resolvedSymbol, resolvedType, nameType, target, resolvedSignature) and treat an absent record the same as a zero one, so calling Get there allocates link records, and grows the backing maps and pages, for nodes and symbols that never needed them.

Use TryGet on those paths instead, and let the ValueSymbolLinks nameType/containingType accessors accept a nil receiver so the common "copy the name type from the source symbol" pattern can probe without allocating.

Thanks Steven (@teamchong) for finding this!

Get on a link store allocates and inserts a fresh record when none exists. Many checker paths only read a field from a links record (resolvedSymbol, resolvedType, nameType, target, resolvedSignature) and treat an absent record the same as a zero one, so calling Get there allocates link records, and grows the backing maps and pages, for nodes and symbols that never needed them. Use TryGet on those paths instead, and let the ValueSymbolLinks nameType/containingType accessors accept a nil receiver so the common "copy the name type from the source symbol" pattern can probe without allocating. Co-authored-by: Steven Chong <25894545+teamchong@users.noreply.github.com>

Jake Bailey (jakebailey) · 2026-10-29T20:04:00Z

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

typescript-automation · 2026-10-29T20:04:06Z

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

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

Copilot

🟢 Approval recommended

No active review issues are reported for the changes that reduce unnecessary checker-link allocations.

No open issues 🎉

What changed in this PR

This PR reduces unnecessary checker allocations by probing existing link records on read-only paths instead of creating empty records.

Changes:

Replace allocating Get calls with TryGet for read-only symbol, type, and signature lookups.
Make name-type and containing-type accessors safe for nil link records.
Reuse lookup helpers to preserve absent-record behavior without allocation.

File	Description
`tsc/internal/checker/types.go`	Allow nil receivers in name-type and containing-type accessors.
`tsc/internal/checker/inference.go`	Copy reverse-mapped property name types without allocating source links.
`tsc/internal/checker/checker.go`	Use non-allocating probes across read-only checker paths.

_{Review effort: Balanced}

typescript-automation · 2026-10-29T21:13:23Z

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=20}
_Symbols	_88,466	_88,466	_~	_~	_~	_{p=1.000 n=20}
_Types	_79,607	_79,607	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{104,117k (± 0.03%)}	_{103,945k (± 0.03%)}	_{-172k (- 0.17%)}	_103,837k	_104,085k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,263,799 (± 0.01%)}	_{1,263,568 (± 0.01%)}	_{-230 (- 0.02%)}	_1,263,223	_1,263,895	_{p=0.002 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.023s (± 2.76%)}	_{0.023s (± 2.70%)}	_~	_0.020s	_0.025s	_{p=0.220 n=20}
_{Bind Time}	_{0.008s (± 4.90%)}	_{0.009s (± 5.74%)}	_~	_0.007s	_0.011s	_{p=0.194 n=20}
_{Check Time}	_{0.212s (± 0.87%)}	_{0.212s (± 0.60%)}	_~	_0.207s	_0.218s	_{p=0.994 n=20}
_{Emit Time}	_{0.139s (± 1.19%)}	_{0.140s (± 3.76%)}	_~	_0.134s	_0.187s	_{p=0.200 n=20}
_{Total Time}	_{0.386s (± 0.61%)}	_{0.387s (± 1.61%)}	_~	_0.380s	_0.443s	_{p=0.662 n=20}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_{586,607 (± 0.01%)}	_{586,524 (± 0.01%)}	_~	_586,239	_586,819	_{p=0.129 n=20}
_Types	_{241,687 (± 0.00%)}	_{241,688 (± 0.00%)}	_~	_241,683	_241,698	_{p=0.872 n=20}
_{Memory Used}	_{517,999k (± 0.02%)}	_{516,350k (± 0.02%)}	_{-1,649k (- 0.32%)}	_515,986k	_516,926k	_{p=0.000 n=20}
_{Memory Allocs}	_{7,796,543 (± 0.10%)}	_{7,795,937 (± 0.10%)}	_~	_7,783,042	_7,837,226	_{p=0.277 n=20}
_{Config Time}	_0.009s	_0.009s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.130s (± 3.25%)}	_{0.128s (± 2.38%)}	_~	_0.117s	_0.146s	_{p=0.597 n=20}
_{Bind Time}	_{0.042s (± 7.25%)}	_{0.043s (± 7.85%)}	_~	_0.039s	_0.065s	_{p=0.895 n=20}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=20}
_{Emit Time}	_{0.858s (± 0.93%)}	_{0.870s (± 1.38%)}	_~	_0.838s	_0.948s	_{p=0.101 n=20}
_{Total Time}	_{1.049s (± 1.05%)}	_{1.061s (± 1.41%)}	_~	_1.023s	_1.142s	_{p=0.218 n=20}
_{arktype - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_685,920	_685,920	_~	_~	_~	_{p=1.000 n=20}
_Types	_939,467	_939,467	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{497,255k (± 0.01%)}	_{496,743k (± 0.01%)}	_{-512k (- 0.10%)}	_496,595k	_496,872k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,107,544 (± 0.01%)}	_{12,108,012 (± 0.01%)}	_~	_12,103,456	_12,115,920	_{p=0.718 n=20}
_{Config Time}	_0.001s	_{0.001s (±18.96%)}	_~	_0.001s	_0.003s	_{p=1.000 n=20}
_{Parse Time}	_{0.041s (± 3.57%)}	_{0.043s (± 6.81%)}	_~	_0.035s	_0.060s	_{p=0.461 n=20}
_{Bind Time}	_{0.013s (± 8.71%)}	_{0.014s (±12.41%)}	_~	_0.011s	_0.027s	_{p=0.207 n=20}
_{Check Time}	_{0.994s (± 0.90%)}	_{1.005s (± 1.29%)}	_~	_0.968s	_1.095s	_{p=0.167 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.079s (± 0.87%)}	_{1.095s (± 1.21%)}	_~	_1.056s	_1.179s	_{p=0.062 n=20}
_{class-transformer - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_45,376	_45,376	_~	_~	_~	_{p=1.000 n=20}
_Types	_7,573	_7,573	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{27,836k (± 0.02%)}	_{27,758k (± 0.02%)}	_{-78k (- 0.28%)}	_27,734k	_27,791k	_{p=0.000 n=20}
_{Memory Allocs}	_{248,619 (± 0.04%)}	_{248,586 (± 0.06%)}	_~	_248,232	_249,743	_{p=0.211 n=20}
_{Config Time}	_{0.000s (±208.60%)}	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.012s (± 8.94%)}	_{0.011s (± 4.22%)}	_~	_0.009s	_0.013s	_{p=0.323 n=20}
_{Bind Time}	_{0.004s (±13.91%)}	_{0.003s (± 8.69%)}	_~	_0.002s	_0.005s	_{p=0.052 n=20}
_{Check Time}	_{0.008s (± 5.20%)}	_{0.008s (± 3.84%)}	_~	_0.007s	_0.009s	_{p=0.545 n=20}
_{Emit Time}	_{0.009s (±14.39%)}	_{0.008s (± 5.47%)}	_~	_0.007s	_0.010s	_{p=0.135 n=20}
_{Total Time}	_{0.034s (± 7.58%)}	_{0.032s (± 2.10%)}	_{🟩-0.002s (- 5.94%)}	_0.029s	_0.034s	_{p=0.049 n=20}
_{effect - native}
_Errors	₁₂	₁₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,235,115	_1,235,115	_~	_~	_~	_{p=1.000 n=20}
_Types	_894,113	_894,113	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{940,547k (± 0.02%)}	_{938,915k (± 0.02%)}	_{-1,633k (- 0.17%)}	_938,107k	_939,640k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,677,721 (± 0.06%)}	_{12,668,137 (± 0.02%)}	_{-9,584 (- 0.08%)}	_12,659,793	_12,679,387	_{p=0.035 n=20}
_{Config Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.148s (± 1.69%)}	_{0.148s (± 1.47%)}	_~	_0.140s	_0.155s	_{p=0.984 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.933s (± 0.81%)}	_{0.928s (± 0.60%)}	_~	_0.914s	_0.950s	_{p=0.402 n=20}
_{Emit Time}	_{0.504s (± 2.10%)}	_{0.503s (± 2.34%)}	_~	_0.444s	_0.550s	_{p=0.857 n=20}
_{Total Time}	_{1.677s (± 0.49%)}	_{1.675s (± 0.64%)}	_~	_1.619s	_1.718s	_{p=0.597 n=20}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_3,784,019	_3,784,019	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,355,974	_1,355,974	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{1,837,243k (± 0.06%)}	_{1,834,093k (± 0.09%)}	_{-3,150k (- 0.17%)}	_1,828,238k	_1,838,931k	_{p=0.005 n=20}
_{Memory Allocs}	_{26,047,755 (± 0.15%)}	_{25,974,494 (± 0.10%)}	_{-73,260 (- 0.28%)}	_25,911,608	_26,100,927	_{p=0.003 n=20}
_{Config Time}	_{0.008s (± 2.82%)}	_{0.009s (± 2.82%)}	_~	_0.008s	_0.009s	_{p=1.000 n=20}
_{Parse Time}	_{0.297s (± 2.10%)}	_{0.295s (± 2.40%)}	_~	_0.266s	_0.321s	_{p=0.654 n=20}
_{Bind Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{3.232s (± 1.67%)}	_{3.244s (± 1.57%)}	_~	_3.143s	_3.566s	_{p=0.644 n=20}
_{Emit Time}	_{0.259s (± 3.38%)}	_{0.252s (± 1.76%)}	_~	_0.237s	_0.275s	_{p=0.285 n=20}
_{Total Time}	_{4.301s (± 1.35%)}	_{4.308s (± 1.23%)}	_~	_4.155s	_4.621s	_{p=0.673 n=20}
_{sentry - native}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,793,245	_4,793,245	_~	_~	_~	_{p=1.000 n=20}
_Types	_2,607,045	_2,607,045	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{2,880,229k (± 0.04%)}	_{2,866,938k (± 0.03%)}	_{-13,291k (- 0.46%)}	_2,865,315k	_2,871,299k	_{p=0.000 n=20}
_{Memory Allocs}	_{75,327,068 (± 0.18%)}	_{75,473,660 (± 0.39%)}	_~	_74,929,154	_77,682,174	_{p=0.968 n=20}
_{Config Time}	_{0.026s (± 1.59%)}	_{0.027s (± 7.41%)}	_~	_0.025s	_0.045s	_{p=0.991 n=20}
_{Parse Time}	_{0.571s (± 7.14%)}	_{0.552s (± 5.33%)}	_~	_0.461s	_0.684s	_{p=0.703 n=20}
_{Bind Time}	_{0.179s (±11.10%)}	_{0.191s (±11.29%)}	_~	_0.140s	_0.283s	_{p=0.365 n=20}
_{Check Time}	_{7.502s (± 0.76%)}	_{7.524s (± 0.68%)}	_~	_7.377s	_7.811s	_{p=0.490 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{8.335s (± 0.90%)}	_{8.353s (± 0.83%)}	_~	_8.139s	_8.580s	_{p=0.693 n=20}
_{social-app - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,883,074	_1,883,074	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,158,168	_1,158,168	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{972,480k (± 0.02%)}	_{970,432k (± 0.02%)}	_{-2,048k (- 0.21%)}	_969,578k	_971,044k	_{p=0.000 n=20}
_{Memory Allocs}	_{13,573,771 (± 0.28%)}	_{13,572,743 (± 0.21%)}	_~	_13,513,559	_13,779,246	_{p=0.841 n=20}
_{Config Time}	_0.008s	_0.008s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.156s (± 2.33%)}	_{0.159s (± 2.82%)}	_~	_0.145s	_0.182s	_{p=0.551 n=20}
_{Bind Time}	_{0.045s (±10.35%)}	_{0.048s (±10.31%)}	_~	_0.038s	_0.071s	_{p=0.581 n=20}
_{Check Time}	_{1.480s (± 0.55%)}	_{1.476s (± 0.59%)}	_~	_1.436s	_1.513s	_{p=0.753 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.705s (± 0.53%)}	_{1.709s (± 0.69%)}	_~	_1.673s	_1.768s	_{p=0.588 n=20}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,184,972	_1,184,972	_~	_~	_~	_{p=1.000 n=20}
_Types	_438,963	_438,963	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{1,168,492k (± 0.33%)}	_{1,164,130k (± 0.32%)}	_{-4,362k (- 0.37%)}	_1,154,598k	_1,185,148k	_{p=0.049 n=20}
_{Memory Allocs}	_{47,695,459 (± 0.11%)}	_{47,669,107 (± 0.11%)}	_~	_47,477,863	_47,946,973	_{p=0.414 n=20}
_{Config Time}	_{0.002s (±10.63%)}	_{0.002s (±15.95%)}	_~	_0.001s	_0.003s	_{p=0.853 n=20}
_{Parse Time}	_{0.139s (± 1.48%)}	_{0.138s (± 1.30%)}	_~	_0.131s	_0.146s	_{p=0.846 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.806s (± 0.32%)}	_{0.807s (± 0.48%)}	_~	_0.793s	_0.823s	_{p=0.941 n=20}
_{Emit Time}	_{0.140s (± 1.21%)}	_{0.141s (± 1.62%)}	_~	_0.135s	_0.157s	_{p=0.908 n=20}
_{Total Time}	_{9.358s (± 0.28%)}	_{9.370s (± 0.27%)}	_~	_9.304s	_9.492s	_{p=0.560 n=20}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_263,511	_263,511	_~	_~	_~	_{p=1.000 n=20}
_Types	_196,116	_196,116	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{224,568k (± 0.02%)}	_{224,029k (± 0.02%)}	_{-538k (- 0.24%)}	_223,865k	_224,223k	_{p=0.000 n=20}
_{Memory Allocs}	_{2,400,904 (± 0.01%)}	_{2,400,826 (± 0.01%)}	_~	_2,399,682	_2,402,228	_{p=0.461 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.050s (± 3.21%)}	_{0.049s (± 3.32%)}	_~	_0.043s	_0.056s	_{p=0.308 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.377s (± 0.75%)}	_{0.375s (± 0.57%)}	_~	_0.366s	_0.384s	_{p=0.278 n=20}
_{Emit Time}	_{0.046s (± 4.20%)}	_{0.049s (± 5.05%)}	_{🔻+0.004s (+ 8.33%)}	_0.042s	_0.059s	_{p=0.026 n=20}
_{Total Time}	_{0.500s (± 0.82%)}	_{0.500s (± 0.61%)}	_~	_0.491s	_0.518s	_{p=0.587 n=20}
_{t3code-server - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,350,661	_4,350,661	_~	_~	_~	_{p=1.000 n=20}
_Types	_3,040,644	_3,040,644	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{2,433,776k (± 0.02%)}	_{2,419,576k (± 0.02%)}	_{-14,201k (- 0.58%)}	_2,417,841k	_2,421,635k	_{p=0.000 n=20}
_{Memory Allocs}	_{37,408,073 (± 0.11%)}	_{37,331,615 (± 0.05%)}	_{-76,458 (- 0.20%)}	_37,277,787	_37,430,390	_{p=0.000 n=20}
_{Config Time}	_{0.003s (± 3.54%)}	_0.003s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.253s (± 1.87%)}	_{0.249s (± 1.76%)}	_~	_0.236s	_0.270s	_{p=0.119 n=20}
_{Bind Time}	_{0.086s (± 9.20%)}	_{0.087s (± 9.52%)}	_~	_0.074s	_0.142s	_{p=0.523 n=20}
_{Check Time}	_{7.246s (± 0.58%)}	_{7.267s (± 0.83%)}	_~	_7.132s	_7.745s	_{p=0.758 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.598s (± 0.54%)}	_{7.618s (± 0.81%)}	_~	_7.470s	_8.082s	_{p=0.825 n=20}
_{tanstack-router - native}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_571,756	_571,756	_~	_~	_~	_{p=1.000 n=20}
_Types	_397,689	_397,689	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{331,417k (± 0.02%)}	_{330,698k (± 0.01%)}	_{-719k (- 0.22%)}	_330,563k	_330,877k	_{p=0.000 n=20}
_{Memory Allocs}	_{4,391,298 (± 0.14%)}	_{4,392,136 (± 0.16%)}	_~	_4,376,311	_4,423,056	_{p=0.947 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.043s (± 5.46%)}	_{0.044s (± 3.80%)}	_~	_0.037s	_0.049s	_{p=0.277 n=20}
_{Bind Time}	_{0.015s (±11.23%)}	_{0.015s (±10.46%)}	_~	_0.012s	_0.021s	_{p=0.756 n=20}
_{Check Time}	_{0.616s (± 1.58%)}	_{0.621s (± 1.45%)}	_~	_0.583s	_0.662s	_{p=0.273 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.694s (± 1.74%)}	_{0.702s (± 1.37%)}	_~	_0.658s	_0.742s	_{p=0.129 n=20}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_231,616	_231,616	_~	_~	_~	_{p=1.000 n=20}
_Types	_181,195	_181,195	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{193,518k (± 0.02%)}	_{193,012k (± 0.01%)}	_{-505k (- 0.26%)}	_192,929k	_193,134k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,318,003 (± 0.01%)}	_{1,317,616 (± 0.01%)}	_{-388 (- 0.03%)}	_1,317,017	_1,318,274	_{p=0.006 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.043s (± 2.26%)}	_{0.044s (± 2.86%)}	_~	_0.040s	_0.048s	_{p=0.194 n=20}
_{Bind Time}	_{0.022s (± 5.52%)}	_{0.021s (± 6.72%)}	_~	_0.017s	_0.027s	_{p=0.540 n=20}
_{Check Time}	_{0.295s (± 0.98%)}	_{0.293s (± 1.19%)}	_~	_0.283s	_0.309s	_{p=0.323 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.366s (± 0.75%)}	_{0.365s (± 1.01%)}	_~	_0.352s	_0.384s	_{p=0.350 n=20}
_{vscode - native}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_7,500,937	_7,500,937	_~	_~	_~	_{p=1.000 n=20}
_Types	_4,414,391	_4,414,391	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{5,204,531k (± 0.01%)}	_{5,155,092k (± 0.02%)}	_{-49,440k (- 0.95%)}	_5,152,062k	_5,160,276k	_{p=0.000 n=20}
_{Memory Allocs}	_{56,963,477 (± 0.04%)}	_{56,866,862 (± 0.01%)}	_{-96,615 (- 0.17%)}	_56,853,850	_56,921,912	_{p=0.000 n=20}
_{Config Time}	_{0.037s (± 0.50%)}	_{0.037s (± 0.71%)}	_~	_0.036s	_0.039s	_{p=1.000 n=20}
_{Parse Time}	_{0.906s (± 2.30%)}	_{0.905s (± 1.35%)}	_~	_0.865s	_0.961s	_{p=0.654 n=20}
_{Bind Time}	_{0.305s (± 5.99%)}	_{0.299s (± 1.37%)}	_~	_0.290s	_0.321s	_{p=0.713 n=20}
_{Check Time}	_{7.958s (± 0.46%)}	_{7.960s (± 0.34%)}	_~	_7.804s	_8.037s	_{p=0.784 n=20}
_{Emit Time}	_{2.757s (± 5.11%)}	_{2.714s (± 3.32%)}	_~	_2.587s	_3.353s	_{p=0.995 n=20}
_{Total Time}	_{12.022s (± 0.95%)}	_{11.974s (± 0.60%)}	_~	_11.831s	_12.467s	_{p=0.758 n=20}
_{webpack - native}
_Errors	₆₁₆	₆₁₆	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_917,188	_917,188	_~	_~	_~	_{p=1.000 n=20}
_Types	_636,859	_636,859	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{693,580k (± 0.02%)}	_{692,026k (± 0.02%)}	_{-1,554k (- 0.22%)}	_691,702k	_692,664k	_{p=0.000 n=20}
_{Memory Allocs}	_{6,501,304 (± 0.04%)}	_{6,499,342 (± 0.06%)}	_{-1,963 (- 0.03%)}	_6,491,537	_6,522,026	_{p=0.035 n=20}
_{Config Time}	_{0.004s (±18.96%)}	_0.004s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.150s (±10.52%)}	_{0.140s (± 3.09%)}	_~	_0.123s	_0.156s	_{p=0.432 n=20}
_{Bind Time}	_{0.045s (±11.39%)}	_{0.047s (±11.58%)}	_~	_0.037s	_0.073s	_{p=0.430 n=20}
_{Check Time}	_{1.126s (± 0.49%)}	_{1.132s (± 0.43%)}	_~	_1.107s	_1.151s	_{p=0.103 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.348s (± 1.46%)}	_{1.347s (± 0.58%)}	_~	_1.326s	_1.386s	_{p=0.228 n=20}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_640,490	_640,490	_~	_~	_~	_{p=1.000 n=20}
_Types	_387,984	_387,984	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{350,939k (± 0.03%)}	_{350,091k (± 0.02%)}	_{-847k (- 0.24%)}	_349,823k	_350,431k	_{p=0.000 n=20}
_{Memory Allocs}	_{3,990,995 (± 0.06%)}	_{3,989,811 (± 0.06%)}	_~	_3,980,239	_4,000,303	_{p=0.495 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.062s (± 3.33%)}	_{0.063s (± 3.49%)}	_~	_0.053s	_0.073s	_{p=0.672 n=20}
_{Bind Time}	_{0.023s (±11.72%)}	_{0.023s (±11.84%)}	_~	_0.017s	_0.035s	_{p=0.494 n=20}
_{Check Time}	_{0.430s (± 1.61%)}	_{0.426s (± 1.25%)}	_~	_0.409s	_0.453s	_{p=0.449 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.522s (± 1.64%)}	_{0.518s (± 1.08%)}	_~	_0.499s	_0.545s	_{p=0.888 n=20}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
arktype - native
class-transformer - native
effect - native
mui-docs - native
sentry - native
social-app - native
strada-build-src - native
strada-compiler - native
t3code-server - native
tanstack-router - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₂₀
_Baseline	_baseline	₂₀

Developer Information:

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Ryan Cavanaugh (RyanCavanaugh)

Reviewed at 61bf64c. Absent-link reads preserve the previous zero-record semantics, including name-type copies and guarded symbol/target/signature reads; allocating writes remain intact. Checker tests and targeted spread, reverse-mapping, private-member, and CommonJS compiler baselines passed. No blocking issue found.

Copilot AI balanced review requested due to automatic review settings October 29, 2026 20:03

github-project-automation Bot added this to PR Backlog Oct 29, 2026

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typescript-automation Bot added For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Oct 29, 2026

Copilot started reviewing on behalf of Jake Bailey (jakebailey) October 29, 2026 20:04

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Jake Bailey (jakebailey) added the Domain: Performance Reports of unusually slow behavior label Oct 29, 2026

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Probe links without creating them on read-only paths - #65021

Probe links without creating them on read-only paths#65021
Jake Bailey (jakebailey) wants to merge 1 commit into
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