Avoid short-lived allocations in union and intersection property handling by jakebailey · Pull Request #64815 · microsoft/TypeScript

Jake Bailey (jakebailey) · 2026-10-14T14:18:01Z

Enumerating and reducing union and intersection properties does a lot of short-lived work: it synthesizes properties only to read their flags, collects constituent properties into map-backed sets, and allocates a fresh name set for every enumeration.

Checking whether an intersection reduces to never now inspects the constituent properties directly, and only creates the real property in the rare merged-instantiation case. Previously it built and cached a synthetic property for every shared name, and on MUI's large JSX prop intersections most of those were never looked up again.
Constituent property sources are gathered in the checker's orderedSet, which scans a slice for small sets instead of always allocating a map and key slice.
The name set used during property enumeration is borrowed from a per-checker free list.

Cumulative MUI measurements: 15.43% fewer symbols, 7.55% less retained heap, about 15% fewer allocations, and about 13.5% fewer allocated bytes. Each commit has its own benchstat table. MUI diagnostics are unchanged.

getReducedType runs somePropertyReducesToNever on intersections. It used to create and cache a synthetic property for every property name shared by more than one constituent, only to inspect its flags. With large JSX prop intersections, as in MUI, most of those properties were never looked up again, yet they stayed in the intersection's property cache with their symbols and links. Collect the constituent properties without building the combined symbol, and only create the real property in the rare merged instantiation case. mui-docs: │ before │ after │ │ memory-used-B │ memory-used-B vs base │ MUIDocs 1.857Gi ± 0% 1.717Gi ± 0% -7.55% (p=0.002 n=6) │ before │ after │ │ allocs │ allocs vs base │ MUIDocs 27.29M ± 0% 25.19M ± 0% -7.72% (p=0.002 n=6) │ before │ after │ │ allocated-B │ allocated-B vs base │ MUIDocs 4.730Gi ± 0% 4.556Gi ± 0% -3.68% (p=0.002 n=6) │ before │ after │ │ symbols │ symbols vs base │ MUIDocs 4.332M ± 0% 3.663M ± 0% -15.43% (p=0.002 n=6)

Synthesizing or probing a union or intersection property gathers the distinct constituent properties into a set. That set rarely holds more than a handful of symbols, but collections.OrderedSet always allocates both a map and a key slice, and this runs for every property of every combined type that is enumerated during relation checks. Collect them in the checker's orderedSet instead, which scans a slice for small sets and only builds a map once the set grows large enough for hashing to pay off. mui-docs: │ before │ after │ │ allocs │ allocs vs base │ MUIDocs 25.19M ± 0% 23.32M ± 1% -7.41% (p=0.002 n=6) │ before │ after │ │ allocated-B │ allocated-B vs base │ MUIDocs 4.556Gi ± 0% 4.389Gi ± 1% -3.66% (p=0.002 n=6)

Enumerating the properties of a union or intersection tracks which names have already been combined. A fresh set is allocated for every enumeration, and on large projects those sets account for a sizable share of all allocated bytes, adding GC work for no lasting benefit. Borrow the set from a per-checker free list instead. Enumeration can recurse into other combined types, so each call still takes its own set. mui-docs: │ before │ after │ │ allocated-B │ allocated-B vs base │ MUIDocs 4.389Gi ± 1% 4.092Gi ± 0% -6.76% (p=0.002 n=6) │ before │ after │ │ allocs │ allocs vs base │ MUIDocs 23.32M ± 1% 23.18M ± 0% -0.60% (p=0.002 n=6)

Copilot

🟡 Changes recommended

Popped pool slots retain oversized name sets, defeating the intended retention limit.

1 open finding

Clear popped free-list slot to prevent oversized set retention · New

What changed in this PR

Reduces temporary allocations in the native TypeScript checker's union and intersection property handling.

Changes:

Checks intersection reduction directly from constituent properties.
Uses slice-backed ordered sets for property sources.
Pools name sets used during property enumeration.

File	Description
tsc/internal/checker/utilities.go	Adds name-set borrowing and release helpers.
tsc/internal/checker/checker.go	Refactors property collection and reduction; integrates name-set pooling.

🧠 Review effort: Balanced

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Reslicing the free list left the popped set reachable from the backing array, so a set that later grew past the retention limit and was discarded on release stayed alive until its slot was overwritten.

Jake Bailey (jakebailey) · 2026-10-14T17:13:38Z

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

typescript-automation · 2026-10-14T17:13:50Z

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

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

Copilot

🔵 Needs a closer look

Core type-reduction and caching changes warrant compiler-suite validation and human review before approval.

0 open findings

1 resolved since last review

Clear popped free-list slot to prevent oversized set retention

🧠 Review effort: Balanced

typescript-automation · 2026-10-14T17:52:42Z

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	_113,935	_{-1,341 (- 1.16%)}	_~	_~	_{p=0.000 n=12}
_Types	_79,613	_78,366	_{-1,247 (- 1.57%)}	_~	_~	_{p=0.000 n=12}
_{Memory Used}	_{113,571k (± 0.05%)}	_{112,682k (± 0.03%)}	_{-889k (- 0.78%)}	_112,589k	_112,793k	_{p=0.000 n=12}
_{Memory Allocs}	_{2,212,618 (± 0.01%)}	_{2,196,757 (± 0.01%)}	_{-15,862 (- 0.72%)}	_2,196,433	_2,197,079	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.051s (± 3.25%)}	_{0.049s (± 3.19%)}	_~	_0.045s	_0.053s	_{p=0.180 n=12}
_{Bind Time}	_{0.017s (± 9.63%)}	_{0.016s (± 8.43%)}	_~	_0.014s	_0.020s	_{p=0.675 n=12}
_{Check Time}	_{0.565s (± 0.69%)}	_{0.567s (± 0.82%)}	_~	_0.559s	_0.580s	_{p=0.541 n=12}
_{Emit Time}	_{0.323s (± 2.95%)}	_{0.324s (± 2.29%)}	_~	_0.307s	_0.345s	_{p=0.809 n=12}
_{Total Time}	_{0.963s (± 0.83%)}	_{0.964s (± 0.55%)}	_~	_0.954s	_0.983s	_{p=0.966 n=12}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_{847,166 (± 0.07%)}	_{845,344 (± 0.09%)}	_{-1,822 (- 0.22%)}	_843,310	_847,954	_{p=0.000 n=12}
_Types	_{247,032 (± 0.00%)}	_{246,245 (± 0.00%)}	_{-787 (- 0.32%)}	_246,242	_246,246	_{p=0.000 n=12}
_{Memory Used}	_{596,447k (± 0.02%)}	_{595,721k (± 0.03%)}	_{-726k (- 0.12%)}	_595,314k	_596,247k	_{p=0.000 n=12}
_{Memory Allocs}	_{13,141,564 (± 0.04%)}	_{13,128,818 (± 0.11%)}	_{-12,745 (- 0.10%)}	_13,113,151	_13,196,440	_{p=0.012 n=12}
_{Config Time}	_{0.017s (± 1.99%)}	_{0.017s (± 1.99%)}	_~	_0.016s	_0.017s	_{p=1.000 n=12}
_{Parse Time}	_{0.223s (± 2.69%)}	_{0.228s (± 2.69%)}	_~	_0.212s	_0.244s	_{p=0.235 n=12}
_{Bind Time}	_{0.084s (±12.84%)}	_{0.081s (±12.79%)}	_~	_0.058s	_0.109s	_{p=0.701 n=12}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=12}
_{Emit Time}	_{1.566s (± 1.68%)}	_{1.555s (± 1.54%)}	_~	_1.489s	_1.613s	_{p=0.799 n=12}
_{Total Time}	_{1.911s (± 1.42%)}	_{1.901s (± 1.59%)}	_~	_1.814s	_1.967s	_{p=0.641 n=12}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,331,835	_3,663,340	_{🟩-668,495 (-15.43%)}	_~	_~	_{p=0.000 n=12}
_Types	_1,370,520	_1,362,229	_{-8,291 (- 0.60%)}	_~	_~	_{p=0.000 n=12}
_{Memory Used}	_{2,626,111k (± 0.07%)}	_{2,444,588k (± 0.09%)}	_{🟩-181,523k (- 6.91%)}	_2,438,645k	_2,449,127k	_{p=0.000 n=12}
_{Memory Allocs}	_{27,735,351 (± 0.09%)}	_{23,458,248 (± 0.11%)}	_{🟩-4,277,104 (-15.42%)}	_23,400,569	_23,541,681	_{p=0.000 n=12}
_{Config Time}	_{0.020s (± 1.40%)}	_{0.020s (± 1.40%)}	_~	_0.020s	_0.021s	_{p=1.000 n=12}
_{Parse Time}	_{0.585s (± 3.67%)}	_{0.582s (± 2.94%)}	_~	_0.536s	_0.629s	_{p=0.809 n=12}
_{Bind Time}	_{0.003s (±11.61%)}	_{0.003s (±42.18%)}	_~	_0.002s	_0.010s	_{p=1.000 n=12}
_{Check Time}	_{8.656s (± 0.20%)}	_{7.976s (± 0.33%)}	_{🟩-0.680s (- 7.86%)}	_7.929s	_8.070s	_{p=0.000 n=12}
_{Emit Time}	_{0.703s (±10.94%)}	_{0.578s (± 0.56%)}	_{🟩-0.124s (-17.69%)}	_0.564s	_0.583s	_{p=0.037 n=12}
_{Total Time}	_{10.882s (± 0.76%)}	_{10.121s (± 0.60%)}	_{🟩-0.761s (- 6.99%)}	_10.022s	_10.304s	_{p=0.000 n=12}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,388,669	_1,383,498	_{-5,171 (- 0.37%)}	_~	_~	_{p=0.000 n=12}
_Types	_441,862	_439,714	_{-2,148 (- 0.49%)}	_~	_~	_{p=0.000 n=12}
_{Memory Used}	_{1,310,925k (± 0.37%)}	_{1,315,704k (± 0.68%)}	_~	_1,295,632k	_1,336,462k	_{p=0.671 n=12}
_{Memory Allocs}	_{78,257,069 (± 0.05%)}	_{77,429,738 (± 0.08%)}	_{-827,331 (- 1.06%)}	_77,276,270	_77,532,422	_{p=0.000 n=12}
_{Config Time}	_{0.004s (±10.30%)}	_{0.004s (± 8.72%)}	_~	_0.003s	_0.005s	_{p=0.967 n=12}
_{Parse Time}	_{0.308s (± 1.89%)}	_{0.313s (± 1.92%)}	_~	_0.298s	_0.326s	_{p=0.284 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{1.998s (± 0.45%)}	_{2.005s (± 0.50%)}	_~	_1.983s	_2.041s	_{p=0.266 n=12}
_{Emit Time}	_{0.343s (± 3.46%)}	_{0.361s (± 3.11%)}	_{🔻+0.018s (+ 5.25%)}	_0.339s	_0.399s	_{p=0.029 n=12}
_{Total Time}	_{23.770s (± 0.39%)}	_{23.965s (± 0.75%)}	_{+0.195s (+ 0.82%)}	_23.318s	_24.447s	_{p=0.017 n=12}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_334,953	_331,169	_{-3,784 (- 1.13%)}	_~	_~	_{p=0.000 n=12}
_Types	_197,616	_196,147	_{-1,469 (- 0.74%)}	_~	_~	_{p=0.000 n=12}
_{Memory Used}	_{247,504k (± 0.02%)}	_{244,770k (± 0.03%)}	_{-2,734k (- 1.10%)}	_244,584k	_244,911k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,329,419 (± 0.01%)}	_{4,278,384 (± 0.01%)}	_{-51,035 (- 1.18%)}	_4,277,183	_4,279,936	_{p=0.000 n=12}
_{Config Time}	_{0.000s (±77.74%)}	_{0.001s (±65.70%)}	_~	_0.000s	_0.001s	_{p=1.000 n=12}
_{Parse Time}	_{0.090s (± 4.49%)}	_{0.089s (± 5.40%)}	_~	_0.078s	_0.103s	_{p=0.660 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{0.799s (± 0.58%)}	_{0.800s (± 0.64%)}	_~	_0.789s	_0.813s	_{p=0.559 n=12}
_{Emit Time}	_{0.120s (± 5.14%)}	_{0.118s (± 4.65%)}	_~	_0.105s	_0.130s	_{p=0.680 n=12}
_{Total Time}	_{1.054s (± 0.68%)}	_{1.049s (± 0.70%)}	_~	_1.033s	_1.070s	_{p=0.434 n=12}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_303,834	_302,164	_{-1,670 (- 0.55%)}	_~	_~	_{p=0.000 n=12}
_Types	_181,663	_180,946	_{-717 (- 0.39%)}	_~	_~	_{p=0.000 n=12}
_{Memory Used}	_{215,253k (± 0.02%)}	_{213,756k (± 0.02%)}	_{-1,497k (- 0.70%)}	_213,609k	_213,835k	_{p=0.000 n=12}
_{Memory Allocs}	_{1,401,534 (± 0.02%)}	_{1,373,985 (± 0.02%)}	_{-27,549 (- 1.97%)}	_1,373,503	_1,375,017	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.096s (± 3.77%)}	_{0.101s (± 2.85%)}	_{🔻+0.005s (+ 4.87%)}	_0.092s	_0.106s	_{p=0.040 n=12}
_{Bind Time}	_{0.041s (±10.20%)}	_{0.041s (±10.24%)}	_~	_0.033s	_0.053s	_{p=0.988 n=12}
_{Check Time}	_{0.745s (± 1.31%)}	_{0.742s (± 0.75%)}	_~	_0.733s	_0.758s	_{p=0.831 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.896s (± 0.92%)}	_{0.900s (± 0.42%)}	_~	_0.891s	_0.910s	_{p=0.138 n=12}
_{vscode - native}
_Errors	₃₉₆	₃₉₆	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_11,687,315	_11,663,689	_{-23,626 (- 0.20%)}	_~	_~	_{p=0.000 n=12}
_Types	_3,851,234	_3,840,790	_{-10,444 (- 0.27%)}	_~	_~	_{p=0.000 n=12}
_{Memory Used}	_{5,516,027k (± 0.02%)}	_{5,502,856k (± 0.01%)}	_{-13,170k (- 0.24%)}	_5,500,923k	_5,505,447k	_{p=0.000 n=12}
_{Memory Allocs}	_{56,196,203 (± 0.01%)}	_{55,791,981 (± 0.01%)}	_{-404,222 (- 0.72%)}	_55,786,152	_55,808,560	_{p=0.000 n=12}
_{Config Time}	_{0.061s (± 0.50%)}	_{0.061s (± 0.50%)}	_~	_0.061s	_0.062s	_{p=1.000 n=12}
_{Parse Time}	_{1.375s (± 1.34%)}	_{1.431s (± 2.57%)}	_{🔻+0.056s (+ 4.06%)}	_1.351s	_1.546s	_{p=0.009 n=12}
_{Bind Time}	_{0.550s (±12.71%)}	_{0.469s (±11.81%)}	_~	_0.385s	_0.623s	_{p=0.050 n=12}
_{Check Time}	_{11.151s (± 0.95%)}	_{11.216s (± 0.98%)}	_~	_11.002s	_11.409s	_{p=0.755 n=12}
_{Emit Time}	_{4.710s (± 7.36%)}	_{4.439s (± 9.02%)}	_~	_3.650s	_5.213s	_{p=0.671 n=12}
_{Total Time}	_{17.927s (± 1.42%)}	_{17.688s (± 1.78%)}	_~	_17.047s	_18.311s	_{p=0.478 n=12}
_{webpack - native}
_Errors	₅₈₄	₅₈₄	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,299,351	_1,281,486	_{-17,865 (- 1.37%)}	_~	_~	_{p=0.000 n=12}
_Types	_598,360	_592,382	_{-5,978 (- 1.00%)}	_~	_~	_{p=0.000 n=12}
_{Memory Used}	_{789,533k (± 0.02%)}	_{779,642k (± 0.01%)}	_{-9,890k (- 1.25%)}	_779,371k	_779,847k	_{p=0.000 n=12}
_{Memory Allocs}	_{6,054,428 (± 0.03%)}	_{5,894,784 (± 0.03%)}	_{-159,644 (- 2.64%)}	_5,891,863	_5,902,228	_{p=0.000 n=12}
_{Config Time}	_0.009s	_0.009s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.296s (± 3.11%)}	_{0.297s (± 2.26%)}	_~	_0.283s	_0.321s	_{p=0.808 n=12}
_{Bind Time}	_{0.080s (±15.07%)}	_{0.072s (± 4.26%)}	_~	_0.065s	_0.083s	_{p=0.433 n=12}
_{Check Time}	_{1.961s (± 0.54%)}	_{1.948s (± 0.57%)}	_~	_1.917s	_1.968s	_{p=0.110 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{2.383s (± 0.54%)}	_{2.363s (± 0.50%)}	_{-0.020s (- 0.86%)}	_2.339s	_2.396s	_{p=0.021 n=12}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,062,854	_1,059,632	_{-3,222 (- 0.30%)}	_~	_~	_{p=0.000 n=12}
_Types	_390,845	_389,898	_{-947 (- 0.24%)}	_~	_~	_{p=0.000 n=12}
_{Memory Used}	_{472,329k (± 0.04%)}	_{470,799k (± 0.02%)}	_{-1,530k (- 0.32%)}	_470,617k	_471,081k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,225,611 (± 0.08%)}	_{4,149,319 (± 0.08%)}	_{-76,292 (- 1.81%)}	_4,141,173	_4,156,661	_{p=0.000 n=12}
_{Config Time}	_{0.003s (± 8.64%)}	_0.003s	_~	_~	_~	_{p=0.478 n=12}
_{Parse Time}	_{0.135s (± 3.08%)}	_{0.135s (± 3.15%)}	_~	_0.127s	_0.145s	_{p=0.921 n=12}
_{Bind Time}	_{0.053s (±15.01%)}	_{0.046s (±15.28%)}	_~	_0.033s	_0.068s	_{p=0.154 n=12}
_{Check Time}	_{0.994s (± 0.60%)}	_{0.990s (± 1.05%)}	_~	_0.970s	_1.025s	_{p=0.182 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.190s (± 0.89%)}	_{1.181s (± 0.95%)}	_~	_1.154s	_1.209s	_{p=0.236 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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typescript-automation Bot assigned Jake Bailey (jakebailey) Oct 14, 2026

typescript-automation Bot added Author: Team For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Oct 14, 2026

Jake Bailey (jakebailey) mentioned this pull request Oct 14, 2026

Various memory optimizations #64734

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Jake Bailey (jakebailey) added this pull request to stack #64806 October 14, 2026 14:20

Jake Bailey (jakebailey) changed the title ~~Check never-reducing intersection properties without creating them~~ Probe never-reducing intersection properties without synthesizing them Oct 14, 2026

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/never-reduction-probes branch from 7337902 to 2473949 Compare October 14, 2026 16:02

Jake Bailey (jakebailey) added 3 commits October 14, 2026 09:14

Jake Bailey (jakebailey) removed this pull request from stack #64806 October 14, 2026 16:55

Jake Bailey (jakebailey) changed the base branch from jakebailey/mem/shared-property-cache to main October 14, 2026 16:56

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/never-reduction-probes branch from 2473949 to e2fcf0f Compare October 14, 2026 16:56

This was referenced Oct 14, 2026

Use small slices for union and intersection property sources #64816

Closed

Reuse name sets when enumerating union and intersection properties #64817

Closed

Jake Bailey (jakebailey) changed the title ~~Probe never-reducing intersection properties without synthesizing them~~ Avoid short-lived allocations in union and intersection property handling Oct 14, 2026

Jake Bailey (jakebailey) marked this pull request as ready for review October 14, 2026 16:58

Copilot AI balanced review requested due to automatic review settings October 14, 2026 16:58

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Comment thread tsc/internal/checker/utilities.go

Drop popped name sets from the free list's backing array

5a40773

Reslicing the free list left the popped set reachable from the backing array, so a set that later grew past the retention limit and was discarded on release stayed alive until its slot was overwritten.

Jake Bailey (jakebailey) requested a balanced review from Copilot October 14, 2026 17:13

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Avoid short-lived allocations in union and intersection property handling - #64815

Avoid short-lived allocations in union and intersection property handling#64815
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🔵 Needs a closer look

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typescript-automation Bot commented Oct 14, 2026

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Jake Bailey (jakebailey) commented Oct 14, 2026 •

edited

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typescript-automation Bot commented Oct 14, 2026 •

edited

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