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ts-performance-rules

TypeScript and JavaScript performance and code-quality rules, usable in any framework. Use when writing, reviewing, or refactoring hot paths, data-structure choices, async flows, or bundle-size-sensitive code. Triggers include "optimize this function", "too slow", "reduce allocations", "bundle size", "lazy load", "speed up imports", or general code review of utilities and services.

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含まれるファイル（25）

SKILL.md3.3 KB
rules/async-cheap-condition-before-await.md1.2 KB
rules/async-defer-await.md2.2 KB
rules/async-dependencies.md1.3 KB
rules/async-parallel.md650 B
rules/bundle-analyzable-paths.md2.3 KB
rules/bundle-barrel-imports.md2.7 KB
rules/bundle-conditional.md966 B
rules/bundle-defer-third-party.md924 B
rules/bundle-dynamic-imports.md795 B
rules/bundle-preload.md1.1 KB
rules/js-batch-dom-css.md3.2 KB
rules/js-cache-function-results.md1.9 KB
rules/js-cache-property-access.md536 B
rules/js-cache-storage.md1.6 KB
rules/js-combine-iterations.md768 B
rules/js-early-exit.md1.1 KB
rules/js-flatmap-filter.md1.4 KB
rules/js-hoist-regexp.md1.0 KB
rules/js-index-maps.md850 B
rules/js-length-check-first.md1.7 KB
rules/js-min-max-loop.md2.2 KB
rules/js-request-idle-callback.md2.6 KB
rules/js-set-map-lookups.md532 B
rules/js-tosorted-immutable.md1.7 KB

SKILL.md（原文）

インストールする前に、エージェントに与えられる指示の中身を確認できます。

TypeScript performance rules

A rule catalog for TypeScript/JavaScript code in this repository. Rules are framework-neutral: they apply to the CLI, the agent engines, the gateway, and the web apps. Each rule file states its impact band, an incorrect/correct pair, and the reasoning.

Derived from Vercel's react-best-practices rule catalog (MIT); the React-component-specific rules are intentionally not part of this skill.

Rule index

Plain JavaScript efficiency (`js-*.md`)

Rule	Applies when
`js-early-exit`	Loops keep scanning after the answer is known
`js-length-check-first`	Cheap guards can precede expensive calls
`js-set-map-lookups`	Arrays are scanned inside loops for membership
`js-index-maps`	Repeated lookups rebuild the same index
`js-flatmap-filter`	`filter().map()` (or the reverse) makes two passes
`js-combine-iterations`	Multiple loops over the same array can share one pass
`js-hoist-regexp`	Regex literals or constructions sit inside hot loops
`js-min-max-loop`	`Math.min(...bigArray)` style spreads blow the stack or re-scan
`js-cache-function-results`	Pure functions recompute the same inputs
`js-cache-property-access`	Deep property chains are read repeatedly in loops
`js-cache-storage`	`localStorage`/`sessionStorage` reads sit in hot paths
`js-batch-dom-css`	DOM style reads/writes alternate and force layout thrash
`js-request-idle-callback`	Non-urgent work blocks interaction
`js-tosorted-immutable`	`.sort()` mutates arrays that callers own

Async structure (`async-*.md`)

Rule	Applies when
`async-cheap-condition-before-await`	A cheap guard sits after an expensive `await`
`async-defer-await`	Independent awaits run serially for no reason
`async-parallel`	Independent promises could run through `Promise.all`
`async-dependencies`	A chain of awaits hides which steps truly depend on each other

Bundle size (`bundle-*.md`)

Rule	Applies when
`bundle-barrel-imports`	Imports pull whole barrel files for one symbol
`bundle-conditional`	Large dependencies load for features that are rarely enabled
`bundle-defer-third-party`	Third-party SDKs load eagerly at startup
`bundle-dynamic-imports`	Rare code paths could be `import()` splits
`bundle-preload`	Known-next navigations could preload their chunks
`bundle-analyzable-paths`	Dynamic import paths are built in ways bundlers cannot trace

How to apply

Pick rules by the code's actual shape, not by keyword match alone; the impact band in each rule's frontmatter says how much it typically matters.
Apply the smallest change that satisfies the rule; do not restructure working code beyond the rule's scope.
For repository-specific constraints, the nearest AGENTS.md and the package's own tests win over these general rules.

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