jsperf-lint
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Zero-dependency Node / pure JS heuristics over .js / .mjs / .cjs / .ts / .tsx (line windows; not a full parser).
Rules (v0)
| ID | app | engine | all | Summary |
|---|---|---|---|---|
| jp-alloc-hot | off | off | error | .push({ / non-empty binders / clear new / Object.create (G3 OK-idiom → off) |
| jp-console-hot | off | hint | error | console.* — remove or gate; cost adds up even off a hot path |
| jp-delete-shape | off | off | error | delete on a plain member / computed key (G3 OK-idiom on Node → off) |
| jp-delete-array-hole | error | error | error | delete arr[i] — holey arrays (G4; narrowed index heuristic) |
| jp-map-filter-chain | hint | hint | error | chained .map/.filter/.flatMap; cost grows with length |
| jp-regex-ctor-hot | hint | hint | error | new RegExp when the pattern is stable (not a loop binding) |
| jp-json-hot | hint | hint | error | JSON.parse / JSON.stringify when the text is stable (not a loop binding) |
| jp-dom-query-hot | hint | hint | error | querySelector / getElementById when the selector is stable (not a loop binding) |
| jp-intl-datetimeformat-hot | hint | hint | error | new Intl.DateTimeFormat when locale/options are stable (not a loop binding) |
| jp-readfile-sync-hot | hint | hint | error | readFileSync when the path is stable (not a loop binding) |
| jp-clock-hot | hint | hint | error | Date.now / performance.now when a fresh time is not required each call |
| jp-query-all-star | hint | hint | error | querySelectorAll('*') full-tree walk (also sees scripts inside executeJavaScript templates) |
| jp-execjs-in-timer | hint | hint | error | built executeJavaScript / evaluate script re-sent from setInterval / setTimeout |
| jp-clone-per-event | hint | hint | error | structuredClone / JSON.parse(JSON.stringify(...)) on an event-like payload |
Scope (orthogonal to presets): default --scope all reports the smells above everywhere — extreme performance stacks care about drip-by-drip cost, not only loops. Opt in to --scope loop for the former in-loop-only matching (loop headers and nested function/arrow bodies defined inside a loop stay out of that narrower match). Loop-binding arguments still suppress hoist-style rules when the call sits in a loop. Path skips include e2e/, playwright-report/, and *.test.* / *.spec.*. Template-string scripts passed to executeJavaScript / evaluate are scanned.
Finding messages describe the smell and invite a fix; they do not tell readers or models that non-loop sites are out of scope.
Does not detect IC polymorphism, elements-kind at runtime, or deopts — see guide §4.5.
Usage
node jsperf-lint/bin/jsperf-lint.js PATH... [--format text|json]
node jsperf-lint/bin/jsperf-lint.js PATH... --preset app|engine|all
node jsperf-lint/bin/jsperf-lint.js PATH... --scope all|loop
node jsperf-lint/bin/jsperf-lint.js PATH... --severity jp-alloc-hot=error --severity jp-map-filter-chain=off
node jsperf-lint/bin/jsperf-lint.js PATH... --strict-hints
node jsperf-lint/bin/jsperf-lint.js PATH... --no-failDefault --preset app. Default --scope all. --severity overrides the preset. Text: path:line: error jp-delete-array-hole: …. JSON includes "severity". Exit 1 only for error findings (hints print but exit 0 unless --strict-hints).
Self-lint (mandatory dogfood)
cd packages/jsperf
npm run self-lint # lints bin/ + lib/; must exit 0 with 0 findings
npm test # fixtures + preset smokeDogfood corpora: ../docs/corpus.md (trees are not shipped; clone locally). Corpus-ready: yes (2026-10-22 redesign).
Evidence
Measured gates: ../evidence/jp-*.{md,jsonl} (jp-delete-array-hole → error; jp-delete-shape demoted off after G3 despite JSONL; jp-map-filter-chain has JSONL and stays hint because a short array is a different cost). jp-string-plus-in-loop is removed. jp-dom-query-hot and jp-intl-datetimeformat-hot have JSONL and stay hint (not corpus-triaged; outside the 2026-10-22 verdict). Policy: ../docs/evidence-policy.md.