@codelaw/rules-js · codelaw-rules-js
codelaw's core JavaScript rules, which also run on TypeScript, JSX and TSX — one of codelaw's first-party rule packs
(SR-RULE-PACKS). The
same files ship on npm as @codelaw/rules-js and on PyPI as codelaw-rules-js.
# codelaw.toml
extends = ["codelaw:js/recommended"]
preview = true # every rule is `preview` until a corpus run promotes it
Presets
| preset | rules | ported from |
|---|---|---|
js/recommended |
66 | ESLint js.configs.recommended, @eslint/js 10.0.1 — all 64 rules — plus js/no-console at warn, which ESLint leaves out, and js/use-instead at warn, inert until replacements is set (W-73); a team turns it to error in [profiles.ci] |
js/typescript |
4 | the four core rules typescript-eslint 8.71.2's eslint-recommended switches on for TypeScript: js/no-var, js/prefer-const, js/prefer-rest-params, js/prefer-spread; use it with codelaw:ts/recommended |
js/conventions |
3 | codelaw's starter catalogue: js/exports-at-end, js/import-groups, js/no-default-export — opt in |
js/project |
1 | graph/no-unused-exports, the rule that reads the whole repo, from knip's exports and types — opt in |
js/size |
5 | size limits at warn, with ESLint's defaults: js/max-lines (300 per file), js/max-lines-per-function (50) and js/max-params (3) — opt in |
js/markers |
3 | TODO comments with a ticket (and a date when asked), no focused tests, skipped tests with a reason and an expiry; opt in (SR-CONFIG decision 11a) |
Rules that typescript-eslint's eslint-recommended switches off for TypeScript
(no-undef, no-redeclare, no-dupe-class-members and the rest, which the
compiler checks) declare only javascript and jsx here. The four rules in
js/typescript declare all four languages, so they also run on JavaScript
files when that preset is on.
Every rule is reimplemented, not vendored: the matchers, messages and docs
are written fresh, and each rule's ported_from: names the source rule.
How the ports differ
Every rule matches its source's documented behaviour on the source's own
examples. Where codelaw differs, the rule's ## Differences from the source
section says so. The larger ones:
| rule | difference |
|---|---|
js/constructor-super, js/no-this-before-super |
follow the constructor's statements in straight-line order; a super() on any branch counts |
js/no-constant-condition |
literal conditions only; ESLint also folds typeof x, !1 and similar |
js/no-extra-boolean-cast |
!!x in a condition; Boolean(x) in a condition is not checked yet |
js/no-invalid-regexp |
structural problems only (brackets, groups, quantifiers, flags) |
js/no-useless-assignment |
dead stores a straight-line reading proves; ESLint follows every code path |
js/no-useless-escape |
strings and templates; escapes inside regular expressions are not checked yet |
js/no-undef |
environments come from the env option (shared-node-browser by default), using the globals data tables |
js/prefer-spread |
only f.apply(null, args) on a plain function name |
js/no-var |
suggest, not auto: let is block-scoped, so the swap can change meaning |
Nothing from js.configs.recommended is left out.
Data
data/globals/*.json — the globals of each environment js/no-undef's env
option names, from the globals package 17.13.0 (MIT). See NOTICE.
1 maintainer
Metadata
1 maintainer
Release files for codelaw-rules-js 0.4.2
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