Cleaner separation of concerns:
- options.typeAware: true in .oxlintrc.json activates type-aware
rules declaratively (equivalent to --type-aware CLI flag, but
the script command stays clean: just 'oxlint ...')
- Remove the 3 type-aware rule disables from .oxlintrc.json
- Add source-level oxlint-disable directives instead:
- 4x typescript/no-unsafe-type-assertion (pattern.ts: keysMatch
Object.keys() cast, candidate[] cast; structuralMatcher value
as S cast; match.ts: handler as ... cast in nextCases)
- 1x typescript/no-unnecessary-type-parameters (pattern.ts:
keysMatch <S extends object>)
- 1x file-level typescript/no-floating-promises in index.test.ts
(expectTypeOf() is a sync type-assertion library that the
type-aware linter misidentifies)
Disabling rules at the source (next to the line that needs the
exemption) documents intent more clearly than a global config
override, and makes the trade-off visible to anyone reading the
code. Re-enabling a rule in the future only requires removing the
inline comment, not editing a central config.
Introduce the core builder and pattern constructors:
- match(value): chain .with(pattern, handler) and terminate with
.exhaustive() (throws on no match) or .otherwise(handler).
- P.literal, P.type, P.when, P.any, P.shape for pattern construction.
- Each pattern is a Matcher<T> whose matches acts as a type guard, so
handler parameters are narrowed to the matched type.
The MatchBuilder accumulates handlers and returns a new builder per
.with() call (immutable chaining); finalization runs the cases in order
and returns the first match's handler result.
TypeScript configuration relaxed in .oxlintrc.json:
- Disable eslint/no-undefined (we use undefined as the no-match sentinel)
- Disable eslint/sort-keys (handler order matters; alphabetical would
be wrong)
- Disable eslint/id-length (T/R/U/V generics are standard TS convention)
- Disable import/no-named-export (false positive for library entry points)
Verified:
- tsc --noEmit passes with strict + noUncheckedIndexedAccess
- tsc -p tsconfig.build.json emits dist/*.js + .d.ts + sourcemaps
- node -e "import('./dist/index.js')" loads and exposes { match, P }
tmu