An educational pure functional programming library in TypeScript
Release v0.1.0-alpha.12
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CHANGELOG.md
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CHANGELOG.md
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All notable changes to this project will be documented in this file.
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## [0.1.0-alpha.12] - 2026-02-28
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### Fixed
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- **`ifElse` inverted arguments** — `onTrue` was called when predicate was false and vice versa; swapped parameter order and ternary to match naming
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- **`matchLiteral` soundness gap** — Split into exhaustive `matchLiteral` (requires all cases) and partial `matchLiteralOr` (with default fallback)
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- **Fiber interrupt doesn't cancel async** — Interrupt now calls cleanup on in-flight async operations and force-resolves blocked promises
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- **`zip` fiber leak** — When the second effect fails, the first fiber is now interrupted instead of being abandoned
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- **`traverseResult` unnecessary cast** — Removed redundant `as unknown as` double-cast; TypeScript narrows correctly
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- **Generic guards missing type predicates** — Added explicit `: x is T` annotations to `isDefined`, `isNotNull`, `isNotNullish` (TS 5.5 inference doesn't apply to generics)
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- **Interpreter null assertion** — Replaced `result!` with null guard in Blocked handler's next thunk
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- **Documentation: `race()` array syntax** — Fixed `race([fast, slow])` to `race(fast, slow)` in testing strategies
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- **Documentation: timeout test** — Fixed test to expect `Success(null)` instead of `Failure` on timeout
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- **Documentation: `yield*` pseudo-code** — Replaced generator syntax with actual `pipe`/`flatMap` in fiber example
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- **Documentation: `all()` return type** — Corrected type comment from tuple to union array
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- **Documentation: dead link** — Fixed `/concepts/01-branded-types-and-refinements/` to `/concepts/02-branded-types/`
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- **Examples: comma-expression patterns** — Replaced `(sideEffect, expr)` with explicit block bodies in http-client and task-queue
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- **Examples: redundant `as` casts** — Removed unnecessary `as MessageError` casts in forest-election story
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- **Documentation: task-queue key concepts** — Updated from `fork`/`join` to `allSequential`/`timeout`/`retry`
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- **Documentation: unused imports** — Removed unused `fork`/`join` from forest-election story
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### Added
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- **39 new tests** (261 → 300 total) covering: `ifElse`, `matchLiteral`, `matchLiteralOr`, `mapErr`, `isOk`/`isErr`, `toNullable`, `flatMapOption` edge cases, `accessEff`, `tapEff`, `repeatEff`, `interruptFiber`, `matchExit`, `liftA2Option` both-None, Option Functor laws, Option Monad laws
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## [0.1.0-alpha.11] - 2026-02-28
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### Added