An educational pure functional programming library in TypeScript
Release v0.1.0-alpha.14
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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.14] - 2026-04-03
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### Fixed
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- **Bracket resource leak on fiber interruption** — release handlers now run when a fiber is interrupted during async `use` phase, preventing resource leaks
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- **Unsafe `toResult` non-null assertion** — `invalid()` now requires at least one error (`readonly [E, ...E[]]`), eliminating the `errors[0]!` assertion that could produce `undefined`
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- **`matchValidation` error type** — `onInvalid` callback now receives `readonly [E, ...E[]]` matching the `Invalid` type
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### Removed
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- **Duplicate `eachTraversal`** from bridges module — use `each()` from the traversal module instead
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### Added
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- **35 new tests** (414 total)
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- Bracket + fiber interruption tests verifying release runs and exit is `Interrupted`
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- `yieldNow` and `fiberId` test coverage
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- 8 additional optics `compose` overload tests (prism+lens, prism+prism, lens+optional, optional+lens, optional+optional, lens+traversal, traversal+lens, prism+optional)
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- Optional algebraic law tests (getOption-set, set-getOption)
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- Traversal algebraic law tests (identity, composition)
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## [0.1.0-alpha.13] - 2026-03-19
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### Added
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- **Optional** — focus that may be absent (`getOption`, `setOptional`, `modifyOptional`, `index`)
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- **Traversal** — focus on many values (`getAll`, `modifyTraversal`, `each`)
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- **Type-safe `compose`** — 16 overloads enforcing composition rules (Lens+Lens=Lens, Lens+Prism=Optional, etc.)
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- **Bridges** — pre-built optics for Result (`okPrism`, `errPrism`), Option (`somePrism`), Validation (`validPrism`), arrays (`eachTraversal`)
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- **Bridges** — pre-built optics for Result (`okPrism`, `errPrism`), Option (`somePrism`), Validation (`validPrism`)
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- **44 law-based tests** verifying get-set, set-get, set-set, preview-review, and review-preview laws
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## [0.1.0-alpha.12] - 2026-02-28