# Changelog

All notable changes to this project will be documented in this file.

## [3.0.0] - 2026-02-08

### Added
- **Performance**: Implemented "Extreme Performance" refactoring.
    - Added `axiosClient` with `keepAlive` (reusing TCP connections) and Gzip compression.
    - Implemented `p-limit` for parallel processing in `extractAlbum` (defaults to 5 concurrent requests).
- **Testing**: Added **Vitest** testing framework.
    - Created unit tests for `getPhotos`, `getAlbum`, and `extractAlbum`.
    - Added `npm test` and `npm run test:watch` scripts.
- **Linting & Formatting**: Migrated to **Biome**.
    - Replaced `eslint` and `prettier` with `@biomejs/biome` for faster and unified linting/formatting.
    - Added `npm run lint`, `npm run lint:fix`, and `npm run format` scripts.

### Changed
- **Core Logic**:
    - **`getAlbum.ts`**: Replaced `cheerio` with **Regex** for metadata extraction (Canonical URL and Key), significantly reducing memory usage and parsing time.
    - **`getPhotos.ts`**: Optimized RPC response parsing with defensive error handling and `URLSearchParams` for efficient body construction.
    - **`extractAlbum.ts`**: Now uses a `Map` for O(1) ID lookups and sorts output by `createdAt` descending.
- **Dependencies**:
    - Updated `axios`, `commander`, `mime-types`.
    - Removed `cheerio` (bloat removal).
    - Removed `eslint`, `globals`, `@eslint/js`, `typescript-eslint`.
- **Configuration**:
    - Updated `tsconfig.json` to strict mode.
    - Added `biome.json` and `vitest.config.ts`.

### Fixed
- Fixed an issue where `getPhotos` might return duplicate items or fail on malformed RPC responses.
- Fixed `getAlbum` to reliably extract the album key even when not present in the URL query parameters.