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Ivanov","email":"iweb.ivanov@gmail.com","url":"https://github.com/pivanov"},"license":"MIT","homepage":"https://github.com/pivanov/pivanov-utils#readme","keywords":["utils","typescript","react","dom","cache","browser cache api","event-bus","string","object","promise"],"repository":{"type":"git","url":"git://github.com/pivanov/pivanov-utils.git"},"description":"A focused collection of TypeScript utilities for modern web development","maintainers":[{"name":"pivanov","email":"pafelka@gmail.com"}],"readme":"# @pivanov/utils\n\n

\n A focused collection of TypeScript utilities for modern web development.\n

\n \"NPM\n  \n \"Weekly\n  \n \"CI\n  \n \"Coverage\n

\n\n## Features\n\n- **Fully typed** - strict TypeScript across every module, literal-type preserving where it matters\n- **Tree-shakeable** - ESM + CJS + per-module subpath exports, `\"sideEffects\": false`\n- **Zero dependencies** - React is an optional peer dep only for the `useEventBus` hook\n- **Well tested** - 200+ tests, real edge cases (circular refs, typed arrays, Buffers, symbols)\n\n## Installation\n\n```bash\nbun add @pivanov/utils\n```\n\n```bash\nnpm install @pivanov/utils\n```\n\n```bash\nyarn add @pivanov/utils\n```\n\n```bash\npnpm add @pivanov/utils\n```\n\n## Quick start\n\n```ts\nimport { camelCase, snakeCase, slugify } from '@pivanov/utils/string';\nimport { pick, groupBy, deepMerge } from '@pivanov/utils/object';\nimport { isString, isNil, isDefined } from '@pivanov/utils/assertion';\nimport { sleep, timeout, retry, parallelLimit } from '@pivanov/utils/promise';\nimport { deepClone, isEqual, busDispatch, useEventBus } from '@pivanov/utils/tools';\n```\n\n## What's inside\n\n| Module | Surface |\n|---|---|\n| `assertion` | `isString`, `isNumber`, `isBoolean`, `isFunction`, `isObject`, `isRecord`, `isNull`, `isUndefined`, `isNil`, `isDefined`, `isArray`, `isDate`, `isRegExp`, `isError`, `isPromise`, `isMap`, `isSet`, `isPrimitive`, `isEmpty` |\n| `object` | `pick`, `omit`, `pickBy`, `omitBy`, `merge`, `deepMerge`, `mapValues`, `mapKeys`, `groupBy`, `invert`, `hasOwn`, `keysOf`, `entriesOf`, `fromEntries` |\n| `promise` | `sleep`, `timeout`, `retry`, `defer`, `parallelLimit` - all AbortSignal-aware where relevant |\n| `string` | `camelCase`, `pascalCase`, `kebabCase`, `snakeCase`, `titleCase`, `slugify`, `capitalize`, `uncapitalize`, `capitalizeFirstLetter`, `truncate`, `escapeHtml`, `escapeRegExp`, `words`, `lines` |\n| `tools/deepClone` | Rich deep clone (prototypes, getters/setters, symbols, Buffers, TypedArrays, circular refs) |\n| `tools/isEqual` | Deep equality with cycle detection; compares RegExp, Error, TypedArrays, ArrayBuffer |\n| `tools/dom` | `isBrowser`, `checkVisibility`, `isInViewport`, `setStyleProperties`, `calculateRenderedTextWidth` |\n| `cache` | Cache Storage helpers: JSON metadata with optional TTL, plus raw `Request`/`Response` caching. Shipped as a standalone `@pivanov/utils/cache` entry point |\n| `tools/eventBus` | `busDispatch`, `busSubscribe`, `busOnce`, `useEventBus` - typed topics, optional error handler |\n| `types` | `TDict`, `TObjType`, `DeepPartial`, `DeepReadonly`, `Mutable`, `Prettify` |\n\nSee the full **[API documentation](https://pivanov.github.io/pivanov-utils/)**.\n\n## Tree shaking\n\nSubpath imports give the smallest bundles:\n\n```ts\nimport { camelCase } from '@pivanov/utils/string';\nimport { deepClone } from '@pivanov/utils/tools';\n```\n\nTop-level imports tree-shake fine in modern bundlers:\n\n```ts\nimport { camelCase, deepClone } from '@pivanov/utils';\n```\n\n## A few highlights\n\n### Async that cancels\n\n```ts\nimport { sleep, timeout, retry } from '@pivanov/utils/promise';\n\nconst ctrl = new AbortController();\nawait sleep(1000, ctrl.signal); // cancellable\nawait timeout(fetch('/slow'), 3000); // race with timer\nawait retry(() => fetch('/api'), { attempts: 5, backoff: (n) => 100 * 2 ** n });\n```\n\n### Typed event bus\n\n```ts\nimport { busDispatch, useEventBus, type IEventBus } from '@pivanov/utils/tools';\n\ninterface UserLoggedIn extends IEventBus<{ id: number; name: string }> {\n topic: 'user:logged-in';\n}\n\nuseEventBus('user:logged-in', (user) => console.log(user.name));\nbusDispatch('user:logged-in', { id: 1, name: 'Ada' });\n```\n\nSee the [Typed Events guide](https://pivanov.github.io/pivanov-utils/guides/typed-events) for an event-map pattern at scale.\n\n### Cache with TTL\n\n```ts\nimport {\n storageSetItemWithTTL,\n storageGetItemWithTTL,\n} from '@pivanov/utils/cache';\n\nawait storageSetItemWithTTL('app', 'token', 'abc123', 10 * 60 * 1000);\n\nconst token = await storageGetItemWithTTL('app', 'token');\n// null if missing or expired; expired entries are deleted on read\n```\n\n### Raw response caching in a service worker\n\n`@pivanov/utils/cache` is built as its own bundle with no React, no event bus and\nno DOM helpers, so a service worker can import it without dragging the rest of\nthe package in. Alongside the JSON helpers it exposes a raw layer that stores a\n`Response` byte for byte, preserving body, status and headers.\n\n```ts\nimport {\n cacheDelete,\n cacheMatchResponse,\n cacheNames,\n cachePutResponse,\n} from '@pivanov/utils/cache';\n\nconst CACHE = 'assets-v3';\n\nself.addEventListener('fetch', (event: FetchEvent) => {\n event.respondWith((async () => {\n const hit = await cacheMatchResponse(CACHE, event.request);\n if (hit) {\n return hit;\n }\n\n const response = await fetch(event.request);\n await cachePutResponse(CACHE, event.request, response); // caches a clone\n return response; // still readable\n })());\n});\n\n// Revision cleanup\nconst outdated = (await cacheNames()).filter((name) => name !== CACHE);\nawait Promise.all(outdated.map(cacheDelete));\n```\n\n### Deep clone that actually preserves shape\n\n```ts\nimport { deepClone } from '@pivanov/utils/tools';\n\nclass User {\n constructor(public name: string) {}\n greet() { return `hi ${this.name}`; }\n}\n\nconst clone = deepClone(new User('Ada'));\nclone instanceof User; // true\nclone.greet(); // 'hi Ada'\n```\n\n## Compatibility\n\n- Modern browsers (ES2022)\n- Bun, Node 18+ (ESM or CJS)\n- Cache API requires browser support (Chrome 40+, Firefox 41+, Safari 11.1+)\n- React hook requires React 18+\n\n## Development\n\n```bash\nbun install\nbun test # run tests\nbun run test:coverage # with coverage (lcov)\nbun run typecheck\nbun run lint\nbun run build # ESM + CJS + .d.ts\nbun run docs:dev # run VitePress docs site locally\n```\n\n## Sponsors\n\nSupported by [LogicStar AI](https://logicstar.ai/)\n\n## License\n\nMIT © [Pavel Ivanov](https://github.com/pivanov)\n","readmeFilename":"README.md"}