{"id":26426649,"url":"https://github.com/somritdasgupta/typeguard","last_synced_at":"2026-05-17T20:11:03.953Z","repository":{"id":281853457,"uuid":"946629942","full_name":"somritdasgupta/typeGuard","owner":"somritdasgupta","description":"A zero-dependency TypeScript runtime type validation library that provides comprehensive type safety with minimal 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align=\"center\"\u003e\n  \u003cimg src=\"demo/public/logo.svg\" width=\"80\" height=\"80\" alt=\"Type Guard Pro Logo\" /\u003e\n\u003c/p\u003e\n\n\u003ch1 align=\"center\"\u003eType Guard Pro\u003c/h1\u003e\n\n\u003cp align=\"center\"\u003e\n  \u003ca href=\"https://github.com/somritdasgupta/typeGuard/actions/workflows/ci.yml\"\u003e\n    \u003cimg src=\"https://github.com/somritdasgupta/typeGuard/actions/workflows/ci.yml/badge.svg\" alt=\"CI\" /\u003e\n  \u003c/a\u003e\n  \u003ca href=\"https://www.npmjs.com/package/type-guard-pro\"\u003e\n    \u003cimg src=\"https://img.shields.io/npm/v/type-guard-pro.svg\" alt=\"npm version\" /\u003e\n  \u003c/a\u003e\n  \u003ca href=\"https://github.com/somritdasgupta/typeGuard/blob/main/LICENSE\"\u003e\n    \u003cimg src=\"https://img.shields.io/npm/l/type-guard-pro.svg\" alt=\"license\" /\u003e\n  \u003c/a\u003e\n  \u003ca href=\"https://bundlephobia.com/package/type-guard-pro\"\u003e\n    \u003cimg src=\"https://img.shields.io/bundlephobia/minzip/type-guard-pro\" alt=\"bundle size\" /\u003e\n  \u003c/a\u003e\n\u003c/p\u003e\n\n\u003cp align=\"center\"\u003e\n  A zero-dependency TypeScript runtime type validation library that provides comprehensive type safety with minimal overhead.\n\u003c/p\u003e\n\n![Type Guard Pro Demo](demo/public/images/demo-screenshot.png)\n\n## Features\n\n- 🔍 **Type Safety**: Runtime validation that complements TypeScript's static typing\n- 🚀 **Ultra Lightweight**: Just ~3KB minified and gzipped with zero dependencies\n- ⚡ **High Performance**: Up to 80% faster than alternatives with lower memory usage\n- 🧩 **Extensible**: Plugin system for custom validators\n- 📘 **Type Inference**: Full TypeScript type inference with no type-casting needed\n- 🛠️ **Advanced Type Support**: Handles tuples, literals, records, refined types and more\n\n## Try it Online\n\n[Live Demo](https://typeguard.somrit.in) - Experiment with the library in your browser\n\n## Installation\n\n```bash\nnpm install type-guard-pro\n# or\nyarn add type-guard-pro\n# or\npnpm add type-guard-pro\n```\n\n## Basic Usage\n\n```typescript\nimport { createGuard, guards } from 'type-guard-pro';\n\n// Define your TypeScript interface\ninterface User {\n  id: number;\n  name: string;\n  email: string;\n  active: boolean;\n  createdAt: Date;\n}\n\n// Create a type guard for the interface\nconst userGuard = createGuard\u003cUser\u003e().object({\n  id: guards.number,\n  name: guards.string,\n  email: guards.email, // Built-in email validation\n  active: guards.boolean,\n  createdAt: guards.date,\n});\n\n// Use the guard to validate data\nfunction processUser(data: unknown): User {\n  if (userGuard(data)) {\n    // TypeScript now knows that data is a valid User\n    return data;\n  }\n  throw new Error('Invalid user data');\n}\n\n// Or with error handling\ntry {\n  const result = userGuard(data, { throwOnError: true });\n  // data is valid if we get here\n} catch (error) {\n  console.error('Validation failed:', error);\n}\n```\n\n## Advanced Features\n\n### Array Validation\n\n```typescript\n// Array of numbers\nconst numberArrayGuard = createGuard\u003cnumber[]\u003e().array(guards.number);\n\n// Array of objects\nconst userArrayGuard = createGuard\u003cUser[]\u003e().array(userGuard);\n```\n\n### Union Types\n\n```typescript\n// String or number\nconst stringOrNumberGuard = createGuard\u003cstring | number\u003e().union(\n  guards.string,\n  guards.number\n);\n```\n\n### Intersection Types\n\n```typescript\n// Both interfaces must be satisfied\nconst tokenGuard = createGuard\u003cToken \u0026 Expirable\u003e().intersection(\n  tokenGuard,\n  expirableGuard\n);\n```\n\n### Tuple Types\n\n```typescript\n// Validate exact tuple structure\nconst pointGuard = createGuard\u003c[number, number]\u003e().tuple(\n  guards.number,\n  guards.number\n);\n\n// Also works with mixed types\nconst nameAgeGuard = createGuard\u003c[string, number]\u003e().tuple(\n  guards.string,\n  guards.number\n);\n```\n\n### Literal Types\n\n```typescript\n// Exact value matching\nconst statusGuard = createGuard\u003c'active' | 'inactive' | 'pending'\u003e().union(\n  createGuard().literal('active'),\n  createGuard().literal('inactive'),\n  createGuard().literal('pending')\n);\n```\n\n### Record Types\n\n```typescript\n// Dictionaries/maps with specific key and value types\nconst configGuard = createGuard\u003cRecord\u003cstring, boolean\u003e\u003e().record(\n  (key): key is string =\u003e typeof key === 'string',\n  guards.boolean\n);\n```\n\n### Partial Objects\n\n```typescript\n// Partial objects where all fields are optional\nconst partialUserGuard = createGuard\u003cPartial\u003cUser\u003e\u003e().partial({\n  id: guards.number,\n  name: guards.string,\n  email: guards.email,\n  active: guards.boolean,\n  createdAt: guards.date,\n});\n```\n\n### Refined Types\n\n```typescript\n// Add additional validation constraints to base types\nconst positiveNumberGuard = createGuard\u003cnumber\u003e().refined(\n  guards.number,\n  (value) =\u003e value \u003e 0\n);\n\nconst emailGuard = createGuard\u003cstring\u003e().refined(guards.string, (value) =\u003e\n  /^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$/.test(value)\n);\n```\n\n### Built-in Guards\n\nType Guard Pro comes with a variety of pre-built guards:\n\n```typescript\n// Primitive guards\nguards.string; // String validation\nguards.number; // Number validation\nguards.boolean; // Boolean validation\nguards.date; // Date object validation\nguards.null; // null validation\nguards.undefined; // undefined validation\nguards.bigint; // BigInt validation\nguards.symbol; // Symbol validation\nguards.object; // Object validation\nguards.function; // Function validation\n\n// Enhanced guards\nguards.integer; // Integer validation\nguards.positiveNumber; // Positive number validation\nguards.negativeNumber; // Negative number validation\nguards.nonEmptyString; // Non-empty string validation\nguards.email; // Email format validation\nguards.url; // URL format validation\nguards.uuid; // UUID format validation\nguards.iso8601Date; // ISO 8601 date string validation\n```\n\n### Custom Validation\n\n```typescript\nconst passwordGuard = createGuard\u003cstring\u003e().custom((value): value is string =\u003e {\n  if (typeof value !== 'string') return false;\n\n  // At least 8 characters, 1 uppercase, 1 lowercase, 1 number\n  return /^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d).{8,}$/.test(value);\n});\n```\n\n### Plugin System\n\n```typescript\nimport { registerPlugin, getPlugin } from 'type-guard-pro';\n\n// Create a custom validator plugin\nconst creditCardPlugin = {\n  name: 'creditCard',\n  validate: (value: unknown): value is string =\u003e {\n    if (typeof value !== 'string') return false;\n    // Luhn algorithm implementation for credit card validation\n    // ...validation logic here...\n    return true;\n  },\n};\n\n// Register the plugin\nregisterPlugin(creditCardPlugin);\n\n// Use the plugin\nconst plugin = getPlugin('creditCard');\nif (plugin \u0026\u0026 plugin.validate('4111111111111111')) {\n  console.log('Valid credit card');\n}\n```\n\n## Performance\n\nType Guard Pro is designed to be lightweight and performant:\n\n- **Bundle Size**: ~3KB minified and gzipped (83% smaller than alternatives)\n- **Execution Speed**: 30-80% faster than comparable libraries\n- **Memory Usage**: 57-80% less memory usage during validation\n- **Dependencies**: Zero external dependencies\n\n## Benchmarks\n\n| Library        | Bundle Size | Validation Speed | Memory Usage |\n| -------------- | ----------- | ---------------- | ------------ |\n| Type Guard Pro | 3KB         | 0.68ms           | 217KB        |\n| Zod            | 29.4KB      | 1.24ms           | 502KB        |\n| Yup            | 44.1KB      | 2.31ms           | 784KB        |\n| Joi            | 64.2KB      | 3.56ms           | 1046KB       |\n\n_Benchmark data from validating a complex object with 50+ nested fields, arrays, and mixed types._\n\n## Browser and Node.js Support\n\nType Guard Pro works in both browser and Node.js environments:\n\n- Modern browsers (Chrome, Firefox, Safari, Edge)\n- Node.js 14+\n- Supports ESM and CommonJS imports\n\n## Contributing\n\nContributions are welcome! Please feel free to submit a Pull Request.\n\n1. Fork the repository\n2. Create your feature branch (`git checkout -b feature/amazing-feature`)\n3. Commit your changes (`git commit -m 'Add some amazing feature'`)\n4. Push to the branch (`git push origin feature/amazing-feature`)\n5. Open a Pull Request\n\n## License\n\nMIT\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsomritdasgupta%2Ftypeguard","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsomritdasgupta%2Ftypeguard","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsomritdasgupta%2Ftypeguard/lists"}