@dephub/is 🧩

Lightweight runtime type guards for JavaScript & TypeScript

Features ✨

• 🛡️ Primitives: string, number, boolean, bigint, symbol, undefined, null, NaN
• 🔹 Advanced types: array, object, function, map, set, promise, error, date, regexp, response
• ⚡ Utilities: isEmpty, isTruthy, isFalsy, isPrimitive
• 🔄 Fully TypeScript safe with type predicates for narrowing

Installation 📦

# npm
npm install @dephub/is

# pnpm
pnpm add @dephub/is

# yarn
yarn add @dephub/is

# bun
bun add @dephub/is

Usage 🎯

import {
  // Primitives
  isString,
  isNumber,
  isBoolean,
  isBigInt,
  isSymbol,
  isUndefined,
  isNull,
  isNaN,

  // Advanced
  isArray,
  isObject,
  isFunction,
  isMap,
  isSet,
  isPromise,
  isError,
  isDate,
  isRegExp,
  isResponse,

  // Utilities
  isEmpty,
  isTruthy,
  isFalsy,
  isPrimitive,

  // Type helper
  typeOf,
} from '@dephub/is';

// Primitives
isString('hello'); // true
isNumber(42); // true
isBoolean(false); // true

// Objects & collections
isArray([1, 2, 3]); // true
isObject({ a: 1 }); // true
isMap(new Map()); // true
isSet(new Set()); // true

// Functions & errors
isFunction(() => {}); // true
isError(new Error('oops')); // true

// Special objects
isDate(new Date()); // true
isRegExp(/abc/); // true
isResponse(new Response()); // true

// Async
isPromise(Promise.resolve()); // true

// Utilities
isEmpty([]); // true
isTruthy('value'); // true
isFalsy(0); // true
isPrimitive(42); // true

// Type check helper
typeOf(null); // 'null'
typeOf([1, 2, 3]); // 'array'
typeOf(Promise.resolve()); // 'promise'

License 📄

MIT License – see LICENSE for details.

Author: Estarlin R (estarlincito.com)