@zerodep/is-null

A simple, performant utility to determine if a value is null.

Full documentation is available at the zerodep.app page.

Signature

declare const isNull: (value: unknown) => boolean;

Examples

All @zerodep packages support both ESM and CJS formats, each complete with Typescript typings.

// ESM
import { isNull } from '@zerodep/is-null';

// CJS
const { isNull } = require('@zerodep/is-null');

// Arrays
isNull([]); // false
isNull([1, 2, 3]); // false
isNull(['a', 'b', 'c']); // false

// BigInts
isNull(42n); // false
isNull(0n); // false
isNull(-0n); // false
isNull(-42n); // false

// Booleans
isNull(true); // false
isNull(false); // false

// Class
isNull(
  class SomeClass {
    constructor() {}
  }
); // false

// Dates
isNull(new Date()); // false
isNull(new Date('1970-01-01T12:00:00.000Z')); // false
isNull(new Date('2099-12-31')); // false

// Empty
isNull(null); // true
isNull(undefined); // false

// Errors
isNull(new Error('message')); // false
isNull(new AggregateError([new Error('err1'), new Error('err2')], 'message')); // false

// Floats
isNull(3.14); // false
isNull(0.0); // false
isNull(-0.0); // false
isNull(-3.14); // false
isNull(Math.E); // false
isNull(Math.PI); // false
isNull(Number.MIN_VALUE); // false

// Functions
isNull(() => 'function'); // false
isNull(async () => 'function'); // false

// Generators
isNull(function* () {
  yield 'a';
}); // false
isNull(async function* () {
  yield 'a';
}); // false

// Maps
isNull(new Map()); // false
isNull(new Map([['key1', 123]])); // false
isNull(new Map([['key1', 'value1']])); // false

// Numbers
isNull(Number.POSITIVE_INFINITY); // false
isNull(Number.MAX_SAFE_INTEGER); // false
isNull(3e8); // false
isNull(42); // false
isNull(1); // false
isNull(0); // false
isNull(-0); // false
isNull(-1); // false
isNull(-42); // false
isNull(-3e8); // false
isNull(Number.MIN_SAFE_INTEGER); // false
isNull(Number.NEGATIVE_INFINITY); // false
isNull(Number.NaN); // false

// POJOs
isNull({}); // false
isNull({ key: 'string' }); // false
isNull({ key: 123 }); // false

// Promise
isNull(new Promise(() => {})); // false
isNull(new Promise.all([])); // false
isNull(new Promise.allSettled([])); // false
isNull(new Promise.race([])); // false
isNull(Promise.resolve()); // false

// Regular Expression
isNull(/[regex]+/gi); // false
isNull(new RegExp('d', 'gi')); // false

// Sets
isNull(new Set()); // false
isNull(new Set([1, 2, 3])); // false
isNull(new Set(['a', 'b', 'c'])); // false

// Strings
isNull(''); // false
isNull('a longer string'); // false
isNull('1000n'); // false
isNull('3e8'); // false
isNull('42'); // false
isNull('3.14'); // false
isNull('0'); // false
isNull('-0'); // false
isNull('-3.14'); // false
isNull('-42'); // false
isNull('-3e8'); // false
isNull('-1000n'); // false

// Symbols
isNull(Symbol()); // false
isNull(Symbol('name')); // false

// This
isNull(this); // false
isNull(globalThis); // false

// TypedArrays
isNull(new Int8Array(2)); // false
isNull(new Int16Array(2)); // false
isNull(new Int32Array(2)); // false
isNull(new Uint8Array(2)); // false
isNull(new Uint16Array(2)); // false
isNull(new Uint32Array(2)); // false
isNull(new Uint8ClampedArray(2)); // false

isNull(new BigInt64Array(2)); // false
isNull(new BigUint64Array(2)); // false

isNull(new Float32Array(2)); // false
isNull(new Float64Array(2)); // false

isNull(new SharedArrayBuffer(512)); // false

// WeakMap and WeakSet
isNull(new WeakMap()); // false
isNull(new WeakSet()); // false

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ZeroDep Advantages

• Zero npm dependencies - completely eliminates all risk of supply-chain attacks, decreases node_modules folder size
• ESM & CJS - has both ecmascript modules and common javascript exports
• Tree Shakable - built to be fully tree shakable ensuring your packages are the smallest possible size
• Fully typed - typescript definitions are provided for every package for a better developer experience
• Semantically named - package and method names are easy to grok, remember, use, and read
• Documented - actually useful documentation with examples at zerodep.app
• Intelligently Packaged - multiple npm packages of different sizes available allowing a menu or a-la-carte composition of capabilities
• 100% Tested - all methods and packages are fully unit tested
• Predictably Versioned - semantically versioned for peace-of-mind upgrading, this includes changelogs
• MIT Licensed - permissively licensed for maximum usability