isEmpty

function isEmpty(value: unknown, strict: boolean = false): boolean;

Emptiness is read per kind: null and undefined, a string with nothing but whitespace, an array, Set or Map with no entries, an object with no own keys. 0 and false are values, not emptiness.

isX and nonX answer a question and never interrupt control flow; requireX and requireNonX hand the value back or throw. The scheme is explained in Validation conventions.

Parameters

Parameter	Type	Description
`value`	`unknown`	The value to check.
`strict` (optional) `= false`	`boolean`	The strictness mode for string validation. - If `false` (default), strings containing only whitespace characters (spaces, tabs, newlines) are considered empty (using `trim()`). This is known as "blank" check. - If `true`, only a string with zero length (`""`) is considered empty.

Returns

boolean — true when the value is empty; otherwise false.

Examples

What passes and what does not

isEmpty(null); // => true
isEmpty(""); // => true
isEmpty("   "); // => true
isEmpty([]); // => true
isEmpty({}); // => true
isEmpty(new Map()); // => true
isEmpty(0); // => false
isEmpty(false); // => false
isEmpty("a"); // => false
isEmpty([0]); // => false

Source

src/lang/base/isEmpty.ts

23 September 2026

This documentation was generated with AI (Claude) from the library's source code.

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