requireNonEmpty

function requireNonEmpty<T>(
  value: T,
  message: string = "Expected a non-empty value.",
  strict: boolean = false
): T;

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`	`T`	The value to validate.
`message` (optional) `= "Expected a non-empty value."`	`string`	The message of the exception. A default is used when omitted.
`strict` (optional) `= false`	`boolean`	When `true`, a string counts as empty only if it has no characters at all; by default whitespace is trimmed first.

Returns

T — the same value, with empty excluded from its type.

Throws

Exception	Condition
`IllegalArgumentException`	the value is empty.

Examples

What passes and what does not

requireNonEmpty(0); // => 0
requireNonEmpty(false); // => false
requireNonEmpty(null); // throws IllegalArgumentException
requireNonEmpty(""); // throws IllegalArgumentException

Source

src/lang/base/requireNonEmpty.ts

23 September 2026

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

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