requireNonObjectLike

function requireNonObjectLike<T>(
  value: T | object,
  message: string = "Expected a non-object value."
): T;

Everything isObject accepts, plus functions: the question it answers is whether properties can be read off the value at all.

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 \\| object`	The value to validate.
`message` (optional) `= "Expected a non-object value."`	`string`	The message of the exception. A default is used when omitted.

Returns

T — the same value, with object-like excluded from its type.

Throws

Exception	Condition
`IllegalArgumentException`	the value is object-like.

Examples

What passes and what does not

requireNonObjectLike(null); // => null
requireNonObjectLike("abc"); // => "abc"
requireNonObjectLike({}); // throws IllegalArgumentException
requireNonObjectLike([]); // throws IllegalArgumentException

Source

src/lang/base/requireNonObjectLike.ts

23 September 2026

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

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