ts-data-forge
Version:
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JavaScript
/**
* Type guard that checks if a value is a non-null object.
*
* This function checks if a value has type `"object"` according to the `typeof`
* operator and is not `null`. This includes all object types such as plain
* objects, arrays, dates, regular expressions, and other object instances, but
* excludes functions.
*
* **Type Narrowing Behavior:**
*
* - Narrows `unknown` to `object`
* - Excludes `null`, `undefined`, and all primitive types
* - Excludes functions (they have `typeof` === `"function"`, not `"object"`)
* - Includes arrays, dates, regex, and other object instances
*
* **Note:** This function returns `true` for arrays. If you need to check for
* plain objects specifically (excluding arrays), use `isRecord()` instead.
*
* @example
*
* ```ts
* const mixed: unknown[] = [{ id: 1 }, null, 'Ada'] as const;
*
* const objects = mixed.filter(isNonNullObject);
*
* assert.deepStrictEqual(objects, [{ id: 1 }]);
* ```
*
* @param u - The value to check
* @returns `true` if `u` is an object and not `null`, `false` otherwise. When
* `true`, TypeScript narrows the type to `object`.
* @see {@link isRecord} - For checking plain objects specifically (excludes arrays)
*/
// eslint-disable-next-line @typescript-eslint/no-restricted-types
const isNonNullObject = (u) => typeof u === 'object' && u !== null;
export { isNonNullObject };
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