23 lines
No EOL
832 B
TypeScript
23 lines
No EOL
832 B
TypeScript
//#region src/compat/predicate/isNil.d.ts
|
|
/**
|
|
* Checks if a given value is null or undefined.
|
|
*
|
|
* This function tests whether the provided value is either `null` or `undefined`.
|
|
* It returns `true` if the value is `null` or `undefined`, and `false` otherwise.
|
|
*
|
|
* This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to `null` or `undefined`.
|
|
*
|
|
* @param x - The value to test for null or undefined.
|
|
* @returns `true` if the value is null or undefined, `false` otherwise.
|
|
*
|
|
* @example
|
|
* const value1 = null;
|
|
* const value2 = undefined;
|
|
* const value3 = 42;
|
|
* const result1 = isNil(value1); // true
|
|
* const result2 = isNil(value2); // true
|
|
* const result3 = isNil(value3); // false
|
|
*/
|
|
declare function isNil(x: any): x is null | undefined;
|
|
//#endregion
|
|
export { isNil }; |