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isNullOrUndefined - util - Node documentation
function isNullOrUndefined

Usage in Deno

import { isNullOrUndefined } from "node:util";
isNullOrUndefined(object: unknown): object is null | undefined
Deprecated

Since v4.0.0 - Use value === undefined || value === null instead.

Returns true if the given object is null or undefined. Otherwise, returns false.

import util from 'node:util';

util.isNullOrUndefined(0);
// Returns: false
util.isNullOrUndefined(undefined);
// Returns: true
util.isNullOrUndefined(null);
// Returns: true

Parameters

object: unknown

Return Type

object is null | undefined