Deprecated APIs

The following APIs are deprecated and should no longer be used. Existing applications and modules should be updated to find alternative approaches.

util._extend(target, source): void

The util._extend() method was never intended to be used outside of internal Node.js modules. The community found and used it anyway.

It is deprecated and should not be used in new code. JavaScript comes with very similar built-in functionality through Object.assign().

An automated migration is available (source):

npx codemod@latest @nodejs/util-extend-to-object-assign

util.isArray(object): boolean

Alias for Array.isArray().

Returns true if the given object is an Array. Otherwise, returns false.

const util = require('node:util');

util.isArray([]);
// Returns: true
util.isArray(new Array());
// Returns: true
util.isArray({});
// Returns: false

An automated migration is available (source):

npx codemod@latest @nodejs/util-is