property assert | Node.js node:test module | Bun

An object containing assertion methods bound to the test context. The top-level functions from the node:assert module are exposed here for the purpose of creating test plans.

Note: Some of the functions from node:assert contain type assertions. If these are called via the TestContext assert object, then the context parameter in the test's function signature must be explicitly typed (ie. the parameter must have a type annotation), otherwise an error will be raised by the TypeScript compiler:

import { test, type TestContext } from 'node:test';

// The test function's context parameter must have a type annotation.
test('example', (t: TestContext) => {
t.assert.deepStrictEqual(actual, expected);
});

// Omitting the type annotation will result in a compilation error.
test('example', t => {
t.assert.deepStrictEqual(actual, expected); // Error: 't' needs an explicit type annotation.
});