IsEqual

Resolves to true when two types are exactly the same, and false otherwise.

type Same = IsEqual<A, B>;

Usage

IsEqual<A, B>

Use it when you need an exact comparison rather than assignability. Unlike a plain conditional type, it tells any apart from every other type, which is handy for catching an accidental any in type-level tests.

import type { IsEqual } from 'es-toolkit/types';

type A = IsEqual<{ a: string }, { a: string }>; // true
type B = IsEqual<string, 'literal'>; // false

// A plain conditional cannot tell these apart, but IsEqual can.
type C = IsEqual<unknown, any>; // false
type D = IsEqual<any, any>; // true

Type Parameters

• A: The first type to compare.
• B: The second type to compare.