isMatch

Problem

You need partial structural matching — checking that an object contains at least the keys and values of a source, without requiring exact equality.

Solution

Use isMatch(object, source) to confirm that object has every key-value from source (recursively).

import { isMatch } from '@vielzeug/arsenal';

const user = { id: 1, name: 'Alice', role: 'admin', active: true };

isMatch(user, { role: 'admin' }); // true
isMatch(user, { role: 'admin', active: true }); // true
isMatch(user, { role: 'user' }); // false

Pitfalls

• Map and Set sources always return false — use isEqual for those types.
• Only checks keys present in source — extra keys in object are ignored.

Related

• isEqual