The Object.assign() method copies all enumerable own properties from one or more source objects to a target object. It returns the modified target object.

(c) MDN

🐊Putout plugin adds ability to remove useless assign. Check it out in 🐊Putout Editor.

npm i @putout/plugin-remove-useless-assign

{
    "rules": {
        "remove-useless-assign": "on"
    }
}

const load = stub().rejects(assign(Error('LOAD USED')));

const load = stub().rejects(Error('LOAD USED'));

MIT