When Object.assign is called using an object literal as the first argument, this rule requires using the object spread syntax instead. This rule also warns on cases where an Object.assign
call is made using a single argument that is an object literal, in this case, the Object.assign
call is not needed.
Examples of incorrect code for this rule:
Object.assign({}, foo)
Object.assign({}, {foo: 'bar'})
Object.assign({ foo: 'bar'}, baz)
Object.assign({ foo: 'bar' }, Object.assign({ bar: 'foo' }))
Object.assign({}, { foo, bar, baz })
Object.assign({}, { ...baz })
// Object.assign with a single argument that is an object literal
Object.assign({});
Object.assign({ foo: bar });
Examples of correct code for this rule:
Object.assign(...foo);
// Any Object.assign call without an object literal as the first argument
Object.assign(foo, { bar: baz });
Object.assign(foo, Object.assign(bar));
Object.assign(foo, { bar, baz })
Object.assign(foo, { ...baz });
When you don't care about syntactic sugar added by the object spread property.