Nested Object.assign calls formatting

Object.assign.js

let object = {
    key: {
        subkey: 'value',
        status: 'STATUS'
    }
};

// compact
Object.assign( {}, object, { key: Object.assign( {}, object.key, { status: 'PENDING' } ) } );

// expanded
Object.assign(
    {},
    object,
    {
        key: Object.assign(
            {},
            object.key,
            { status: 'PENDING' }
        )
    }
);

// mixed
Object.assign(
    {}, object, {
        key: Object.assign(
            {}, object.key, {
                status: 'PENDING'
            }
        )
    }
);

// other?