import objectUnfreeze from 'object-unfreeze';

let subject,
    shallowCopy;

subject = {};

Object.freeze(subject);

// Throws an error.
// subject.foo = 'FOO';

shallowCopy = objectUnfreeze(subject);

shallowCopy.foo = 'FOO';

import objectUnfreeze from 'object-unfreeze';

let subject,
    shallowCopy;

subject = [];

Object.freeze(subject);

// Throws an error.
// subject.push('FOO');

shallowCopy = objectUnfreeze(subject);

shallowCopy.push('FOO');