Optimize auth.js: Replace defaultsDeep with Object.assign

[maslowivan]

Summary

defaultsDeep includes the lodash.defaultsdeep file what weight 51kb
we can use just Object.assign here

Todo

• Tests
  • Unit
  • Integration
  • Acceptance
• Documentation
• Type label for the PR

[maslowivan]

We can add the Object.assign as a polyfill for the old browsers but I think a lot of projects are already have this polyfill. However, the defaultsDeep requires to use the webpack alias hacking like:

Object.assign(config.resolve.alias, {
    // ...
    'lodash.defaultsdeep': path.join(__dirname, './library-hooks/lodash.defaultsdeep/index.js'),
  });

export default function defaultsDeep(a, b, c) {
  return Object.assign(a, b, c);
}

[maslowivan]

Other option is to use the simple Object.create

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[ajimae]

This has been fixed here