Removes Underscore dependency

[grant]

Goal:

• Remove 1548 lines of Apps Script to improve library parse + load time.
• Remove copypasted [email protected] library from scm.

This PR:

• Removes _ with gulpfile/package.json references
• Use native util methods over _
  • Remove isEmpty_
• Regens docs

Feel free to comment or modify.

[erickoledadevrel]

Not functionally equivalent to isEmpty_(), but I don't think any of my validations rely on detecting empty arrays or objects.

[grant]

Good point.

[erickoledadevrel]

Thanks for the PR! Service.gs still uses _.extend() in a number of places however, and you'll need to find a replacement for that.

[grant]

PTAL.

• Added extend_()
  • Note: Only accepts 2 objects
  • Added Utility tests for this method

npm run test

> mocha
  Service
    #getToken()
      ✓ should load from the in-memory store
      ✓ should load from the cache and set the in-memory store
      ✓ should load from the properties and set the cache and in-memory store
    #saveToken_()
      ✓ should save the token to the properties, cache, and in-memory store
    #reset()
      ✓ should delete the token from properties, cache, and in-memory store

  Utilities
    #extend_()
      ✓ should extend (left) an object
      ✓ should extend (right) an object
      ✓ should extend (merge) an object


  8 passing (10ms)

[erickoledadevrel]

Looks great, thanks Grant!