Array.prototype.includes is not a function in node versions <= 5

[jtschulz]

In node V5, the Array.prototype.includes is hidden behind the harmony flag and not supported in earlier versions. In node 5.4.1, using the literal env throws:

TypeError: (0 , _lodash.keys)(...).map(...).includes is not a function

The entry point to the tests have the line:

require('babel-polyfill');

According to the node docs:

This will emulate a full ES2015+ environment and is intended to be used in an application rather than a library/tool.

Using transform-runtime is recommended for library code, which will not include instance methods and built-ins and pollute the global scope.

Per a slack conversation with @stubailo , I will be furnishing a pull request to solve this.

[jnwng]

closed by #73