Don't add types in places where they could be inferred

[urish]

For instance, skip adding types to n parameter of square in the following code, as TypeScript can automatically infer this type:

console.log([1,2,3].map(function square(n) {
  return n*n;
}));

This involves consulting the Type Checker, see infer-types branch / #27 which also involve using the Type Checker API.

[zoehneto]

Since #27 is merged, is this issue resolved or is it still in progress?

[urish]

@zoehneto not yet - it should be quite easy to implement though using the work done in #27 as a foundation

[GeeWee]

Just want to give a thumbs up to this - TypeWiz types all of my it((err? : any => void)) blocks, even though the types are fully specified in the chai docs.