Allow type checking (fixes #67)

[bgold09]

• Providing typeCheck: true in the options for the task will create
  a TypeScript program instance to be used during linting.

fixes #67

[DirtyHairy]

What's the status here?

[adidahiya]

mostly looks good, but we should add support for configuring tsconfig.json

[adidahiya]

I think we need to add tsconfig.json as a config option, just like the CLI tslint --project <filepath>, and add one to this test scenario

[bgold09]

Do you mean so that we can pass the options to ts.createProgram() in the task (line 68)?

[adidahiya]

yes

[bgold09]

makes sense, I'll work on that addition

[mblandfo]

I expect the code here would not work when you're type checking a file, but you have definitions defined in a .d.ts file somewhere that wasn't passed to createProgram.

Here's how they called createProgram in tslint: https://github.com/palantir/tslint/blob/f22a3af28f2e3429ca223b0438b4a9b5b5ce0d62/src/linter.ts

I notice that in tslint they call createProgram once for all files, and create a single linter. Here it looks like grunt-tslint creates a linter and program for every file.

[schaable]

what's the status of this? would be great to have typeCheck available as an option

[bgold09]

Closing in favor of #77