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Declaring the type of 'this' in a typescript function?

I'm writing a grunt task in TypeScript. I'm trying to translate something I already have in JavaScript.

So, when grunt runs a task, it runs a function. When it runs, grunt sets this to an object with useful properties, the same way that jQuery overloads this with the element you are working on. I could access useful properties like this.files;

grunt.registerMultiTask('clean', function() {
    this.files.forEach(function(f) { Delete(f); });
});

So, "delete all the files in this.files".

However, in TypeScript, I don't know if you can 'hint' to the compiler that this is a particular type, so I don't get intellisense. How do I tell TypeScript to consider this to be a different type?

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Now (from TS 2.0) you can specify function's this type by using fake this parameter (should be the first one):

grunt.registerMultiTask('clean', function(this: SomeType) {
    //...
});

this parameters are fake parameters that come first in the parameter list of a function

More info here


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