strictNullChecks mode - Variable is used before being assigned.

[aliai]

TypeScript Version: nightly (2.0.2)

In strictNullChecks mode only:

Code

const CONFIG = {
  foo: '',
  setFoo: function(foo: string) {
    // accessing (reading or writing) CONFIG.foo is not allowed!
    CONFIG.foo = foo;  // <-- Error: Variable 'CONFIG' is used before being assigned.
  }
};

Expected behavior:

I don't see why this is not a valid statement.

Actual behavior:

Trying to access any defined member of CONFIG in a method, defined within the object itself, raises an error: Variable 'CONFIG' is used before being assigned.

[yuit]

Slightly related the following will also issue similar error:

const helper = function<T>(t: T[]) {
        helper(t.slice(1));
}

[ahejlsberg]

@yuit I have a fix for this, will be putting up a PR shortly.