strictNullChecks mode - Variable is used before being assigned.

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.

Slightly related the following will also issue similar error:

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

Yui (@yuit)

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

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strictNullChecks mode - Variable is used before being assigned. #10641

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strictNullChecks mode - Variable is used before being assigned. #10641

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yuit commented on Sep 8, 2016

ahejlsberg commented on Sep 9, 2016

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