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"Used before assigned" error with arrow functions and strict null checks #9382
Description
Activity
The error message is a bit misleading. the message is about the type system trying to know what is the type of
fand catching its own tail. so an explicit type annotation would resolve the issue. so:const f: any = () => { return f; };
This gives the same error, although I added an explicit type annotation.
const f: () => void = () => { f; }
But the following gives no error:
let f: () => void; f = () => { f; }
Christoph (@Christoph-D) I don't receive the error if I change the definition of the function from
consttolet.
So basically this gives me an errorconst t2 = (): number => 1 + t2();
while this does not
let t = (): number => 1 + t();
should be fixed by #10815
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on Jun 19, 2018
TypeScript Version:
1.9.0-dev.20160627-1.0
Code
Compiled with
--strictNullChecks.Expected behavior:
No errors.
Actual behavior:
It sems to be impossible to call
fbeforefis assigned, so I don't think this should trigger an error.