Andrey (azangru) wrote,

Typescript surprises me.

Say we have a function:

What will the type of the return value be? What if there is no colon in the provided string — then bar will be undefined. But typescript has the utmost confidence in the programmer, and is happy to infer that both foo and bar are strings:

This is dangerous! Here, we shall get an undefined is not a function:

Flow behaves the same, by the way.

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