How does "return null!" resolve in a function?

Asked Jun 09 '22 at 14:57

Active Jun 09 '22 at 15:35

Viewed 25 times

Im looking through a project's code and one of their function's return statements reads

return null!;

What does "!" after null mean? Also, when I rewrite it like:

return !null;

I get a linting error

edited Jun 09 '22 at 15:35

asked Jun 09 '22 at 14:57

Nephter

2

That's _TypeScript_, and it's bonkers - they're returning `null` and asserting that it's [**not** `null`](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#non-null-assertion-operator-postfix-). – jonrsharpe Jun 09 '22 at 15:00
`return null!;` should be a syntax error (in JavaScript). – Pointy Jun 09 '22 at 15:00
Ah, you're right I'll change the tag @Pointy – Nephter Jun 09 '22 at 15:34

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