What does the "as" keyword do?

Issue

if (process.env.NODE_ENV !== 'production') {
    (WithUser as any).displayName = wrapDisplayName(Component, 'withUser');
}

I'm not even sure if as is a keyword, but anyway, what does it do in JavaScript?

Solution

That is not vanilla JavaScript, it is TypeScript. as any tells the compiler to consider the typed object as a plain untyped JavaScript object.

The as keyword is a Type Assertion in TypeScript which tells the compiler to consider the object as another type than the type the compiler infers the object to be.

Answered By - Adrian Brand