What is “type '{}'”?

Question

In TypeScript, what exactly is type \'{}\' and how does it relate to other built-in types?

For example, the last line of the following example gives

Answer 1

You need to have your call function like this:

function call(fn: NoArgsFn): T {
    return fn();
}

In your original call function you had 2 generic types which you did not pass when calling the function and the compiler failed to infer what types they are.

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Edit

Type {} is an object literal (as far as I'm aware), and so you can face the same error like this:

var o = {};
var n: number = o; // Error: Type '{}' is not assignable to type 'number'

I'm not exactly sure why the compiler inferred that the function returns {} in your example.