There is no issue with this code now, and the Typescript compiler deems it completely valid. However, are these two type definitions truly identical? Can someone provide an explanation of the differences between them, along with some practical examples for each?
const b = () => 'hello'
const x: ()=> string = b
const y: {():string} = b
Both options are equal.
The alternate form provides the opportunity to include additional static properties if desired.
type FunctionWithId = {
(): string;
id: number;
}
const b = () => 'hello'
b.id = 4;
const x: FunctionWithId = b
Additionally, you can utilize the second version for function overloading:
type Example = {
(x: number): number;
(x: string): string;
}
If you require any of these extra features, opt for the second syntax. Otherwise, either option is suitable, with the first being more commonly used due to its simplicity.
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