While exploring the Vue.js source code located at
packages/reactivity/src/effects.tsexport interface ReactiveEffectRunner<T = any> {
(): T
effect: ReactiveEffect
}
I'm curious, what does () signify in the code block?
If you are looking to create a function with additional properties, you can utilize this specific pattern.
() signifies that the object implementing this interface will act as a callable function without any required parameters.
effect indicates that there is an added property named effect.
A sample code snippet from the documentation:
type DescribableFunction = {
description: string;
(someArg: number): boolean;
};
function doSomething(fn: DescribableFunction) {
console.log(fn.description + " returned " + fn(6));
}
Explore more about call signatures
It signifies that the type is capable of being executed as a function.
For instance:
declare const fn: ReactiveEffectRunner<{ abc: number }>
const result = fn() // { abc: number }
fn.effect // ReactiveEffect
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