I'm having difficulty understanding the syntax of this interface. It seems to be overloaded, and I am getting an error from the compiler when trying to create a function with one signature but missing the other. My objective here is to mock this function for a Jest unit test.
interface SearchResultSetEachFunction {
promise(callback: (result: Result) => boolean): Promise<boolean>;
(callback: (result: Result) => boolean): void;
}
It's not overloaded; instead, it is a function that also includes a property called promise. You can create such an object using Object.assign:
let fn: SearchResultSetEachFunction = Object.assign(function (callback: (result: Result) => boolean): void {
}, {
promise(callback: (result: Result) => boolean): Promise<boolean> {
return Promise.resolve(false)
}
})
In newer versions of TypeScript, you can use a function declaration and directly assign the promise member in the same scope as the declaration for TypeScript to recognize it as a new member:
function mockSearchResultSetEachFunction(callback: (result: Result) => boolean): void {
}
mockSearchResultSetEachFunction.promise = function (callback: (result: Result) => boolean): Promise<boolean> {
return Promise.resolve(false)
}
let fn: SearchResultSetEachFunction = mockSearchResultSetEachFunction
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