Can the variable baz be dynamically assigned the string type?
type sampleType = () => ReturnType<sampleType>; // Want to return the type of any function I pass (Eg. ReturnType<typeof foo>)
interface ISampleInterface {
baz: sampleType;
}
function foo(): string {
return 'AAAAAAA';
}
const foobaz = {
baz: foo,
} as ISampleInterface;
const qux = foobaz.baz();
qux; // Qux has type "any"
The purpose of the interface is not clear to me. Here is a revised version that better aligns with what I believe you are aiming for:
interface ICustomInterface<T extends () => any> {
customFunction: () => ReturnType<T>;
}
function sampleFunction(): string {
return 'AAAAAAA';
}
const customObj: ICustomInterface<typeof sampleFunction> = {
customFunction: sampleFunction,
}
const result = customObj.customFunction();
If generic inference was possible, the typeof sampleFunction part would be unnecessary.
It seems like you're putting in a lot of effort. TypeScript actually has a feature called type inference that can handle this for you automatically. Just remove the as IExampleInterface and everything should work smoothly
function foo(): string {
return 'AAAAAAA';
}
const foobar = {
bar: foo,
}
const baz = foobar.bar();
baz; // The type of Baz is now "string"
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