Imagine having a high order function that returns another function:
function factory() {
return function baz(payload: { [key: string]: {} }): 'hello' {
return 'hello';
}
}
const foo = factory();
Now, foo is the function baz with a generic argument signature:
interface payload {
[key: string] : {}
}
The goal is to overload this signature for foo only to make it more precise:
function foo(payload: {id: string}) {}
How can I accomplish this?
Perhaps this code snippet illustrates the concept?
function factory<P extends { [key: string]: {}}>() {
return function baz(payload: P): 'hello' {
return 'hello';
}
}
const foo = factory<{id: string}>(); // This works fine
const bar = factory<number>(); // This will result in an error
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