Illustration:
function a(...args: ???type of b() params???) {
b(...args)
}
The goal is for args to match the type of parameters in function b.
This idea is aimed at improving code readability and encapsulation. The function b is imported, so I don't need to worry about its implementation when declaring function a.
If you want to achieve this functionality, the solution lies in version 3.0 with the introduction of Tuples in rest parameters and spread expressions (currently in RC phase)
type ArgumentType<T> = T extends (...args: infer U) => any ? U : never;
function a(...args: ArgumentType<typeof b>) {
function b(...args: any[]) {
}
}
// Demonstrating more complex examples
function a2(...args: ArgumentType<typeof b>) {
function b(name: string, value: number) {
}
}
a2("", 1);
This provides an alternative approach:
function customFunction(...input: Parameters<typeof targetFunction>) {
targetFunction(...input);
}
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