Creating a single definition that encompasses the characteristics of both primitive and generic types without the need for combining them

Here is a scenario where I need to consolidate and refactor two types:

...
.then((result1: any) => {
    let promises = {
       one: $q.when(val1),
       two: $q.when(val2)
    };
    return $q.all(promises);
})
.then((resolvedPromises: any) => {
    // use
    resolvedPromises.one...
    resolvedPromises.two
});

I want to define a single type (possibly generic) for both promises and resolvedPromises, instead of having separate types with similar definitions.

Instead of:

public interface ResultingType {
    [id: string]: any,
    one: Something1,
    two: Something1
}

public interface PromisingType {
    [id: string]: ng.IPromise<any>,
    one: ng.IPromise<Something1>,
    two: ng.IPromise<Something2>
}

The challenge lies in defining the outer type, either as ng.IPromise<> or nothing.

I want to avoid creating a type that allows mixing both types:

public interface ConsolidatedType {
    [id: string]: any | ng.IPromise<any>,
    one: Something1 | ng.IPromise<Something1>,
    two: Something2 | ng.IPromise<Something2>
}

This would lead to inconsistencies. Are there any other efficient ways to create a single type without redundant code that only wraps types into promises?

Answer №1

How about trying this approach:

interface BaseType<T, S> {
    [id: string]: T;
    one: S;
    two: S;
}

Then follow it up with:


...
.then((result1: any) => {
    let promises = {
       one: $q.when(val1),
       two: $q.when(val2)
    } as BaseType<ng.IPromise<any>, ng.IPromise<Something1>>;
    return $q.all(promises);
})
.then((resolvedPromises: BaseType<any, Something1>) => {
    // utilize
    resolvedPromises.one...
    resolvedPromises.two
});

You can also define "shortcuts" for convenience:

interface PromiseType extends BaseType<ng.IPromise<any>, ng.IPromise<Something1>> {}

interface ValueType extends BaseType<any, Something1> {}

And then continue with:


...
.then((result1: any) => {
    let promises = {
       one: $q.when(val1),
       two: $q.when(val2)
    } as PromiseType;
    return $q.all(promises);
})
.then((resolvedPromises: ValueType) => {
    // utilize
    resolvedPromises.one...
    resolvedPromises.two
});

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