Make Update able to handle arrays

[millsp]

🍩 Feature Request

Is your feature request related to a problem?

Describe the solution you'd like

Describe alternatives you've considered

Teachability, Documentation, Adoption, Migration Strategy

[millsp]

@mcpower If you have time to do this, otherwise I'll do this a bit later. When merging your last PRs, I did not find the time to transform Update to the latest standards.

[maroon1]

Exciting, I am just searching a way to convert a instance array(tuple) to constructor type array(tuple).

[millsp]

@maroon1 can you provide a full example of what you are trying to do?

[maroon1]

// convert
type Constructors = [typeof ClassA, typeof ClassA, typeof ClassA];
// to
type InstanceTypes = [ClassA, ClassA, ClassA];

For example:

type MapToInstances<T> = { [K in keyof T]: InstanceType<T[K]>};  // it doesn't not work~

export class Transformer<T> {
  constructor(statics: T) {}

  transform(): MapToInstances<T>;
} 

const transfomer = new Transformer([ClassA, ClassA, ClassA]);
transformer.transform();  // [classA, classA, classA]

[millsp]

You issue isn't related to this one:

For your problem, you needed to use Cast and as const:

import {A, C} from 'ts-toolbelt'

class ClassA {}

// convert
type Constructors = [typeof ClassA, typeof ClassA, typeof ClassA];
// to
type InstanceTypes = [ClassA, ClassA, ClassA];

type MapToInstances<T extends readonly C.Class[]> = {
    [K in keyof T]: C.InstanceOf<A.Cast<T[K], C.Class>>
};

export class Transformer<T extends readonly C.Class[]> {
    constructor(statics: T) {}

    transform(): MapToInstances<T> {
        return {} as any
    }
}

const transformer = new Transformer([ClassA, ClassA, ClassA] as const)
const transformed = transformer.transform() // [ClassA, ClassA, ClassA]

If you remove as const, your array will be narrowed to ClassA[]

If you have more questions, you're welcome to open an issue for it.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.