Is there a way to achieve something similar in TypeScript like the following:
export type CoordinateSelector = <T>(d: Coordinate) => d[T];
export interface LinkVerticalLineProps {
x: CoordinateSelector<'x'>;
y: CoordinateSelector<'y'>;
}
I want to avoid creating individual x and y coordinate selectors as shown below:
export interface LinkVerticalLineProps {
x: (d: {x: number}) => d.x;
y: (d: {y: number}) => d.y;
}
Is it possible to accomplish this type of functionality?
In the case that your inquiry pertains solely to typings, the response is as follows:
export type SelectorCoordinate<T extends keyof Coordinate> = (d: Coordinate) => typeof d[T];
export interface LineProps {
x: SelectorCoordinate<'x'>;
y: SelectorCoordinate<'y'>;
}
An interface serves as a definition and cannot be directly executed. Actual code must still be provided for runtime implementation. For instance:
const getY: SelectorCoordinate<'y'> = coordinate => coordinate.y;
Searching for this specific type of structure?
export class A<T> {
public g: new () => T;
public o: T;
constructor(g: { new(): T }) {
this.g = g;
this.o = new this.g();
}
}
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