ECS.ts

abstract class System<T extends { [index:string]:Component[] }> {
    query: { [P in keyof T]?: QueryCollection<T[P][]> }
}

class QueryCollection<T> {
    components:T;
    listen?: {
        added?: (value:T) => void;
        removed?: (value:T) => void;
    }
}

type RenderSystemQuery = {
    "sprites": [ Sprite, Transform ]
}

class RenderSystem extends System<RenderSystemQuery> {
    constructor() {
        super()

        this.query.sprites.components.forEach(([sprite, tranform]) => {

        });

        this.query.sprites.listen.added = ([Sprite, Transform]) => {

        };
    }
}