Type-safe object property value references

ObjectValue.ts

export interface IObjectValue<T> {
	set(value: T): void;
	get(): T;
}

export class ObjectValue<K extends keyof T, T> implements IObjectValue<T[K]> {
	constructor(private readonly object: T, private readonly key: K) {}
	set(value: T[K]) { this.object[this.key] = value; }
	get() { return this.object[this.key]; }
}