Typescript: How to use a generic parameter as object key
You're close. This falls under the category of Mapped Types. You need to make two changes:
QueryKey extends stringkey in QueryKey
interface GraphQLResponse<QueryKey extends string, ResponseType> { data: { [key in QueryKey]: ResponseType; }}interface User { username: string; id: number;}type UserByIdResponse = GraphQLResponse<'userById', User>;type UserByUsernameResponse = GraphQLResponse<'userByUsername', User>;const userByIdResult: UserByIdResponse = { data: { userById: { id: 123, username: 'joseph' } }}const userByUsernameResult: UserByUsernameResponse = { data: { userByUsername: { id: 123, username: 'joseph' } }}const userByIdResultBoom: UserByIdResponse = { data: { userByUsername: { id: 123, username: 'joseph' } }}