base resource definition

Resource.ts

class Resource {
  constructor(args) {
    Object.assign(this, args);
  }

  static url({ id }: { id: string }) {
    return `${this.urlRoot}${id}`;
  }
  
  // This generic enables us to establish the correct return value based on the polymorphic call
  static detailShape<T extends Resource>(this: T) {
    return async ({ id }: { id: string }): T {
      const options = {
        method: 'GET',
        credentials: 'same-origin',
        headers: {
          'Content-Type': 'application/json',
        },
      };
      const url = this.url({ id });
      const response = await (await fetch(url, options)).json();
      return new PostResource(response);
    }
  }
}