// A class factory that takes its base and settings as one options object,
// as Effect's makeClass does: `makeClass({ Base, name })` destructures them
// and builds `class extends Base`.
function makeClass({ Base, name, tag: label }) {
  return class extends Base {
    constructor(value) {
      super(value);
      this.kind = name;
      this.label = label;
    }
    describe() {
      return `${this.label}:${this.kind}:${this.value}`;
    }
    // Each class passes itself back as a base: a call site must not
    // specialize makeClass on the classes makeClass itself defines.
    static extend(name) {
      return makeClass({ Base: this, name, tag: label });
    }
  };
}
class Root {
  constructor(value) {
    this.value = value;
  }
}
export function Class(name) {
  return makeClass({ Base: Root, name, tag: "root" });
}
export function extend(Base, name) {
  return makeClass({ Base, name, tag: "sub" });
}