Generic Builder Example - Not Tested

generic-builder.tsx

class Builder<T> {
  private data: Partial<T> = {};

  constructor(initialData?: Partial<T>) {
    if (initialData) {
      this.data = { ...initialData };
    }
  }

  with<K extends keyof T>(key: K, value: T[K]): Builder<T> {
    this.data[key] = value;
    return this;
  }

  build(): T {
    return this.data as T;
  }
}

interface User {
  name: string;
  age: number;
  email?: string;
}

const userBuilder = new Builder<User>();

const user = userBuilder
  .with("name", "John")
  .with("age", 30)
  .with("email", "[email protected]")
  .build();

console.log(user.name); // Autocomplete works for 'name', 'age', and 'email'