boardgame-core/src/core/part-factory.ts

import {Part} from "./part";
import {Immutable} from "mutative";

export function createPartsFromTable<T>(items: readonly T[], getId: (item: T, index: number) => string, getCount?: ((item: T) => number) | number){
  const pool: Record<string, Part<T>> = {};
  for (const entry of items) {
    const count = getCount ? (typeof getCount === 'function' ? getCount(entry) : getCount) : 1;
    for (let i = 0; i < count; i++) {
      const id = getId(entry, i);
      pool[id] = {
        id,
        regionId: '',
        position: [],
        ...entry as Immutable<T>
      };
    }
  }
  return pool;
}

export function createParts<T>(item: T, getId: (index: number) => string, count?: number){
  return createPartsFromTable([item], (_,index) => getId(index), count);
}