Original Factory Builder Implementation

factory.js

function dependantProperty(func, deps) {
  func.dependencies = deps;
  return func;
}

function build(factory, overrides = {}) {
  let keys = Object.keys(factory);
  let result = {};

  do {
    const nextKeys = [];

    for (let i in keys) {
      const key = keys[i];
      
      if (key in overrides) {
        result[key] = overrides[key];
      } else if (factory[key] instanceof Function) {
        if (!factory[key].dependencies || factory[key].dependencies.every((k) => k in result)) {
          result[key] = factory[key](result);
        } else {
          nextKeys.push(key);
        }
      } else {
        result[key] = factory[key];
      }
    }

    keys = nextKeys;
  } while(keys.length > 0);
  
  return result;
}