当不可变记录中存在枚举时，打字稿会出错

Question

import { Record } from 'immutable'

export enum PriceRelationType {
  nForX,
  nForPriceOfX
}

export interface PriceRelation {
  type: PriceRelationType
  quantity: number
  price: number
}

export interface ProductType {
  id: string
  name: string
  image: string
  description: string
  price: {
    relations: PriceRelation[]
    scale: number
  }
}

export const ProductRecord: Record.Factory<ProductType> = Record({
  id: '',
  name: '',
  image: '',
  description: '',
  price: {
    relations: [{ quantity: 0, price: 0, type: PriceRelationType.nForX }],
    scale: 0
  }
})

对于给定的代码块，Typescript 通过给出以下错误拒绝编译它

Types of property 'price' are incompatible.
            Type '{ relations: PriceRelation[]; scale: number; } | undefined' is not assignable to type '{ relations: { quantity: number; price: number; type: PriceRelationType.nForX; }[]; scale: number; } | undefined'.
              Type '{ relations: PriceRelation[]; scale: number; }' is not assignable to type '{ relations: { quantity: number; price: number; type: PriceRelationType.nForX; }[]; scale: number; }'.

枚举值似乎有问题，删除它可以修复错误。

Answer 1

我怀疑显式输入关系数组可以解决这个问题，例如：

export const ProductRecord: Record.Factory<ProductType> = Record({
  id: '',
  name: '',
  image: '',
  description: '',
  price: {
    relations: <PriceRelation[]>[ <PriceRelation>{ quantity: 0, price: 0, type: PriceRelationType.nForX }],
    scale: 0
  }
})

当不可变记录中存在枚举时，打字稿会出错

Typescript errors out when enums are present inside an Immutable record

typescript

immutable.js