Question

请允许我帮助我了解这里发生的情况吗?

type A = { propA: string };
type B = { propB: number }

type U = A | B;

class Model {}

class SingleModel extends Model {

  constructor(input: U) {
    super();
  }
}

class MultiModel extends Model {

  constructor(input: U[]) {
    super();
  }
}

type sheetType = new (input: U | U[]) => Model;

const config: { sheet: sheetType }[] = [
  { sheet: MultiModel },
  { sheet: SingleModel },
];

这里正出现错误:TS:2322 on sheetpropp in config 这里有什么错误?

Answer 1

单独书写两种构造的结合,而不是必须接受的单一类型。 U和U[]作为参数。

type sheetType = (new (input: U) => Model) | (new (input: U[]) => Model);

Answer 2

您还可以提取两种可读性建筑类型:

type SingleSheetType = new (input: U) => Model;
type MultiSheetType = new (input: U[]) => Model;

type sheetType = SingleSheetType | MultiSheetType;

const config: { sheet: sheetType }[] = [
  { sheet: MultiModel },
  { sheet: SingleModel },
];

友情链接