如何使用 Typescript 在 React 中循环两个接口 Props 的联合

Question

From the structure below working with React 16.9.0 and Typescript ^16.9.20" :

file A.ts:
export interface person{
  id: number || null,
  first_name: string,
  date_of_birth: string,
  some_unique_number: string,
}


file B.ts:
export interface member{
 group_name: string:
 first_name: string,
 pass_code: string,
 some_unique_number: string,
}


file C.tsx:
# import file A
# import file B

interface Props {
  result: Array<person | member>; 
}

let newResult: any[] = [];                       <=== I feel like `any[]` is wrong maybe

if (result) {
    newResult = results.map((result) => {
      return (
        <div className="something" key={item.some_unique_number}>
          {result.id}
          {result.first_name}
          {result.date_of_birth}
          {result.group_name}
          {result.pass_code}
        </div>
      );
    });
  }

My current solution above is generating the error below:

Property 'id' does not exist on type 'person | member'.
  Property 'id' does not exist on type 'member'.  TS2339

    20 |         <div className="something" key={item.external_member_id}>
  > 21 |           {item.id}

Basically what i am trying to accomplish is loop through both interface and display the union of both A and B.

Thank you in advance.

Answer 1

https://medium.com/@martin_hotell/interface-vs-type-alias-in-typescript-2-7-2a8f1777af4c

from the article - "You can define same interface multiple times, and its definitions will merge into one:"

Not sure if this works but if we were being creative with your example:

// file A.ts
export interface person{
  id: number || null,
  first_name: string,
  date_of_birth: string,
  some_unique_number: string,
}


// file B.ts:
export interface member{
 group_name: string:
 first_name: string,
 pass_code: string,
 some_unique_number: string,
}

export interface peopleOrMember extends member
export interface peopleOrMember extends person

hope that works for you, If it still does not work maybe it is somewhere in that medium link. I copied that link out of the other stackoverflow question that I mentioned.