打字稿问题：类型“...”不可分配给类型“...”答案

【问题标题】：Typescript issue: Type '...' is not assignable to type '...'打字稿问题：类型“...”不可分配给类型“...”
【发布时间】：2022-02-06 11:25:13
【问题描述】：

我正在使用nestJS，我有 2 项服务，在1st service:

async getOrganizations (attributes: (keyof Organization)[]): Promise<Partial<Organization>[]> { 

    const organizations = await this.organizationRepository.find({select: attributes})
    
    return organizations; 
    //returns [{id:1, name: "x"},{id:2, name: "y"},..]

  }

在2nd service:

async getOrganizations(): Promise<CustomerResponseDto[]> {
        const attributes : (keyof Organization)[] = ['id', 'name'];

        let organizations = await this.1stService.getOrganizations(attributes);

        organizations = organizations.map((organization)=>{
            return {
                ...organization,
                type: 'Organization'
            }
        })
        
        return organizations;
    //returns [{id:1, name: "x", type: 'Organization'},{id:2, name: "y", type: 'Organization'},..]
    }

还有CustomerResponseDto：

export interface CustomerResponseDto {
    readonly id: number;
    readonly name: string;
    readonly type: string;
}

现在我收到以下错误：

Type 'Partial<Organization>[]' is not assignable to type 'CustomerResponseDto[]'.
  Property 'type' is missing in type 'Partial<Organization>' but required in type 'CustomerResponseDto'.
    22 |         })
    23 |
  > 24 |         return organizations;
       |         ^^^^^^^^^^^^^^^^^^^^^
    25 |     }

请指教

【问题讨论】：

为什么不指定map回调的返回类型，以便编译器检查：organizations.map((organization): CustomerResponseDto => ...。为什么要重用已经隐式类型为Partial<Organization>[] 的变量？
（例如minimal reproducible example: tsplay.dev/NVa3nw）
非常感谢，这很有帮助，问题与变量命名有关，祝您有愉快的一天
请提供足够的代码，以便其他人更好地理解或重现问题。

标签： typescript nestjs

【解决方案1】：

现在可以了，问题与变量命名有关在2nd service 我改变了：

organizations = organizations.map((organization)=>{
            return {
                ...organization,
                type: 'Organization'
            }

成为

const organizationsWithType = organizations.map(({ id, name })=>{
            return {
                id,
                name,
                type: 'Organization'
            }
        })

【讨论】：