数组查找方法错误元素隐式具有“任何”类型

Question

我遇到了 Typescript linting 的问题。场景是数据来自包含对象数组的 API。

[
  {
    "id": 3,
    "name": "politics",
    "slug": "politics",
  },
  {
    "id": 2,
    "name": "sport",
    "slug": "sport",
  },
  {
    "id": 1,
    "name": "weather",
    "slug": "weather",
  }
]

我想要的是在创建任何新对象并尝试在服务器上发布之前，我们必须确保slug 是唯一的。所以我创建了一个名为uniqueStr 的实用函数，它将检查slug 是否存在。

ICategory.ts:

export interface Category {
    id: number;
    name: string;
    slug: string;
    parent: number;
}

utility.ts

import {Category} from './ICategory';

export const uniqueStr = (property: string, compareValue: string, data: Category[]): string => {

    if (Array.isArray(data) && data.length > 0) {
        const objectFind = data.find((element) => {
            return element[property] === compareValue;
        });
        // If not undefined
        if (objectFind) {
            const message = `${property} value should be unique.`;
            alert(message);
            throw new Error(message);
        } else {
            // Return value
            return compareValue;
        }
    }
    return compareValue;
};

在以下行 return element[property] === compareValue Typescript linter 出现错误。

TS7053: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'Category'. No index signature with a parameter of type 'string' was found on type 'Category'.

Answer 1

您可以使用indexable-types 来指定可以通过字符串索引访问Category 接口实例的属性。

例子：

interface Category {
    id: number;
    name: string;
    slug: string;
    parent: number;
    [key: string]: number | string;
};

Answer 2

试试这个

const index = this.selectedActors.findIndex((a: { name: any; }) => a.name === actor.name);

之前用这个

const index = this.selectedActors.findIndex((a => a.name === actor.name);