Record<Keys, Type>
用于构造一个对象类型，其属性键为Keys ，属性值为Type 。该实用程序可用于将一种类型的属性映射到另一种类型。 这在声明一个key-value类型时很有帮助。
ts
type MyRecord = Record<string, number>;
const myObject: MyRecord = {
key1: 10,
key2: 20,
};type MyRecord = Record<string, number>;
const myObject: MyRecord = {
key1: 10,
key2: 20,
};可替代的：
ts
type Dictionary = { [key: string]: number };type Dictionary = { [key: string]: number };或者全局声明：
ts
declare global {
type Dictionary<T> = { [key: string]: T };
}declare global {
type Dictionary<T> = { [key: string]: T };
}相关参考：
TypeScript: Documentation - Utility Types
node.js - No index signature with a parameter of type 'string' was found on type - Stack Overflow