如何将自定义类型转换为原始类型？ [英] How can I cast custom type to primitive type?

问题描述

我有一个类型

type Rating = 0 | 1 | 2 | 3 | 4 | 5 | number

现在我想做这样的事情。

Now I want to do something like this.

let myRating:Rating = 4
let rate:number = myRating as number

我如何将 myRating 转换为 number 基本类型？

How can I cast my myRating into number primitive type?

给我一​​个错误，为：

It is giving me error as:

将评级类型转换为数字可能是一个错误，因为这两种类型都不足以相互重叠。如果这是故意的，请先将表达式转换为未知。ts（2352）

Conversion of type 'Rating' to type 'number' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.ts(2352)

我已经通过此，但我想要的是相反的

I have been through this, but what I want is its reverse

编辑：

tsconfig.json

tsconfig.json

{
  "compilerOptions": {
    "noImplicitAny": false,
    "target": "es6",
    "allowJs": true,
    "skipLibCheck": false,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "forceConsistentCasingInFileNames": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "preserve",
    "strict": true
  },
  "include": [
    "src"
  ]
}

tsc版本： 3.2.1

tsc version: 3.2.1

推荐答案

尝试：

myRating as unknown as number

相同，也请删除 |您的声明中的数字。

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