w3schools 有这个例子: enum StatusCodes { NotFound = 404, Success = 200, Accepted = 202, BadRequest = 400 } 在这个例子中为什么要使用 enum 而不是 const ?它具有相同的类型检查并且不使用枚举增量。 const StatusCodes = { NotFound: 404, Success: 200, Accepted: 202, BadRequest: 400 }; ...
type导入时在值空间中使用const enum,这是好的。但这个问题需要我们仍然允许在非类型导入中使用const ...
Using Enums in TypeScript is a great way to access particular parameters that are meant to be shared across multiple files, for example access levels of a particular user or a particular constant. But Enums generate a lot of code, and by introducing the const keyword in TypeScript alongside...
enum中的const意味着enum在编译期间被完全擦除。常量枚举成员在使用站点内联。你不能用任意的值来索引它。
enum:现在想想 enum 枚举类型非常实用,很多其它的语言都内置了这一类型,合理的使用枚举,能让我们的代码可读性更高,比如: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 constenumMediaTypes{JSON="application/json"}fetch("https://swapi.co/api/people/1/",{headers:{Accept:MediaTypes.JSON}}).then(...
This is because TypeScript treats enums as if they were real objects at runtime, even non-const enums. We can use this construct as shown in the example below: const directionEnum = Object.freeze({ UP : "UP", DOWN: "DOWN" }); console.log(directionEnum) //{ UP: 'UP', DOWN: ...
type导入时在值空间中使用const enum,这是好的。但这个问题需要我们仍然允许在非类型导入中使用const ...
在TypeScript中,要跨多个文件声明枚举,可以使用模块化的方式来实现。下面是一种常见的方法: 1. 创建一个独立的文件,用于定义枚举类型。例如,我们可以创建一个名为enums.ts的文件。 ...
// eslint-disable-next-line no-const-enum const enum Const { One, } const enum Enum { // eslint-disable-line no-const-enum Two, } You can still disable rules with an .eslintrc.json, but should not in new packages. Disabling rules for the entire package makes it harder to review...
💻 Would you like to work on this feature? What problem are you trying to solve? @babel/plugin-transform-typescript currently turns const enums into var Foo = { Bar: 0, Baz: 1 } but I'd like it if it instead produced const variables Descr...