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 }; ...
为了为未来提供一个数据点，我们目前不允许在使用import type导入时在值空间中使用const enum,这是好的...
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。
Non-const enums When you declare anenum, TypeScript will generate code for it. For example, this TypeScriptsnippet: enumBool{True,False,FileNotFound}letvalue=Bool.FileNotFound; will compile to this JavaScript: varBool;(function(Bool){Bool[(Bool["True"]=0)]="True";Bool[(Bool["False"]...
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 enum,否则你将破坏像esbuild这样的...
Learn the differences between let and const in TypeScript, including their scope, hoisting behavior, and best practices for usage.
closes #10097 By searching asEmbeddedStatement in https://github.com/microsoft/TypeScript/blob/main/src/compiler/factory/nodeFactory.ts, we can know there are four cases where typescript doesn't in...
Bug Report preserveValueImports doesn't error when you import an ambient const enum with isolatedModules on. Instead you get an error at runtime. 🩹 Proposed Solution If the named import were a type vs. an ambient const enum, you'd get a ...
--- 19.1 控制内存分配 当使用一条 new表达式时string *sp =Type又叫类型别名（type alias）,作用...