typescript - 与字符串一起使用时，TypeScript 管道运算符是什么意思？

Question

我知道联合类型，但是这个管道语法是什么意思？

let propName: "name" | "age" | "location";

来源: https://blogs.msdn.microsoft.com/typescript/2016/12/07/announcing-typescript-2-1/

Answer 1

回答我自己的问题:那些是“字符串文字类型”，如 https://www.typescriptlang.org/docs/handbook/advanced-types.html#string-literal-types

String literal types allow you to specify the exact value a string must have. In practice string literal types combine nicely with union types, type guards, and type aliases. You can use these features together to get enum-like behavior with strings.