Flexibility of template literal types for enums

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typescript
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compilers

调研方向

首先审查 issue 中提出的 template literal types 与 enum 键/值对之间的交互。payload 未列出任何文件、测试或入口点，语法和语义仍停留在推测阶段。只有确定了 enum 排列的设计，并制定了明确的实现和验证计划，才能算完成。

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描述

Awaiting More Feedback Suggestion

Search Terms

template literal type enum permutations

Suggestion

Typescript 4.1 brought template literal types, which make it simple to express all the possibilities of permutations of unions of string types concatenated together. It would be cool if there was some equivalent syntax for expressing enum key/value pairs with the same level of expressivity that template literal types provide.

Use Cases

However, my codebase right now uses enums for these kinds of string types, so if I want to express a bunch of permutations of possible values with an enum, I can't really leverage template literal types in this case.

Examples

this is just some syntax I'm making up, I don't know how this would work especially for dealing with keys and values separately:

enum Color {
  RED,
  BLUE
}
enum Shape {
  SQUARE,
  CIRCLE
}
enum ColoredShape {
  [`${keyof Color}_${keyof Shape}`]
}

console.log(ColoredShape.RED_SQUARE, ColoredShape.BLUE_CIRCLE)

Checklist

My suggestion meets these guidelines:

  • This wouldn't be a breaking change in existing TypeScript/JavaScript code
  • This wouldn't change the runtime behavior of existing JavaScript code
  • This could be implemented without emitting different JS based on the types of the expressions
  • This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
  • This feature would agree with the rest of TypeScript's Design Goals.
    • I think?
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