prettify complex type display (for generic-heavy types)

Search Terms

https://github.com/microsoft/TypeScript/labels/Domain%3A%20Type%20Display

Suggestion

give indentations + line-changes on type representation. User config for this might be an option.

Examples

suppose I have some generic-heavy function someFunc that returns

const a = someFunc();
// typeof a = RootGeneric<GenericA, GenericB<number, SubGenericB_A<number> ...
//  full type not shown 😭 

A better output can be:

// typeof a = 
RootGeneric<
    GenericA, 
    GenericB<
        number, 
        SubGenericB_A<number> ...

more things:

• editors can implement "expand(+)" buttons ?
  (collapsed-tree-view)

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.

ファイル、テスト、エントリポイントは指定されていません。issue にあるジェネリック性の高い型の例から始めて、インデント、行の変更、ユーザー設定、エディターの展開について意図された範囲を決定してください。型の表示動作について合意された設計と実装計画が整えば完了です。