Expose more internal api for making language service plugins.

Search Terms

language service plugin api refactor codefix vscode

Suggestion

• ts.refactor.registerRefactor
  A more standard way to make refactor rather than hook the language servies functions.
  And refactor is a rare api that I do not need to write ui code or command for vscode.
• ts.textChanges.*
  Use this, I can easily generate code or modify code that conform the current code format style.
  Especially you don't expose the ts.formatting.*
• ts.TypeChecker.getTrueType() ts.TypeChecker.getFalseType()
  The TypeFlags.BooleanLiteral is not enough to determine it is true or false.

Use Cases

https://github.com/heroboy/generate-typescript-switch-case-for-enum-type-language-service-plugin

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.

Start by reviewing the TypeScript language service plugin APIs and the requested entry points: ts.refactor.registerRefactor, ts.textChanges., ts.formatting., and TypeChecker.getTrueType()/getFalseType(). Compare them with the linked generate-typescript-switch-case-for-enum-type-language-service-plugin use case; done requires a scoped, agreed public API proposal rather than implementing all listed requests.