Add a "Export unused declaration" codefix

[pacexy]

🔍 Search Terms

fix unused

✅ Viability Checklist

• 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, new syntax sugar for JS, etc.)
• This isn't a request to add a new utility type: https://github.com/microsoft/TypeScript/wiki/No-New-Utility-Types
• This feature would agree with the rest of our Design Goals: https://github.com/Microsoft/TypeScript/wiki/TypeScript-Design-Goals

⭐ Suggestion

Add a "Export unused declaration" codefix.

📃 Motivating Example

Before:

function Foo () {

}

After (depends on module type):

export function Foo () {

}

💻 Use Cases

Sometime we may forget to export a declaration and hence the declaration is marked as unused.
To fix it, we have to back to export it manully, which is cumbersome.