Automatic completion, renaming, go to define based on decorator parameters

🔍 Search Terms

language server, decorator, auto completions

✅ 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

In the following example, when no function return type is specified, the decorator parameter type should be automatically completed, renamed, and go to define.

📃 Motivating Example

This makes it easier to write when applying decorator

💻 Use Cases

playground

从链接的 TypeScript Playground 示例开始，并在那里复现 decorator 参数场景。跟踪 language service 在省略函数返回类型时当前如何处理 completion、rename 和 go-to-definition；完成的标准是，这三个操作都能对 decorator 参数正常工作，同时不改变生成的 JavaScript。