Use LazyBarrel to improve IDE performance

🔍 Search Terms

"re-export", "barrel file", "optimization", "performance"

✅ 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

Can the Typescript Language Server implement and use its own version of the LazyBarrel optimization as an experimental feature to improve IDE performance?

📃 Motivating Example

This feature should improve IDE performance (e.g. type highlight) and reduce the impact of barrel files on Typescript codebases.

Explanation provided on LazyBarrel.

💻 Use Cases

1. What do you want to use this for?

Improving IDE performance.

2. What shortcomings exist with current approaches?

Barrel files have a significant impact on IDE performance in Typescript codebases.

3. What workarounds are you using in the meantime?

Manually de-barreling packages.

从 TypeScript Language Server 和链接的 LazyBarrel 说明开始，以了解所提议的优化及其范围。确定一个实验性集成点和一个可衡量的 IDE 性能场景；完成后应能证明对于大量使用 barrel 的 TypeScript 代码，性能有所提升，同时不改变运行时行为。