Support parameter hints in hh_client LSP

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#8,199 opened on May 14, 2018 1 comment 0 reactions 0 assignees View on GitHub

feature request hack

Dominant language: C++
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Description

### HHVM Version
Any

### Operating System and Version
Any

### Standalone code, or other way to reproduce the problem

Hack typechecker just added support for signature help in the latest version (https://github.com/facebook/hhvm/commit/7874525f86ad1621d5f8e5a5f23d318b861ebc46). While this shows function/parameter signature when typing, it can also further annotate the hint using documentation:

1. Description can be shown during hover. TypeScript example:
![image](https://user-images.githubusercontent.com/341507/40014480-8c760f7e-5765-11e8-98e5-e92b0b28aed3.png)

2. Specific parameter description can be shown during completing by parsing `@param` comments. TypeScript example:

![image](https://user-images.githubusercontent.com/341507/40014545-b1d425a8-5765-11e8-8b2b-70bdcd393a40.png)
![image](https://user-images.githubusercontent.com/341507/40014555-b6f68738-5765-11e8-9468-a5cd48a93ccc.png)

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Support parameter hints in hh_client LSP

Description

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