LSP Example

Heavily documented sample code for https://code.visualstudio.com/api/language-extensions/language-server-extension-guide

Functionality

This Language Server works for plain text file. It has the following language features:

Completions
Diagnostics regenerated on each file change or configuration change

It also includes an End-to-End test.

Structure

.
├── client // Language Client
│   ├── src
│   │   ├── test // End to End tests for Language Client / Server
│   │   └── extension.ts // Language Client entry point
├── package.json // The extension manifest.
└── server // Language Server
    └── src
        └── server.ts // Language Server entry point

Running the Sample

Run npm install in this folder. This installs all necessary npm modules in both the client and server folder
Open VS Code on this folder.
Press Ctrl+Shift+B to start compiling the client and server in watch mode.
Switch to the Run and Debug View in the Sidebar (Ctrl+Shift+D).
Select Launch Client from the drop down (if it is not already).
Press ▷ to run the launch config (F5).
In the Extension Development Host instance of VSCode, open a document in 'plain text' language mode.
- Type j or t to see Javascript and TypeScript completion.
- Enter text content such as AAA aaa BBB. The extension will emit diagnostics for all words in all-uppercase.