TypeScript LSP

TypeScript/JavaScript language server integration providing comprehensive code intelligence through typescript-language-server.

Capabilities

• Type checking: Static analysis of TypeScript and JavaScript types
• Code intelligence: Autocomplete, go-to-definition, find references, rename symbols
• Error detection: Real-time diagnostics for type errors, syntax issues, and semantic problems
• Refactoring: Extract function/variable, organize imports, quick fixes
• Supported extensions: .ts, .tsx, .js, .jsx, .mts, .cts, .mjs, .cjs

Installation

Install TypeScript language server and TypeScript compiler:

npm install -g typescript-language-server typescript

Or with yarn:

yarn global add typescript-language-server typescript

Verify installation:

typescript-language-server --version
tsc --version

Usage

The language server runs automatically in LSP-compatible editors. For manual type checking:

tsc --noEmit  # Type check without generating output files

Compile TypeScript files:

tsc src/index.ts

Watch mode for continuous type checking:

tsc --watch --noEmit

Configuration

Create tsconfig.json in project root:

{
  "compilerOptions": {
    "target": "ES2020",
    "module": "ESNext",
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "resolveJsonModule": true,
    "moduleResolution": "node"
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules", "dist"]
}

Integration Pattern

When editing TypeScript/JavaScript code:

1. Run tsc --noEmit after significant changes
2. Address type errors before committing
3. Use tsc --watch during active development
4. Leverage quick fixes for common issues

Common Flags

• --noEmit: Type check only, no output files
• --strict: Enable all strict type checking options
• --watch: Watch mode for continuous compilation
• --project <path>: Specify tsconfig.json location
• --pretty: Stylize errors and messages

More Information

• typescript-language-server on npm
• GitHub Repository
• TypeScript Official Documentation
• TypeScript Compiler Options