TypeScript Definition Finder MCP Server
About
A Model Context Protocol (MCP) server that helps AI code editors find TypeScript symbol definitions in your codebase.
Details
- Author
- runninghare
- Downloads
- 212
- Categories
- Other
Jump to
- Finds original definitions of TypeScript symbols
- Works with imported symbols from external packages
- Returns both the definition location and code snippet
- Supports stdio interface for AI code editor integration
- Trigger command /ts-def available in Cursor
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
TypeScript Definition Finder MCP ServerCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
Install via Smithery (npx -y @smithery/cli install @runninghare/ts-def-mcp --client claude) or manually with bun install and bun run build. Start the server with node dist/run.js. Use the tool find_typescript_definition (trigger /ts-def) with parameters file_path, line_content, and column_number.
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"typescript definition finder mcp server": {
"ts-def-mcp": {
"command": "npx",
"args": [
"-y",
"@smithery/cli",
"install",
"@runninghare/ts-def-mcp",
"--client",
"claude"
]
}
}
}
}McpServers
{
"ts-def-mcp": {
"command": "npx",
"args": [
"-y",
"@smithery/cli",
"install",
"@runninghare/ts-def-mcp",
"--client",
"claude"
]
}
}TypeScript Definition Finder MCP Server
A Model Context Protocol (MCP) server that helps AI code editors find TypeScript symbol definitions in your codebase. This tool is particularly useful when you need to locate the original definition of imported symbols, classes, interfaces, or functions in a TypeScript project.
Features
- Finds original definitions of TypeScript symbols
- Works with imported symbols from external packages
- Returns both the definition location and code snippet
- Supports stdio interface for seamless integration with AI code editors
Prerequisites
- Bun v1.2.2 or later
- Node.js for running the compiled server
Installation
Installing via Smithery
To install TypeScript Definition Finder for Claude Desktop automatically via Smithery:
npx -y @smithery/cli install @runninghare/ts-def-mcp --client claude
Manual Installation
1. Install dependencies:bun install
2. Build the project:
bun run build
Usage
Start the stdio server:
node dist/run.js
Tool Description
The server provides a find_typescript_definition tool with the following capabilities:
- Tool Name: find_typescript_definition
- Trigger Command: /ts-def (Useful in Cursor if you want to force AI editor to find the referenced symbol definition)
- Purpose: Locates the original definition of TypeScript symbols in your codebase
Input Parameters
The tool requires three parameters:
1. file_path (string):
- The absolute path to the current TypeScript file
- Example: /path/to/your/project/src/index.ts
2. line_content (string):
- The entire line containing the symbol you want to find the definition of
- Used to locate the correct line in the file
- Must match the line exactly as it appears in the file
3. column_number (number):
- The 1-based column number where the symbol starts
- Must be the exact column position of the symbol's first character
Examples
1. Finding an Imported Symbol Definition
Given this import statement:
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
To find the definition of
StdioServerTransport, which starts at column 10, you would use:{
"file_path": "~/my-mcp-project/src/index.ts",
"line_content": "import { StdioServerTransport } from \"@modelcontextprotocol/sdk/server/stdio.js\";",
"column_number": 10
}
The output of this tool will be:
[
{
"file": "~/my-mcp-project/node_modules/@modelcontextprotocol/sdk/dist/esm/server/stdio.d.ts",
"type": "Definition",
"location": "Line 9, Column 22",
"codeSnippet": " 8 /\n 9 > export declare class StdioServerTransport implements Transport {\n 10 + private _stdin;\n 11 + private _stdout;\n 12 + private _readBuffer;\n 13 + private _started;\n 14 + constructor(_stdin?: Readable, _stdout?: Writable);\n 15 + onclose?: () => void;\n 16 + onerror?: (error: Error) => void;\n 17 + onmessage?: (message: JSONRPCMessage) => void;\n 18 + _ondata: (chunk: Buffer) => void;\n 19 + _onerror: (error: Error) => void;\n 20 + /\n 21 + Starts listening for messages on stdin.\n 22 + /\n 23 + start(): Promise<void>;\n 24 + private processReadBuffer;\n 25 + close(): Promise<void>;\n 26 + send(message: JSONRPCMessage): Promise<void>;\n 27 }\n"
}
]
2. Finding a Local Symbol Definition*
For a local class usage:
class MyService {
private transport: StdioServerTransport;
}
To find the definition of
StdioServerTransport, which starts at column 20, use:{
"file_path": "/path/to/project/src/service.ts",
"line_content": " private transport: StdioServerTransport;",
"column_number": 20
}
Response Format
The tool returns a JSON response containing:
- The file path where the definition was found
- The line number of the definition
- The actual code snippet of the definition
Claude Desktop Example
Development
This project was created using bun init in bun v1.2.2. Bun is a fast all-in-one JavaScript runtime.
Running in Development Mode
For development, you can run the server directly using Bun:
bun run index.ts
License
[Add your license information here]
Contributing
[Add contribution guidelines here]
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