ChangeMap

Know what breaks before you change your code.

Local impact analysis for JavaScript and TypeScript. ChangeMap indexes your project on your machine and shows what a change affects — files, functions, tests — with evidence. No cloud. No telemetry. No LLM inside the extension.

Requirements

Node.js 22+ on your PATH (or set changemap.nodePath). VS Code / Cursor’s Electron Node 20 cannot run the CLI (node:sqlite).

This extension does not bundle the engine. Install @changemap/cli from npm, then the extension locates it in this order:

1. changemap.cliPath if you set it to that package’s dist/index.js
2. node_modules/@changemap/cli in the open workspace (npm install -D @changemap/cli)
3. A changemap executable on PATH (npm install -g @changemap/cli)
4. packages/cli in this repository (ChangeMap maintainers only)

The CLI always runs under Node 22+ (changemap.nodePath), never under Cursor, VS Code, or Electron.

Commands

• ChangeMap: Initialize Workspace
• ChangeMap: Analyze Impact (editor / explorer)
• ChangeMap: Analyze Workspace Impact
• ChangeMap: Show Dependents / Show Dependencies
• ChangeMap: Update Index

Settings: changemap.cliPath, changemap.nodePath, changemap.codeLens.

Cursor vs VS Code

Install from the Visual Studio Marketplace in VS Code (changemap.changemap-vscode). In Cursor, install from Open VSX (same publisher/extension id) or Install from VSIX. A Marketplace listing does not automatically appear in Cursor.

MCP for agents: npx -y @changemap/mcp with CHANGEMAP_NODE set to Node 22+. Do not point MCP at a git checkout.

License: proprietary — see LICENSE (proposed / not lawyer-reviewed). The source repository is private.