A Visual Studio Code extension for visualizing dependencies between ReScript modules in your project. This extension helps you understand the structure and relationships in your ReScript codebase.
Features
Full Dependency Graph Visualization: View the complete dependency graph of your ReScript project
Module-Focused Views: Focus on a specific module and see its direct dependencies and dependents
Unused Module Detection: Identify modules that have no dependents to help locate potential dead code
Interactive Graph: Click on modules to navigate through dependencies
Value Usage Count: See how many times each let binding is used, directly in the editor
High Performance: Uses digest-based caching to improve performance for large projects
Value Usage Count Annotation
This extension also shows how many times each value (e.g., a function or let binding) is used across your project. When you place your cursor on a let ... = declaration in a .res file, an inline annotation will appear at the end of the line, such as Used 0 times. This helps you quickly identify unused or rarely used values.
Platform Support
Currently, this extension is supported on:
macOS
Linux
Important: Windows is not supported in the current version.
Windows support is planned for a future release. The limitation is due to issues with the CLI binary build process.
Commands
This extension provides several commands in the Command Palette (Ctrl+Shift+P or Cmd+Shift+P):
ReScript: Show Dependency Graph: Shows the full dependency graph of your project
ReScript: Focus On Module Dependencies: Focuses on a specific module and its relationships
ReScript: Show Unused Modules: Identifies and visualizes modules that have no dependents (potentially unused code)
ReScript: Clear Dependency Cache: Clears the cached dependency data for improved accuracy after major changes
Requirements
A ReScript project (with either bsconfig.json or rescript.json configuration file)
Compiled output in the lib/bs directory
Platform: macOS or Linux (Windows is not supported in the current version)
Installation
Install the extension from the VS Code Marketplace
Open a ReScript project in VS Code
Use the Command Palette to run the dependency visualization commands
Usage Tips
After Major Changes: When making significant changes to your codebase (including module deletion), run rescript clean to recompile your project for improved analysis accuracy
Module Navigation: Click on any module in the visualization to focus on that module
Extension Settings
This extension doesn't require any specific settings.
Known Issues
Windows platform is not supported in the current version
Please report any issues on the GitHub repository
Release Notes
0.8.0
Show value usage count as an inline annotation for let bindings.
0.7.0
Added new command "ReScript: Show Unused Modules" to display modules without dependents
Enhanced visualization with special highlighting for unused modules
Improved user interaction for large projects with options to switch between view modes
Added visual indicators and tooltips for unused modules to help identify dead code
0.6.0
Improved dependency graph rendering with optimized layout algorithms
Added support for filtering modules by namespace
Improved error handling for invalid project configurations
0.5.0
Added monorepo support: The extension now detects and works with monorepo projects containing multiple ReScript packages
Improved visualization with better node positioning and relationship indicators
Enhanced module focus mode with clearer dependency direction highlighting
0.4.0
Added AST-based dependency analysis for more accurate module dependency detection
Significantly improved performance with optimized caching and parallel processing
Reduced memory usage through efficient data structures and lazy loading
0.3.0
Added dark theme support: The dependency graph visualization now automatically adapts to your VS Code theme
0.2.0
Added external module visualization: Now properly represents external dependencies in the dependency graph
0.1.1
Fixed compatibility issue by downgrading the VS Code engine requirement to support older VS Code versions
