Wren Language Extension
Visual Studio Code extension for the Wren programming language.
Features:
Syntax Highlighting
Syntax highlighting for Wren 0.4 (latest)
Document Outline & Symbols
Navigate your code with the outline panel. Classes, methods, constructors, subscript operators, and fields (collected from the methods) are listed hierarchically.
Code Completion
Context-aware autocompletion:
- Keywords —
class, construct, import, var, …
- Class names — all classes in the current file, imported modules, and the Wren library
- Static members — type
List. to see new(), filled(), etc.
- Instance methods — type
value. to see all known instance methods and properties (requires type-annotations)
- Constructors —
Fiber.new, Foo.new, …
Signature Help
Inline parameter hints appear as you type inside parentheses, showing all overloads with their parameter names.
Diagnostics
Real-time error and warning squiggles powered by an analysis pipeline (lexer → parser → resolver → (optional) type-checker). Catches syntax errors, unresolved variables, and type annotation warnings as you type.
Import Resolution
The extension follows import statements to discover classes across your project. It understands:
- Relative imports (
import "utils")
- Selective imports (
import "utils" for Helper, Config)
- Configurable search paths via
wren.additionalModuleDirectories
- Unresolved import warnings with squiggles on the import path or the class names when using selective imports
File Icons
Last but not least, two custom file icons for .wren sources in both light and dark themes. 
Configuration
wren.enableDiagnostics
Enable or disable analyzer diagnostics (type mismatches, unknown methods, wrong arity, unresolved imports). Default: true. Parse errors are always shown regardless of this setting.
wren.additionalModuleDirectories
An array of directories to search when resolving import statements.
- Relative paths are resolved per workspace folder
- Absolute paths work as-is (useful in global user settings for engine/framework modules)
Acknowledgements
Analysis powered by wren-analyzer, a TypeScript port of wrenalyzer by Bob Nystrom, extended with optional type-checking support.
Based on the Wren extensions by Johann Muszynski and Mike Rubits.
