TypL
A configurable type linter for JavaScript using standard syntax and heavy type inferencing.
What is TypL?
TypL is a type linter for JavaScript that provides optional type annotations to verify value-type compatibility and prevent bugs. It uses standard ES6 template tag syntax and emphasizes type inferencing, allowing type checking on existing JS programs without code changes. Unlike TypeScript or Flow, it functions as a configurable linter rather than a typed-language variant.
JavaScript developers who want optional, configurable type checking without committing to a full typed-language variant, especially those working with existing codebases.
Developers choose TypL for its flexibility and control—it uses standard JS syntax, requires no compilation step, and allows customizable type rules like ESLint, making it ideal for gradual adoption and existing projects.
Overview
The Type Linter for JS
Use Cases
Best For
- Adding optional type checking to existing JavaScript codebases without refactoring
- Developers who prefer configurable type rules over rigid type systems
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