flow

Flow allows incremental addition of type annotations to existing JavaScript code, enabling teams to transition without a full rewrite, as emphasized in its philosophy of gradual typing.

It automatically infers types from code, reducing the need for explicit annotations and boilerplate, which is a key feature mentioned in the documentation.

Flow works with existing JavaScript and popular frameworks, ensuring no breaking changes and seamless integration, as highlighted in its compatibility features.

The flow-parser module provides a standalone parser for JavaScript tooling integration, useful for custom development tools, as noted in the README.