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• "Flow - Am I Your Type?" by Mark Volkmann. Sept. 2017.
• flow-typed

Flow is an open source tool written in OCaml from Facebook that is "a static type checker, designed to find type errors in JavaScript programs". Its parser is available as a compiled-to-JavaScript module published to npm, named flow-parser. JavaScript packages which make use of parsing Flow-typed JavaScript can use this to generate Flow's syntax tree with annotated types attached.

Flow supports adding types gradually to variables, parameters, return values, object properties, and array elements. Flow even catches some errors without adding types by using type inference and flow analysis.

Flow supports many types including primitives, functions (with specified signatures), arrays, objects, built-in classes, custom classes, and generic (parameterized) classes.

Flow is similar to Microsoft TypeScript and mostly uses the same syntax for specifying types. However, TypeScript is also a transpiler. One benefit of using Flow is that Babel can be used for transpiling. Babel typically implements new ECMAScript features before TypeScript.

This talk covers everything you need to know to get started using Flow, including integration with Babel, ESLint, editors, and IDEs.

Mark Volkmann OBJECT COMPUTING, INC.

Mark Volkmann is a partner at Object Computing, Inc. (OCI) in St. Louis where he has provided software consulting and training since 1996. As a consultant, Mark has assisted many companies with JavaScript, Node.js, React, AngularJS, jQuery, and Java application development. He has created and taught many courses on topics including React, AngularJS, Node.js, jQuery, JavaScript, HTML5, CSS3, Ruby, Java, and XML. Mark is a frequent presenter at St. Louis area user groups. He has written for XML Journal and the No Fluff Just Stuff magazine. He has presented at the MidwestJS, Jfokus, Strange Loop, No Fluff Just Stuff, and XML DevCon conferences. Mark frequently writes articles on various software development topics. These can be found at https://objectcomputing.com/resources....

The Flow type checker developed by Facebook (now Meta) is still an active project in 2024. However, its popularity and community activity have declined in comparison to TypeScript. Flow is still maintained and used internally by Meta for some of its projects, but the broader JavaScript/TypeScript community has largely gravitated towards TypeScript due to its comprehensive feature set, community support, and integration with the broader JavaScript ecosystem.

As of my last update in May 2024, the Flow type checker developed by Facebook (now Meta) is still an active project. However, its popularity and community activity have declined in comparison to TypeScript. Flow is still maintained and used internally by Meta for some of its projects, but the broader JavaScript/TypeScript community has largely gravitated towards TypeScript due to its comprehensive feature set, community support, and integration with the broader JavaScript ecosystem.

1. Official GitHub Repository: Check the Flow GitHub repository for the latest commits, releases, and issues. This will give you a clear picture of its current activity and support.
2. Flow Documentation: The official Flow documentation is another resource to see the latest updates and guides.