When comparing Flow vs Mint, the Slant community recommends Mint for most people. In the question“What are the best solutions to "The JavaScript Problem"?” Mint is ranked 22nd while Flow is ranked 32nd. The most important reason people chose Mint is:
Crystal is one of the best and elegant languages.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Checks to see if you check for Nulls
Because getting those exceptions is just not fun and very pervasive.
Pro Versioned type definitions
Pro There is support in many code editors via the extension
For example, there is good support through the extension in Visual Studio Code, which is a good editor for TypeScript, which is a competitor to Flow.
Pro Babel extension for strip of type annotations
Thanks to the Babel extension for the output, there is minimally modified code that is understandable to the author.
Pro Statical analysing of JavaScript code
Statical analysing of JavaScript code without pre-making any changes to it. But supported annotation types by extending the syntax of the language.
Pro Writen in Crystal (Language)
Crystal is one of the best and elegant languages.
Pro Constructs for synchronous and asynchronous computations
Pro Easy to learn and write
Everything is an expression.
Pro HTML and CSS integration
HTML can be written with minimal differences.
Scoped .CSS can be written for elements in components.
Pro Good error support
200+ unique error messages to help you on the way.
Pro Everything is typed
Everything is typed using a simple type system
Pro Dead code elimination
Only used parts of the code compiles into the final bundle.
Pro Built-in formatter
Mint has a built-in formatter to format your code, it can run standalone or with the development server.
Pro Batteries included
Mint contains everything you need to build the frontend of web applications from styling to data storage through HTTP requests to testing.
Pro Integrated testing
Testing is part of the language and there is a test runner built in which runs tests in the browser.
Cons
Con Weak base type definitions even for popular JavaScript libraries
For example, there are definitions for Gulp, React.