Here’s the Deal

Utrecht Haskell Compiler vs Flow

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When comparing Utrecht Haskell Compiler vs Flow, the Slant community recommends Utrecht Haskell Compiler for most people. In the question“What are the best solutions to "The JavaScript Problem"?” Utrecht Haskell Compiler is ranked 17th while Flow is ranked 32nd. The most important reason people chose Utrecht Haskell Compiler is:

No need to learn any new semantics, it's just a switch to a different compiler.

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Common Questions

What are the best solutions to "The JavaScript Problem"?

Pros

Pro
It's just Haskell

No need to learn any new semantics, it's just a switch to a different compiler.

Pro
Flexible FFI

UHC uses a printf-like syntax for its FFI, which is flexible enough to minimize the need for wrapper functions, when, e.g., calling methods on objects. It also supports %*, for working with functions that take arbitrary parameters, such as concat.

UHC also has support for wrapper imports and dynamic imports, for passing Haskell functions as callbacks to Javascript, or dealing with curried Javascript functions, respectively.

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.

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Cons

Con
No support for Language Extensions

No support for things like Arrow Syntax - this is particularly a disadvantage when compared to options like Elm (which was designed around good syntax for Arrowized FRP), if you're looking to do Functional Reactive front-end development.