Fourmolu

Current release: v0.16.2.0

Fourmolu is a formatter for Haskell source code. It is a fork of Ormolu, with upstream improvements continually merged. Fourmolu can be seen as a less-opinionated version of Ormolu: Ormolu implements “one true formatting style”, whereas Fourmolu is configurable. Try it out below!

Formatting options

indentation column-limit function-arrows comma-style import-export-style indent-wheres record-brace-space newlines-between-decls haddock-style haddock-style-module let-style in-style single-constraint-parens single-deriving-parens unicode respectful import-grouping sort-constraints sort-derived-classes sort-deriving-clauses

Program options

Check idempotence Unsafe mode Format as backpack signature

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