reasonml / reasonml/reason

Multi argument function definition formatting with refmt

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KIND: FEATURE REQUEST Printer
Dominant language
OCaml
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Description

Can refmt adopt the Facebook style for multi argument function definitions. It currently formats such functions as:

let withLatestFrom =
    (~selector: ('a, 'b) => 'c, other: Observable.t('b))
    : Operator.t('a, 'c) =>

In most Facebook codebases (both Hack and JS) you would see this formatted as:

let withLatestFrom =(
  ~selector: ('a, 'b) => 'c, 
   other: Observable.t('b),
): Operator.t('a, 'c) =>

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with refmt's formatting path for multi-argument function definitions and reproduce the issue's input and current output. Compare it with the requested Facebook-style output; the work is done when refmt consistently emits the requested layout for this form.

Written by the indexing model from the issue text.

Assessment

Tech stack
ocaml
Domain
tooling
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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