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rescript-react-intl-extractor

Extracts messages for localization from ReScript source files. Also supports the legacy Reason syntax.

This assumes that you are using the rescript-react-intl bindings for react-intl.

Installation

Binaries for macOS, Linux and Windows can be installed via npm or yarn. For global installation, run

npm install -g rescript-react-intl-extractor-bin

Alternatively, the binaries are also available for download on the releases page.

Usage

rescript-react-intl-extractor [--allow-duplicates] [path...]

where path is a ReScript (*.res) or Reason (*.re) source file or a directory containing such source files. Multiple files/directories may be specified.

The --allow-duplicates option allows messages with identical id props if the defaultMessage props are identical as well.

Output

The output (a JSON array of all extracted messages sorted by id) is written to stdout. It will look like this:

[
  {
    "id": "message.hello",
    "defaultMessage": "Hello"
  },
  {
    "id": "message.world",
    "defaultMessage": "World"
  },
  {
    "id": "some.message.id",
    "defaultMessage": "Some message"
  }
]

Message Definition (ReScript Syntax)

Formatted messages may be defined in your source files in one of the following ways:

1. inline in FormattedMessage:

<ReactIntl.FormattedMessage id="some.message.id" defaultMessage="Some message" />

or

open ReactIntl
...
<FormattedMessage id="some.message.id" defaultMessage="Some message" />

2. within a module with the [@intl.messages] attribute:

open ReactIntl

module Msg = {
  @@intl.messages

  let hello = {id: "message.hello", defaultMessage: "Hello"}
  let world = {id: "message.world", defaultMessage: "World"}
}

You also can pass descriptions to the records with:

let foo = @intl.description("Hello description") {id: "message.hello", defaultMessage: "Hello"}

Message Definition (Legacy Reason Syntax)

Formatted messages may be defined in your source files in one of the following ways:

1. inline in FormattedMessage:

<ReactIntl.FormattedMessage id="some.message.id" defaultMessage="Some message" />

or

open ReactIntl;
...
<FormattedMessage id="some.message.id" defaultMessage="Some message" />

2. within a module with the [@intl.messages] attribute:

open ReactIntl;

module Msg = {
  [@intl.messages];

  let hello = {id: "message.hello", defaultMessage: "Hello"};
  let world = {id: "message.world", defaultMessage: "World"};
};

You also can pass descriptions to the records with:

let foo = [@intl.description "Hello description"] {id: "message.hello", defaultMessage: "Hello"};

3. within intl-ppx ⚠ ReScript team recommends not to use PPXes

let hello = [%intl "hello"]
let world = [%intl {msg: "world", desc: "Some description"}]

Building and Testing

The ReScript parser is included as a git submodule. Therefore, after checking out the sources, first run

git submodule update --init --recursive

Install Ocaml and OPAM, and create an OPAM switch with OCaml version 4.06.1.

Then run

opam pin add rescript-react-intl-extractor.dev . --no-action
opam install . --deps-only --with-doc --with-test

To build the project, run

opam exec -- dune build

To run the tests, do

opam exec -- dune runtest