ftl-tx

Simple library that converts .ftl to/from structured JSON with ICU Messages that Transifex can understand.

It has many limitations (see below).

Usage

import { ftlToJSON, JSONToFtl } from 'ftl-tx';
const ftl = `message = Hello, { $user }!`;
console.assert(JSONToFtl(ftlToJSON(ftl)).trim() === ftl);
console.log(ftlToJSON(ftl));

See tests/translate.test.js for various use cases.

Limitations

A limited set of features is supported, specifically:

• attributes are translated into new messages, with the attribute name concatenated with the message key to create a new message key
• fluent functions (including built-in functions) will be correctly transcoded to ICU and back, including when used as selectors, but obviously won't work in ICU format.
• message referencing is not supported
• terms are converted to variables, prefixed with FTLREF_ and with "-" replaced as "_"
• All comments are ignored, except for message-bound comments prefixed tx:
• Message nesting level is limited to 10 levels (using a variable/reference inside a variant value "costs" 0.5 level). This value is configurable and can be increased at a slight performance cost

Configuration

• addTermsToFTL, whether to include terms in produced FTL file, defaults to true
• commentPrefix, prefix used for comments, defaults to tx:
• nestLimit, maximum message nesting level, defaults to 10
• skipRefOnly, whether to exclude from JSON output messages that only include a reference (to another message or to a term/variable)
• skipTerms, whether to exclude terms from JSON output

Examples

See tests/translate.test.js for examples.