i18next-scanner.config.js

var fs = require('fs')
var chalk = require('chalk')

module.exports = {
  input: [
    'src/**/*.{js,jsx}',
    // Use ! to filter out files or directories
    '!src/**/*.spec.{js,jsx}',
    '!src/i18n/**',
    '!**/node_modules/**'
  ],
  output: './',
  options: {
    debug: true,
    func: {
      list: ['i18next.t', 'i18n.t'],
      extensions: ['.js', '.jsx']
    },
    trans: {
      component: 'Trans',
      i18nKey: 'i18nKey',
      defaultsKey: 'defaults',
      extensions: ['.js', '.jsx'],
      fallbackKey: function(ns, value) {
        return value
      },
      acorn: {
        ecmaVersion: 10, // defaults to 10
        sourceType: 'module' // defaults to 'module'
        // Check out https://github.com/acornjs/acorn/tree/master/acorn#interface for additional options
      }
    },
    lngs: ['en-US', 'de', 'it', 'fr', 'pt-PT', 'pt-BR'],
    ns: ['locale', 'resource'],
    defaultLng: 'en-US',
    defaultNs: 'resource',
    resource: {
      loadPath: 'i18n/{{lng}}/{{ns}}.json',
      savePath: 'i18n/{{lng}}/{{ns}}.json',
      jsonIndent: 2,
      lineEnding: '\n'
    },
    nsSeparator: false, // namespace separator
    keySeparator: false, // key separator
    interpolation: {
      prefix: '{{',
      suffix: '}}'
    },
    context: false,
    plural: false
  },
  transform: function customTransform(file, enc, done) {
    'use strict'
    const parser = this.parser
    const content = fs.readFileSync(file.path, enc)
    let count = 0
    parser.parseFuncFromString(
      content,
      (key, options) => {
        if (options.count) {
          options.defaultValue = `{count, plural, one {1 ${key}} other {{count} ${key}}}` // use key as the value
        } 
        parser.set(key, options);
        ++count
      },
      { list: ['i18next._', 'i18next.__'] }
    )

    if (count > 0) {
      console.log(
        `i18next-scanner: count=${chalk.cyan(count)}, file=${chalk.yellow(
          JSON.stringify(file.relative)
        )}`
      )
    }

    done()
  }
}