extract-translation-keys-webpack/loader.js

var fs = require('fs');
var crypto = require('crypto');

const getParams = query => {
  if (!query) {
    return { };
  }

  return (/^[?#]/.test(query) ? query.slice(1) : query)
    .split('&')
    .reduce((params, param) => {
      let [ key, value ] = param.split('=');
      params[key] = value ? decodeURIComponent(value.replace(/\+/g, ' ')) : '';
      return params;
    }, { });
};


module.exports = function(source) {

    const params = getParams(this.query);


    const chunk = crypto.createHash('md5').update(this.resource).digest("hex");

    if (params.path === undefined) {
        this.emitError('path parameter must be provided');
    }

    if(this.cacheable) this.cacheable();

    const regex = /<translate(\s*.*)>(.*)<\/translate>/mg;
    let data = {}

    // replace all <translate param="value">Something</translate> into <span param="value">{this.props.p.t('Something')}</span>
    const result = source.replace(regex, function(match, p1, p2) {
        const md5 = crypto.createHash('md5').update(p2).digest("hex");
        data[md5] = p2;
        if(p1.trim() == 'span') {
            return "<span"+p1+">{this.props.p.t('"+md5+"')}</span>";
        } else if (p1.trim() == 'nojsx') {
            return "this.props.p.t('"+md5+"')";
        } else {
            return "{this.props.p.t('"+md5+"')}";
        }
    });

    const path = params.path+"/_"+chunk+".json";

    if (Object.keys(data).length !== 0) {

        fs.writeFile(path, JSON.stringify(data), function(err) {
            if(err) {
                return console.log(err);
            }
        });
    }

    return result;
};