trim-locales.js

var diff = require('deep-diff');
const _ = require('lodash');
const fs = require('fs');

let isObject = function (a) {
    return !!a && a.constructor === Object;
};
function removeEmpty(obj) {
    return Object.entries(obj)
        .filter(([_, v]) => v != null && v != '')
        .reduce((acc, [k, v]) => ({ ...acc, [k]: isObject(v) ? removeEmpty(v) : v }), {});
}

const enTranslationFile = './src/i18n/locales/en.json';
const enTranslations = require(enTranslationFile);

const ignoredFiles = ['localeNames.json', 'en.json'];
const localesDir = './src/i18n/locales';
const files = [];
const dir = fs.opendirSync(localesDir);
let dirent;
while ((dirent = dir.readSync()) !== null) {
    if (!ignoredFiles.includes(dirent.name)) {
        files.push(dirent.name);
    }
}
dir.closeSync();

for (const file of files) {
    const localeFileName = `./src/i18n/locales/${file}`;
    const translations = require(localeFileName);
    const diffR = diff(enTranslations, translations);

    let newTranslation = {};
    diffR.forEach((d) => {
        switch (d.kind) {
            case 'E':
                _.set(newTranslation, d.path, d.rhs);
                break;
        }
    });
    newTranslation = removeEmpty(newTranslation);
    console.log(`Trimmed ${localeFileName}`);
    fs.writeFileSync(localeFileName, JSON.stringify(newTranslation, null, 4));
}