Node script to perform find/replace of Font Awesome icon from v4 to v5

font-awesome-upgrade-4-5.js

const fs = require('fs');
const path = require('path');

// Sourced from https://fontawesome.com/how-to-use/on-the-web/setup/upgrading-from-version-4#name-changes
const changes = fs.readFileSync('icon-changes.csv', 'utf8');
const icons = changes.split('\r\n');
const OLD_PREFIX = 'fa fa-';

const ROOT_FOLDER = 'src';
const DRY_RUN = true;

function traverseDirs(dir) {
    fs.readdir(dir, { withFileTypes: true }, (err, files) => {
        if (err) {
            throw err;
        }

        files.forEach(file => {
            const pathToFile = path.join(dir, file.name);

            if (file.isDirectory()) {
                traverseDirs(pathToFile);
                return;
            }

            fs.readFile(pathToFile, 'utf8', (err, fileContents) => {
                if (err) {
                    throw err;
                }

                icons.forEach(iconUpgrade => {
                    const [fromName, toName, newPkg] = iconUpgrade.split(',');
                    const find = new RegExp(OLD_PREFIX + fromName, 'g');
                    const replace = newPkg + ' fa-' + toName;

                    if (fileContents.match(find)) {
                        console.log('Found', OLD_PREFIX + fromName, 'in', pathToFile);
                        console.log('Replace with', replace);
                        console.log('--------');

                        if (!DRY_RUN) {
                            fs.writeFileSync(pathToFile, fileContents.replace(find, replace));
                        }
                    }
                });
            });
        });
    });
}

traverseDirs(ROOT_FOLDER);

icon-changes.csv