rename-ext.js

// yarn add fs-extra glob

const { promisify } = require('util');
const glob = promisify(require('glob'));
const fse = require('fs-extra');
const path = require('path');

async function replace(ext, newExt) {
    const pattern = path.resolve(__dirname, `**/*.${ext}`);
    const filenames = await glob(pattern);

    const promises = filenames.map(filename => {
        const reg = new RegExp(`\\.${ext}$`);
        const newFilename = filename.replace(reg, `.${newExt}`);
        console.log(filename)
        console.log(newFilename)
        console.log('--------------------------------')
        return fse.rename(filename, newFilename);
    });

    await Promise.all(promises);

    console.log('[DONE]');
}

replace('ttss', 'wxss');