merge.js

// https://stackoverflow.com/a/40022630
const fs = require('fs');
const glob = require('glob');

const output = {};
const outputPath = './snippets/';

glob('src/**/*.json', (error, files) => {
    try {
        fs.existsSync(outputPath) || fs.mkdirSync(outputPath);

        fs.accessSync(outputPath, fs.constants.R_OK | fs.constants.W_OK)

        // console.log(`${outputPath} exists, and it is writable`);

        files.forEach((filename) => {
            const contents = JSON.parse(fs.readFileSync(filename, 'utf8'));
            Object.assign(output, contents);
        });

        fs.writeFileSync(outputPath + 'javascript.json', JSON.stringify(output));

        console.log(`Complete! :)`);

    } catch (err) {
        console.error(`${outputPath} ${err.code === 'ENOENT' ? 'does not exist' : 'is read-only'}`);
        console.log('Failed! :(')
    }
});