Pre-populating gulp task

prepopulate-task.ts

/**
 * City population
 */
exports.cities = async () => {
    const options: Args = minimist<Args>(
        process.argv.slice(2),
        {
            string: ["dataDir"],
            default: { dataDir: "_data"}
        }
    );

    // 1. Create database
    const pathToNewDb = await cities(SCHEMA_PATH, options.dataDir);
    // 2. Copy to assets
    fs.copyFileSync(pathToNewDb, DST_PATH);
    // 3. Increment version
    incrementDatabaseVersion(VERSION_PATH, VERSION_KEY);
};