async function writeFileInDev(path, content) {
    await outputFile(path, content, 'utf8');

    /**
     * hack for watchpack, solve the rebuilding problem in dev mode
     * https://github.com/webpack/watchpack/issues/25#issuecomment-287789288
     */
    let then = Date.now() / 1000 - 10;
    await utimes(path, then, then);
}
write files to disk in dev mode

@param {string} path file path
@param {string} content file content