Simple example of how to create an ES5 Promise. 

// A. If no dirPath exists, use a default.
var dirPath = (dirPath) ? dirPath: `${process.cwd()}/html/raw/`;

let promise = await new Promise( async (resolve, reject) => {
    // B. Prepend absolute directory path to the beginning of each array element
    let array =  fs.readdirSync(dirPath).map(filePaths => { return `${dirPath}${filePaths}` })
    // C. Remove hidden files
    .filter(Utils.isNotUnixHiddenPath)
    // D. Remove directories and other non-files.
    .filter(Utils.isFile)
    // E. Success
    resolve( array );
})
.then( response => { return response } )
.catch( err => console.error(err) );

return promise;