read with shared buffer

read.js

function readBytes(fd, sharedBuffer) {
    return new Promise((resolve, reject) => {
        fs.read(
            fd, 
            sharedBuffer,
            0,
            sharedBuffer.length,
            null,
            (err) => {
                if(err) { return reject(err); }
                resolve();
            }
        );
    });
}