EEXIST: file already exists, mkdir

[Darker]

I encountered this issue when trying to copy two batches of files at the same time:

// My promise wrapper
function ncpAsync(src, dst, options) {
    return new Promise(function (resolve, reject) {
        ncp(src, dst, options, function (err) {
            if (err) {
                if (typeof err == "string")
                    err = new Error(err);
                reject(err);
            }
            else
                resolve();
        })
    });
}

const copyPromises = [
    ncpAsync("./web/", "./release_package/web/", {
        filter: function (f) {
            const stat = fs.lstatSync(f);
            return stat.isDirectory() || f.endsWith(".html");
        },
        // This works
        transform: function (read, write) {
            read
                .pipe(stream.replace(/<script +type="module" +src="(\.\/)?main\.js" *>/ig, "<script type=\"text/javascript\" src=\"dozor.min.js\">"))
                .pipe(write);
        }
    }),
    ncpAsync("./web/", "./release_package/web/", {
        filter: function (f) {
            console.log(" COPY FILE: ", f);
            return !f.endsWith(".html");
        }
    }),
];

try {
    await Promise.all(copyPromises);
}
catch (e) {
    console.log("Copy FAILED!");
    throw e;
}

The errors:

ERROR(0,0): Error : EEXIST: file already exists, mkdir '*CENSORED*\release_package\web\error'
    errno: -4075,
    code: 'EEXIST',
    syscall: 'mkdir',
    path: '*CENSORED*\\release_package\\web\\error' },
EXEC(0,0): Error : EEXIST: file already exists, mkdir '*CENSORED*\release_package\web\img'
    errno: -4075,
    code: 'EEXIST',
    syscall: 'mkdir',
    path: '*CENSORED*\\release_package\\web\\img' },
EXEC(0,0): Error : EEXIST: file already exists, mkdir '*CENSORED*\release_package\web\lib'
    errno: -4075,
    code: 'EEXIST',
    syscall: 'mkdir',
    path: '*CENSORED*\\release_package\\web\\lib' } ]

The copying only overlaps with the directories - otherwise both groups of files are different - HTML files are copied separately and transformed. Other files are not being transformed.