Error: EACCES: permission denied using webpack

As Camp bell mentioned you need to remove forward slash before dist folder in the output path section.

In my case I had to remove forward slash before build. Check my example below

Wrong one:

output: {
    path: path.resolve(__dirname, "/build/"), //remove forward slash here
    publicPath: "/",
    filename: "bundle.js"
}

Correct one:

output: {
    path: path.resolve(__dirname, "build/"),
    publicPath: "/",
    filename: "bundle.js"
}

Hope this helps.