Laravel npm run dev error

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I have also noticed that there is a missing slash "/" in the output directory.

// JS pages (single page use)
(glob.sync(`${dir}/js/custom/**/*.js`) || []).forEach(file => {
    var output = `public/assets${file.replace(path.normalize(dir), '')}`;
    mix.scripts(file, output);
});

should be

var output = `public/assets/${file.replace(path.normalize(dir), '')}`;