Recursively scans all files within a folder
https://stackoverflow.com/questions/5827612/node-js-fs-readdir-recursive-directory-search
Array of paths
Folder to scan
Optional
found files will be appended to this array
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Recursively scans all files within a folder
Remarks
https://stackoverflow.com/questions/5827612/node-js-fs-readdir-recursive-directory-search
Returns
Array of paths