I would rethink this 

# show no warnings about recursion (we know what we do  )
no warnings "recursion";

[download]

You can replace that with

use File::Find::Rule;
my @jsfiles = find( file => name => qr{\.js$} => in => $searchdir );

Or even the iterator version (if you have thousands of files), example in Re^2: Write to existing file with character insert

In reply to Re^4: Hacking of JavaScript files in our corporate website by Anonymous Monk
in thread Hacking of JavaScript files in our corporate website by shajiindia

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