Sed script to add "use strict"; to the top of JavaScript files

use-strict.sed

#
# Sed script to add "use strict"; to the top of files that don't
# already have it there.
#
# use like this: find . -name \*.js | xargs -n 1 sed -f make-strict.sed -i ''
#
1 { s/use strict/&/
t
i\
"use strict";
x
G
}