I have around 100 .js files in my application. I need to find the unused functions from these files.
Which editor or tool can help me?
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1I dont' this there is a way to do it completely. Check this question : stackoverflow.com/questions/1167663/…Shoban– Shoban2009-07-23 06:58:45 +00:00Commented Jul 23, 2009 at 6:58
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1Possible duplicate of Is there a tool to remove unused methods in javascript?aug– aug2018-05-15 18:37:37 +00:00Commented May 15, 2018 at 18:37
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4 Answers
Give a look to the JSLint code quality tool.
answered Jul 23, 2009 at 6:10
Christian C. Salvadó
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Clemens
How does JSLint need to be configured to show warnings about unused functions?
You can do this using Jsure, a Javascript lint implementation. You'll be looking for the -unused-funs flag
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Necromancing for the sake of completeness:
On the frontend you can now use modern browsers' devtools, which now have the "Coverage" tab (at least Chromium-based do).
This tab allows you to "record" user activity for some time and then inspect which parts of JS files haven't been called/executed. Works for CSS too.
In dev tools press Ctrl + Shif + P to bring up the command bar, start typing "Cover.." and the "enable Coverage tab" will pop up. Then press "record" at the bottom area.
answered Jun 26, 2023 at 15:07
Alex from Jitbit
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I just created the following BASH script for listing all the JavaScript functions which are never called (I'm counting all the occurrences of the given JavaScript function name and if it occurs only once then I assume it's never used):
# the only shell parameter is the path to all ".js" files
echo "Processing content of \"`pwd`/$1\" folder..."
cd "$1"
echo "List of JavaScript functions which are defined but never used:"
JS_FUNCTIONS=`mktemp`
# assume that all JavaScript functions are in files with extension ".js" or ".Js" or ".JS"
# let's assume that all JavaScript functions' headers are on a single line, always starting with keyword "function" at the very beginning of the line
cat `find . -type f | grep -i '\.js'` | grep '^function' | sed 's/^function[ \t]\+//' | sed 's/[ \t]*(.*//' > $JS_FUNCTIONS
# if something is different in your case feel free to change the line above... ;)
MAX=`cat $JS_FUNCTIONS | wc -l`
for (( i = 1 ; i <= MAX ; i++ ))
do
JS_ITEM=`cat $JS_FUNCTIONS | head -$i | tail -1`
ITEM_COUNT=`grep -rn $JS_ITEM | grep -v '://' | wc -l` # use --exclude-dir for "grep" if you want to refine the search
if [ $ITEM_COUNT -lt 2 ]
then
echo " - $JS_ITEM()"
fi
done
rm $JS_FUNCTIONS
Just put it into a list_js.sh file, give execution flag (chmod 744 list_js.sh) and run it with a single parameter which contains all your JavaScript content: ./list_js.sh <relative_folder>
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