gistfile1.txt

#!/bin/sh

remote="$1"
url="$2"

z40=0000000000000000000000000000000000000000

while read local_ref local_sha remote_ref remote_sha
do
	if [ "$local_sha" = $z40 ]
	then
		# Handle delete
		:
	else
		if [ "$remote_sha" = $z40 ]
		then
			# New branch, examine all commits
			range="$(git symbolic-ref refs/remotes/$remote/HEAD)..$local_sha"
		else
			# Update to existing branch, examine new commits
			range="$remote_sha..$local_sha"
		fi

    files=$(git diff --diff-filter=ACMR --name-only "$range")

    if [ -z $files ]; then
      echo "No files to check."
      exit
    fi;

    echo "Checking prettier for $files"
    npx prettier --check $files
	fi
done

exit 0

Put it in ./git/hooks/pre-push and then chmod +x it.