pre-commit hook to only run a check on staged files

pre-commit

#!/bin/sh

PREFIX="pre-commit:"

fileList=$(git diff --diff-filter=d --cached --name-only)

includeFileList=$(echo "$fileList" | grep -E '\.(ts)$')
if [ ${#includeFileList} -gt 0 ]; then
    if ! deno fmt --check ${includeFileList[*]} "$@"; then
        echo "$PREFIX Commit aborted."
        echo "$PREFIX You can lint and format manually with 'deno lint'.\n"
        exit 1
    fi
fi

adapted from:

https://markus.oberlehner.net/blog/lint-only-files-with-changes-on-pre-commit/