A Bash script to generate and format barrel files (index.ts) for TypeScript projects. It recursively scans directories for TypeScript files, creates export statements for default and named exports, and formats the output using Prettier if available.

generate-barrels.sh

#!/bin/bash

MAXDEPTH=${MAXDEPTH:-1}
BARREL_NAME=index.ts
CWD="$(pwd)"

set -e
IFS=$'\n'

function generate_barrels { (
	if [ ! -d "$1" ]; then
		echo -e "\033[31mError: $1 is not a directory\033[0m"
		return
	fi

	pushd "$1" >/dev/null

	### Remove Existing Barrel ###
	rm -f "$BARREL_NAME"

	### List Files ###
	FILENAMES=($(
		find . -mindepth 1 -maxdepth $MAXDEPTH ! -name '.*' ! -name 'index.*' ! -path '*/__*__*' ! -name '*.test.*' ! -name '*.mock.*' |
      sed -E 's:^(.*/)([^/]*)(\.[^.]*)$:\1\2: ; s:^\./::' |
			sort -u
	))

	echo -e "\033[36m· Generating barrel for $1 on ${#FILENAMES[@]} files...\033[0m"

	# Comma separated list of files
	echo -e '  → '$(
		IFS=', '
		echo "${FILENAMES[*]}"
	) | sed -E 's:,:, :g'

	# 파일이 없을 시 리턴
	[ -z "$FILENAMES" ] && return

	### Generate Exports ###
	echo "/* Auto-generated by scripts/generate-barrels.sh */" >>"$BARREL_NAME"
	echo >>"$BARREL_NAME"

	for file in "${FILENAMES[@]}"; do
		# Default export 존재 여부 확인
		[ -n "$(cat $file.* $file/index.* 2>/dev/null | grep -E '^export (default|{ default })')" ] &&
			echo "export { default as ${file##*/} } from './$file'" >>"$BARREL_NAME"
	done

	echo >>"$BARREL_NAME"

	for file in "${FILENAMES[@]}"; do
		# Named export 존재 여부 확인
		[ -n "$(cat $file.* $file/index.* 2>/dev/null | grep -E '^export' | grep -vE '^export (default|{ default })')" ] &&
			echo "export * from './$file'" >>"$BARREL_NAME"
	done

	popd >/dev/null
); }

for dir in $@; do
	generate_barrels "$dir"
	echo
done

if [ -x "$(command -v prettier)" ]; then
	echo -e "\033[36m· Formatting barrels...\033[0m"
	for dir in $@; do
		[ -f "$dir/$BARREL_NAME" ] && prettier --write "$dir/$BARREL_NAME" >/dev/null &
	done
fi

wait

echo
echo -e "\033[32mDone!\033[0m"