Adds a .js extension to all your imports!

hacky-code-mod.py

#!/usr/bin/env python3

import re
import sys
import os

import_re = re.compile(r'^(import .*|}) from "(\.\.?/[^"]+)";?$', re.MULTILINE)

target_file = sys.argv[1]

def replace_import(match):
	with_file = lambda path: f'{match.group(1)} from "{path}";'
	to_import = match.group(2)
	if os.path.isfile(to_import):
		return match.group(0)
	elif os.path.isdir(to_import):
		return with_file(os.path.join(to_import, "index.js"))
	elif os.path.isfile(to_import + ".js"):
		return with_file(to_import + ".js")

	raise RuntimeError(f"Can't deal with import path {to_import}")

with open(target_file) as f:
	os.chdir(os.path.dirname(target_file))
	sys.stdout.write(import_re.sub(replace_import, f.read()))