Simple script to rename React .js files that render jsx to .jsx

rename-js-jsx.py

import os
import re

root_dir = "src"

JSX_REGEX = r"<\w+"

for dirpath, dirnames, filenames in os.walk(root_dir):
    for filename in filenames:
        if filename.endswith(".js"):
            filepath = os.path.join(dirpath, filename)
            with open(filepath, "r") as f:
                file_contents = f.read()
                if re.search(JSX_REGEX, file_contents):
                    new_filename = filename.replace(".js", ".jsx")
                    new_filepath = os.path.join(dirpath, new_filename)
                    os.rename(filepath, new_filepath)
                    print(f'{filename} has been renamed to {new_filename}')