def METHOD_NAME() -> None:
    """Write GIT config in ~/.gitconfig."""
    git_config_path = home / ".gitconfig"
    config = configparser.RawConfigParser()
    config.read(git_config_path)
    key = 'diff "gdsdiff"'
    if key not in config.sections():
        config.add_section(key)
        config.set(key, "command", "python -m gdsfactory.difftest_git")
        config.set(key, "binary", "True")
        with open(git_config_path, "w+") as f:
            config.write(f, space_around_delimiters=True)