How to use the fontmake.font_project.INTERPOLATABLE_OUTPUTS function in fontmake

"%(choices)s. Default: INFO",
    )
    args = vars(parser.parse_args(args))

    specs = args.pop("feature_writer_specs")
    if specs is not None:
        args["feature_writers"] = _loadFeatureWriters(parser, specs)

    glyphs_path = args.pop("glyphs_path")
    ufo_paths = args.pop("ufo_paths")
    designspace_path = args.pop("mm_designspace")
    input_format = (
        "Glyphs" if glyphs_path else "designspace" if designspace_path else "UFO"
    ) + " source"

    if INTERPOLATABLE_OUTPUTS.intersection(args["output"]):
        if not (glyphs_path or designspace_path):
            parser.error("Glyphs or designspace source required for variable font")
        exclude_args(
            parser,
            args,
            [
                "interpolate",
                "masters_as_instances",
                "interpolate_binary_layout",
                "use_mutatormath",
            ],
            "variable output",
        )
    else:
        exclude_args(parser, args, ["optimize_gvar"], "static output", positive=False)