def init_argparser_export_target(
            self, argparser,
            default=None,
            help='the export target',
            ):
        """
        Subclass could override this by providing alternative keyword
        arguments and call this as its super.  It should not reimplement
        this completely.  Example:

        def init_argparser_export_target(self, argparser):
            super(MyToolchainRuntime, self).init_argparser_export_target(
                argparser, default='my_default.js',
                help="the export target, default is 'my_default.js'",
            )

        Note that the above example will prevent its subclasses from
        directly using the definition of that class, but they _can_
        simply call the exact same super, or invoke ToolchainRuntime's
        init_argparser_* method directly.

        Arguments

        default
            The default export target.
        help
            The help text.
        """

        argparser.add_argument(
            '-w', '--overwrite', dest=EXPORT_TARGET_OVERWRITE,
            action='store_true',
            help='overwrite the export target without any confirmation',
        )

        argparser.add_argument(
            '--export-target', dest=EXPORT_TARGET,
            metavar=metavar(EXPORT_TARGET),
            default=default,
            help=help,
        )
Subclass could override this by providing alternative keyword
        arguments and call this as its super.  It should not reimplement
        this completely.  Example:

        def init_argparser_export_target(self, argparser):
            super(MyToolchainRuntime, self).init_argparser_export_target(
                argparser, default='my_default.js',
                help="the export target, default is 'my_default.js'",
            )

        Note that the above example will prevent its subclasses from
        directly using the definition of that class, but they _can_
        simply call the exact same super, or invoke ToolchainRuntime's
        init_argparser_* method directly.

        Arguments

        default
            The default export target.
        help
            The help text.