How to use the @aurelia/router.RouterRegistration function in @aurelia/router

// mergeDistinct,
    // isNumberOrBigInt,
    // isStringOrDate,
    exports.bound = kernel_1.bound;
    var router_1 = require("@aurelia/router");
    // Nav,
    exports.NavRoute = router_1.NavRoute;
    exports.IRouter = router_1.IRouter;
    exports.Router = router_1.Router;
    // IViewportOptions,
    // Viewport,
    // ContentStatus,
    // ViewportContent,
    exports.ViewportInstruction = router_1.ViewportInstruction;
    exports.RouterConfiguration = router_1.RouterConfiguration;
    exports.RouterRegistration = router_1.RouterRegistration;
    var runtime_1 = require("@aurelia/runtime");
    // CallFunctionExpression,
    // connects,
    // observes,
    // callsFunction,
    // hasAncestor,
    // isAssignable,
    // isLeftHandSide,
    // isPrimary,
    // isResource,
    // hasBind,
    // hasUnbind,
    // isLiteral,
    // arePureLiterals,
    // isPureLiteral,
    // CustomExpression,