fix: missing import

application/source/data/datasource/server/restapi.mjs

@@ -6,7 +6,7 @@
  */
 
 import { internalSymbol, instanceSymbol } from "../../../constants.mjs";
-import { isObject } from "../../../types/is.mjs";
+import { isObject,isFunction } from "../../../types/is.mjs";
 import { Server } from "../server.mjs";
 import { WriteError } from "./restapi/writeerror.mjs";