CoreInput form error adding

ui/src/core/extensions/extensions.ts

@@ -25,6 +25,7 @@ declare global {
     fromArray(): number[];
     toPx(): string;
     unixFromDate(): string;
+    isValid(str: string): boolean;
   }
 
   interface String {

ui/src/core/extensions/number.ts

@@ -18,4 +18,10 @@ export const NumberExtensions = () => {
       return `${date.getUTCFullYear()}.${date.getMonth()}.${date.getDay()}  ${date.getHours()}:${date.getMinutes()}`;
     };
   }
+  if (Number().isValid === undefined) {
+    // eslint-disable-next-line no-extend-native
+    Number.prototype.isValid = function (str: string) {
+      return !isNaN(Number(str));
+    };
+  }
 };