OV-29: + utilities methods to validate array and obj

frontend/src/bundles/common/helpers/helpers.ts

@@ -1 +1,2 @@
+export { isEmptyArray,isNullOrUndefined, isStringNullOrEmpty } from './utilities.js';
 export { configureString } from 'shared';

frontend/src/bundles/common/helpers/utilities.ts

@@ -0,0 +1,9 @@
+const isNullOrUndefined = <T>(value: T | null | undefined): value is null | undefined =>
+    value === undefined || value === null;
+
+const isStringNullOrEmpty = (value: string | null | undefined): value is null | undefined =>
+    isNullOrUndefined<string>(value) || (value ).trim().length === 0;
+
+const isEmptyArray = <T>(value: T[]): boolean => isNullOrUndefined<T[]>(value) || value.length === 0;
+
+export { isEmptyArray, isNullOrUndefined, isStringNullOrEmpty };