feat: enhance IsNotBlank validation to include numbers and handle null/undefined

Author: gabriel-logan

src/decorator/common/IsNotBlank.ts

@@ -3,10 +3,29 @@ import { buildMessage, ValidateBy } from './ValidateBy';
 
 export const IS_NOT_BLANK = 'isNotBlank';
 
+/**
+ * @param value The value to be checked
+ * @returns true if the value is not blank, false otherwise
+ */
 export function isNotBlank(value: unknown): boolean {
-  return !!value && typeof value === 'string' && value.trim().length > 0;
+  if (value == null) return false; // Verify if the value is null or undefined
+
+  if (typeof value === 'string') return value.trim().length > 0;
+
+  if (typeof value === 'number') return !isNaN(value);
+
+  return false; // Any other type is considered invalid
 }
 
+/**
+ * @param validationOptions The validation options
+ * @returns {PropertyDecorator}
+ *
+ * @description
+ * The decorator checks if the value is not blank
+ * @description
+ * The value is considered blank if it is null, undefined, empty string or NaN
+ */
 export function IsNotBlank(validationOptions?: ValidationOptions): PropertyDecorator {
   return ValidateBy(
     {

test/functional/validation-functions-and-decorators.spec.ts

@@ -424,7 +424,7 @@ describe('IsEmpty', () => {
 });
 
 describe('IsNotEmpty', () => {
-  const validValues = ['a', 'abc', '  '];
+  const validValues = ['a', 'abc', '  ', 0, 1];
   const invalidValues = ['', undefined, null];
 
   class MyClass {
@@ -456,8 +456,8 @@ describe('IsNotEmpty', () => {
 });
 
 describe('IsNotBlank', () => {
-  const validValues = ['a', 'abc'];
-  const invalidValues = ['', undefined, null, '  '];
+  const validValues = ['a', 'abc', 0, 1];
+  const invalidValues = ['', undefined, null, '  ', new Object()];
 
   class MyClass {
     @IsNotBlank()