feat: allow specifying options for @IsBase64 decorator

README.md

@@ -837,7 +837,7 @@ isBoolean(value);
 | `@IsAscii()`                                    | Checks if the string contains ASCII chars only. |
 | `@IsBase32()`                                   | Checks if a string is base32 encoded. |
 | `@IsBase58()`                                   | Checks if a string is base58 encoded. |
-| `@IsBase64()`                                   | Checks if a string is base64 encoded. |
+| `@IsBase64(options?: IsBase64Options)`          | Checks if a string is base64 encoded. |
 | `@IsIBAN()`                                     | Checks if a string is a IBAN (International Bank Account Number). |
 | `@IsBIC()`                                      | Checks if a string is a BIC (Bank Identification Code) or SWIFT code. |
 | `@IsByteLength(min: number, max?: number)`      | Checks if the string's length (in bytes) falls in a range. |

src/decorator/string/IsBase64.ts

@@ -1,25 +1,30 @@
 import { ValidationOptions } from '../ValidationOptions';
 import { buildMessage, ValidateBy } from '../common/ValidateBy';
 import isBase64Validator from 'validator/lib/isBase64';
+import type ValidatorJS from 'validator';
 
 export const IS_BASE64 = 'isBase64';
 
 /**
  * Checks if a string is base64 encoded.
  * If given value is not a string, then it returns false.
  */
-export function isBase64(value: unknown): boolean {
-  return typeof value === 'string' && isBase64Validator(value);
+export function isBase64(value: unknown, options?: ValidatorJS.IsBase64Options): boolean {
+  return typeof value === 'string' && isBase64Validator(value, options);
 }
 
 /**
  * Checks if a string is base64 encoded.
  * If given value is not a string, then it returns false.
  */
-export function IsBase64(validationOptions?: ValidationOptions): PropertyDecorator {
+export function IsBase64(
+  options?: ValidatorJS.IsBase64Options,
+  validationOptions?: ValidationOptions
+): PropertyDecorator {
   return ValidateBy(
     {
       name: IS_BASE64,
+      constraints: [options],
       validator: {
         validate: (value, args): boolean => isBase64(value),
         defaultMessage: buildMessage(eachPrefix => eachPrefix + '$property must be base64 encoded', validationOptions),