Default the textdomain to 'default'

README.md

@@ -452,6 +452,11 @@ Asset::add( 'my-thing', 'js/something.js' )
 Asset::add( 'my-thing', 'js/something.js' )
 	->with_translations( $textdomain, 'relative/path/to/json/lang/files' )
 	->register();
+
+// Using the 'default' textdomain and the default path of 'languages/'.
+Asset::add( 'my-thing', 'js/something.js' )
+	->with_translations()
+	->register();
 ```
 
 ### Conditional enqueuing

src/Assets/Asset.php

@@ -1760,7 +1760,7 @@ public function use_asset_file( bool $use_asset_file = true ): self {
 	 *
 	 * @return self
 	 */
-	public function with_translations( string $textdomain, string $path = 'languages' ): self {
+	public function with_translations( string $textdomain = 'default', string $path = 'languages' ): self {
 		if ( ! $this->is_js() ) {
 			throw new InvalidArgumentException( 'Translations may only be set for JS assets.' );
 		}