--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/default/node_modules/shoestring/src/dom/is.js	Sat May 31 09:21:51 2025 +0800
@@ -0,0 +1,72 @@
+//>>excludeStart("exclude", pragmas.exclude);
+define([ "shoestring" ], function(){
+//>>excludeEnd("exclude");
+
+  /**
+	 * Checks the current set of elements against the selector, if one matches return `true`.
+	 *
+	 * @param {string} selector The selector to check.
+	 * @return {boolean}
+	 * @this {shoestring}
+	 */
+	shoestring.fn.is = function( selector ){
+		var ret = false, self = this, parents, check;
+
+		// assume a dom element
+		if( typeof selector !== "string" ){
+			// array-like, ie shoestring objects or element arrays
+			if( selector.length && selector[0] ){
+				check = selector;
+			} else {
+				check = [selector];
+			}
+
+			return _checkElements(this, check);
+		}
+
+		parents = this.parent();
+
+		if( !parents.length ){
+			parents = shoestring( doc );
+		}
+
+		parents.each(function( i, e ) {
+			var children;
+
+//>>includeStart("development", pragmas.development);
+				try {
+//>>includeEnd("development");
+					children = e.querySelectorAll( selector );
+//>>includeStart("development", pragmas.development);
+				} catch( e ) {
+					shoestring.error( 'queryselector', selector );
+				}
+//>>includeEnd("development");
+
+			ret = _checkElements( self, children );
+		});
+
+		return ret;
+	};
+
+	function _checkElements(needles, haystack){
+		var ret = false;
+
+		needles.each(function() {
+			var j = 0;
+
+			while( j < haystack.length ){
+				if( this === haystack[j] ){
+					ret = true;
+				}
+
+				j++;
+			}
+		});
+
+		return ret;
+	}
+
+//>>excludeStart("exclude", pragmas.exclude);
+});
+//>>excludeEnd("exclude");