feat: implement native ES module support via rollup

close #298

Author: JounQin

.gitignore

@@ -1 +1,3 @@
 node_modules/
+yarn.lock
+package-lock.json

lib/ElementQueries.d.ts

@@ -0,0 +1,14 @@
+export declare class ElementQueries {
+  /**
+   * Attaches to DOMLoadContent
+   */
+  static listen(): void;
+
+  /**
+   * Parses all available CSS and attach ResizeSensor to those elements which have rules attached.
+   * Make sure this is called after 'load' event, because CSS files are not ready when domReady is fired.
+   */
+  static init(): void;
+}
+
+export default ElementQueries;