add raise function

src/index.js

@@ -9,3 +9,4 @@ export { default as scaleCanvas } from './lib/scaleCanvas.js';
 export { default as flatten } from './lib/flatten.js';
 export { default as uniques } from './lib/uniques.js';
 export { default as calcExtents } from './lib/calcExtents.js';
+export { default as raise } from './lib/raise.js';

src/lib/raise.js

@@ -0,0 +1,11 @@
+/* --------------------------------------------
+ *
+ * Move an element to the last child
+ * Adapted from d3-selection `.raise`
+ * https://github.com/d3/d3-selection#selection_raise
+ *
+ * --------------------------------------------
+ */
+export default function raise(el) {
+	if (el.nextSibling) el.parentNode.appendChild(el);
+}