implement pinch to zoom

node_modules/component-closest/index.js

@@ -0,0 +1,36 @@
+/**
+ * Module Dependencies
+ */
+
+try {
+  var matches = require('matches-selector')
+} catch (err) {
+  var matches = require('component-matches-selector')
+}
+
+/**
+ * Export `closest`
+ */
+
+module.exports = closest
+
+/**
+ * Closest
+ *
+ * @param {Element} el
+ * @param {String} selector
+ * @param {Element} scope (optional)
+ */
+
+function closest (el, selector, scope) {
+  scope = scope || document.documentElement;
+
+  // walk up the dom
+  while (el && el !== scope) {
+    if (matches(el, selector)) return el;
+    el = el.parentNode;
+  }
+
+  // check scope for match
+  return matches(el, selector) ? el : null;
+}