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node_modules/vant/es/utils/dom/event.js

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+import { isServer } from '..';
+// eslint-disable-next-line import/no-mutable-exports
+export var supportsPassive = false;
+
+if (!isServer) {
+  try {
+    var opts = {};
+    Object.defineProperty(opts, 'passive', {
+      // eslint-disable-next-line getter-return
+      get: function get() {
+        /* istanbul ignore next */
+        supportsPassive = true;
+      }
+    });
+    window.addEventListener('test-passive', null, opts); // eslint-disable-next-line no-empty
+  } catch (e) {}
+}
+
+export function on(target, event, handler, passive) {
+  if (passive === void 0) {
+    passive = false;
+  }
+
+  if (!isServer) {
+    target.addEventListener(event, handler, supportsPassive ? {
+      capture: false,
+      passive: passive
+    } : false);
+  }
+}
+export function off(target, event, handler) {
+  if (!isServer) {
+    target.removeEventListener(event, handler);
+  }
+}
+export function stopPropagation(event) {
+  event.stopPropagation();
+}
+export function preventDefault(event, isStopPropagation) {
+  /* istanbul ignore else */
+  if (typeof event.cancelable !== 'boolean' || event.cancelable) {
+    event.preventDefault();
+  }
+
+  if (isStopPropagation) {
+    stopPropagation(event);
+  }
+}