planning

node_modules/consolidated-events/src/normalizeEventOptions.js

@@ -0,0 +1,17 @@
+import canUsePassiveEventListeners from './canUsePassiveEventListeners';
+
+export default function normalizeEventOptions(eventOptions) {
+  if (!eventOptions) {
+    return undefined;
+  }
+
+  if (!canUsePassiveEventListeners()) {
+    // If the browser does not support the passive option, then it is expecting
+    // a boolean for the options argument to specify whether it should use
+    // capture or not. In more modern browsers, this is passed via the `capture`
+    // option, so let's just hoist that value up.
+    return !!eventOptions.capture;
+  }
+
+  return eventOptions;
+}