lower util

Author: davidjbradshaw

packages/child/index.js

@@ -70,6 +70,7 @@ import {
   isDef,
   // isElement,
   isolateUserCode,
+  lower,
   once,
   round,
   typeAssert,
@@ -259,7 +260,7 @@ function iframeResizerChild() {
   const resetNoResponseTimer = () => sendMessage(0, 0, BEFORE_UNLOAD)
 
   function setupOnPageHide() {
-    addEventListener(window, PAGE_HIDE.toLowerCase(), ({ persisted }) => {
+    addEventListener(window, lower(PAGE_HIDE), ({ persisted }) => {
       if (!persisted) resetNoResponseTimer()
       consoleEvent(PAGE_HIDE)
       info('Page persisted:', persisted)

packages/common/utils.js

@@ -34,6 +34,8 @@ export const isDef = (value) => `${value}` !== '' && value !== undefined
 
 export const invoke = (fn) => fn()
 
+export const lower = (str) => str.toLowerCase()
+
 export function getElementName(el) {
   switch (true) {
     case !isDef(el):