Require any modules after loading polyfill in entry points (#4231)

app/javascript/mastodon/main.js delayed the execution of modules,
but other entry points didn't. That leads to failure in executing
modules, which requires those polyfills.

Strictly enforce the rule to require any modules after loading
polyfill in entry points.

app/javascript/mastodon/main.js

@@ -1,12 +1,14 @@
+import * as OfflinePluginRuntime from 'offline-plugin/runtime';
+import * as WebPushSubscription from './web_push_subscription';
+import Mastodon from 'mastodon/containers/mastodon';
+import React from 'react';
+import ReactDOM from 'react-dom';
 import ready from './ready';
 
 const perf = require('./performance');
 
 function main() {
   perf.start('main()');
-  const Mastodon = require('mastodon/containers/mastodon').default;
-  const React = require('react');
-  const ReactDOM = require('react-dom');
 
   if (window.history && history.replaceState) {
     const { pathname, search, hash } = window.location;
@@ -23,9 +25,6 @@ function main() {
     ReactDOM.render(<Mastodon {...props} />, mountNode);
     if (process.env.NODE_ENV === 'production') {
       // avoid offline in dev mode because it's harder to debug
-      const OfflinePluginRuntime = require('offline-plugin/runtime');
-      const WebPushSubscription = require('./web_push_subscription');
-
       OfflinePluginRuntime.install();
       WebPushSubscription.register();
     }

app/javascript/packs/about.js

@@ -1,12 +1,11 @@
-import TimelineContainer from '../mastodon/containers/timeline_container';
-import React from 'react';
-import ReactDOM from 'react-dom';
 import loadPolyfills from '../mastodon/load_polyfills';
-import ready from '../mastodon/ready';
 
 require.context('../images/', true);
 
 function loaded() {
+  const TimelineContainer = require('../mastodon/containers/timeline_container').default;
+  const React = require('react');
+  const ReactDOM = require('react-dom');
   const mountNode = document.getElementById('mastodon-timeline');
 
   if (mountNode !== null) {
@@ -16,6 +15,7 @@ function loaded() {
 }
 
 function main() {
+  const ready = require('../mastodon/ready').default;
   ready(loaded);
 }
 

app/javascript/packs/application.js

@@ -1,6 +1,7 @@
-import main from '../mastodon/main';
 import loadPolyfills from '../mastodon/load_polyfills';
 
-loadPolyfills().then(main).catch(e => {
+loadPolyfills().then(() => {
+  require('../mastodon/main').default();
+}).catch(e => {
   console.error(e);
 });

app/javascript/packs/public.js

@@ -1,15 +1,17 @@
-import { length } from 'stringz';
-import IntlRelativeFormat from 'intl-relativeformat';
-import { delegate } from 'rails-ujs';
-import emojify from '../mastodon/emoji';
-import { getLocale } from '../mastodon/locales';
 import loadPolyfills from '../mastodon/load_polyfills';
-import ready from '../mastodon/ready';
 
-const { localeData } = getLocale();
-localeData.forEach(IntlRelativeFormat.__addLocaleData);
+function main() {
+  const { length } = require('stringz');
+  const IntlRelativeFormat = require('intl-relativeformat').default;
+  const { delegate } = require('rails-ujs');
+  const emojify = require('../mastodon/emoji').default;
+  const { getLocale } = require('../mastodon/locales');
+  const ready = require('../mastodon/ready').default;
+
+  const { localeData } = getLocale();
+  localeData.forEach(IntlRelativeFormat.__addLocaleData);
 
-function loaded() {
+  ready(() => {
     const locale = document.documentElement.lang;
     const dateTimeFormat = new Intl.DateTimeFormat(locale, {
       year: 'numeric',
@@ -35,10 +37,7 @@ function loaded() {
       const datetime = new Date(content.getAttribute('datetime'));
       content.textContent = relativeFormat.format(datetime);;
     });
-}
-
-function main() {
-  ready(loaded);
+  });
 
   delegate(document, '.video-player video', 'click', ({ target }) => {
     if (target.paused) {