Replace sprockets/browserify with Webpack (#2617)

* Replace browserify with webpack

* Add react-intl-translations-manager

* Do not minify in development, add offline-plugin for ServiceWorker background cache updates

* Adjust tests and dependencies

* Fix production deployments

* Fix tests

* More optimizations

* Improve travis cache for npm stuff

* Re-run travis

* Add back support for custom.scss as before

* Remove offline-plugin and babili

* Fix issue with Immutable.List().unshift(...values) not working as expected

* Make travis load schema instead of running all migrations in sequence

* Fix missing React import in WarningContainer. Optimize rendering performance by using ImmutablePureComponent instead of
React.PureComponent. ImmutablePureComponent uses Immutable.is() to compare props. Replace dynamic callback bindings in
<UI />

* Add react definitions to places that use JSX

* Add Procfile.dev for running rails, webpack and streaming API at the same time

app/javascript/mastodon/middleware/errors.js

@@ -0,0 +1,33 @@
+import { showAlert } from '../actions/alerts';
+
+const defaultSuccessSuffix = 'SUCCESS';
+const defaultFailSuffix = 'FAIL';
+
+export default function errorsMiddleware() {
+  return ({ dispatch }) => next => action => {
+    if (action.type && !action.skipAlert) {
+      const isFail = new RegExp(`${defaultFailSuffix}$`, 'g');
+      const isSuccess = new RegExp(`${defaultSuccessSuffix}$`, 'g');
+
+      if (action.type.match(isFail)) {
+        if (action.error.response) {
+          const { data, status, statusText } = action.error.response;
+
+          let message = statusText;
+          let title   = `${status}`;
+
+          if (data.error) {
+            message = data.error;
+          }
+
+          dispatch(showAlert(title, message));
+        } else {
+          console.error(action.error); // eslint-disable-line no-console
+          dispatch(showAlert('Oops!', 'An unexpected error occurred.'));
+        }
+      }
+    }
+
+    return next(action);
+  };
+};

app/javascript/mastodon/middleware/loading_bar.js

@@ -0,0 +1,25 @@
+import { showLoading, hideLoading } from 'react-redux-loading-bar';
+
+const defaultTypeSuffixes = ['PENDING', 'FULFILLED', 'REJECTED'];
+
+export default function loadingBarMiddleware(config = {}) {
+  const promiseTypeSuffixes = config.promiseTypeSuffixes || defaultTypeSuffixes;
+
+  return ({ dispatch }) => next => (action) => {
+    if (action.type && !action.skipLoading) {
+      const [PENDING, FULFILLED, REJECTED] = promiseTypeSuffixes;
+
+      const isPending = new RegExp(`${PENDING}$`, 'g');
+      const isFulfilled = new RegExp(`${FULFILLED}$`, 'g');
+      const isRejected = new RegExp(`${REJECTED}$`, 'g');
+
+      if (action.type.match(isPending)) {
+        dispatch(showLoading());
+      } else if (action.type.match(isFulfilled) || action.type.match(isRejected)) {
+        dispatch(hideLoading());
+      }
+    }
+
+    return next(action);
+  };
+};

app/javascript/mastodon/middleware/sounds.js

@@ -0,0 +1,22 @@
+const play = audio => {
+  if (!audio.paused) {
+    audio.pause();
+    audio.fastSeek(0);
+  }
+
+  audio.play();
+};
+
+export default function soundsMiddleware() {
+  const soundCache = {
+    boop: new Audio(['/sounds/boop.mp3'])
+  };
+
+  return ({ dispatch }) => next => (action) => {
+    if (action.meta && action.meta.sound && soundCache[action.meta.sound]) {
+      play(soundCache[action.meta.sound]);
+    }
+
+    return next(action);
+  };
+};