Added high level ErrorBoundary

app/components/Editor/components/Heading.js

@@ -15,6 +15,7 @@ type Props = {
   readOnly: boolean,
   component?: string,
   attributes: Object,
+  className?: string,
 };
 
 function Heading(props: Props) {
@@ -26,6 +27,7 @@ function Heading(props: Props) {
     readOnly,
     children,
     component = 'h1',
+    className,
     attributes,
   } = props;
   const parentIsDocument = parent instanceof Document;
@@ -40,7 +42,7 @@ function Heading(props: Props) {
     emoji && title.match(new RegExp(`^${emoji}\\s`));
 
   return (
-    <Component {...attributes} id={slugish}>
+    <Component {...attributes} id={slugish} className={className}>
       <Wrapper hasEmoji={startsWithEmojiAndSpace}>{children}</Wrapper>
       {showPlaceholder && (
         <Placeholder contentEditable={false}>

app/components/ErrorBoundary/ErrorBoundary.js

@@ -0,0 +1,42 @@
+// @flow
+import React, { Component } from 'react';
+import { observer } from 'mobx-react';
+import { observable } from 'mobx';
+import CenteredContent from 'components/CenteredContent';
+import PageTitle from 'components/PageTitle';
+
+@observer
+class ErrorBoundary extends Component {
+  @observable error: boolean = false;
+
+  componentDidCatch(error: Error, info: Object) {
+    this.error = true;
+
+    // Error handler is often blocked by the browser
+    if (window.Bugsnag) {
+      Bugsnag.notifyException(error, { react: info });
+    }
+  }
+
+  handleReload = () => {
+    window.location.reload();
+  };
+
+  render() {
+    if (this.error) {
+      return (
+        <CenteredContent>
+          <PageTitle title="Unknown Error" />
+          <h1>Something went wrong</h1>
+          <p>
+            An unrecoverable error occurred. Please try{' '}
+            <a onClick={this.handleReload}>reloading</a>.
+          </p>
+        </CenteredContent>
+      );
+    }
+    return this.props.children;
+  }
+}
+
+export default ErrorBoundary;

app/components/ErrorBoundary/index.js

@@ -0,0 +1,3 @@
+// @flow
+import ErrorBoundary from './ErrorBoundary';
+export default ErrorBoundary;

app/index.js

@@ -28,6 +28,7 @@ import Flatpage from 'scenes/Flatpage';
 import ErrorAuth from 'scenes/ErrorAuth';
 import Error404 from 'scenes/Error404';
 
+import ErrorBoundary from 'components/ErrorBoundary';
 import ScrollToTop from 'components/ScrollToTop';
 import Layout from 'components/Layout';
 import RouteSidebarHidden from 'components/RouteSidebarHidden';
@@ -101,62 +102,68 @@ globalStyles();
 
 render(
   <div style={{ display: 'flex', flex: 1, height: '100%' }}>
-    <Provider {...stores}>
-      <Router>
-        <ScrollToTop>
-          <Switch>
-            <Route exact path="/" component={Home} />
+    <ErrorBoundary>
+      <Provider {...stores}>
+        <Router>
+          <ScrollToTop>
+            <Switch>
+              <Route exact path="/" component={Home} />
 
-            <Route exact path="/auth/slack" component={SlackAuth} />
-            <Route exact path="/auth/slack/commands" component={SlackAuth} />
-            <Route exact path="/auth/error" component={ErrorAuth} />
+              <Route exact path="/auth/slack" component={SlackAuth} />
+              <Route exact path="/auth/slack/commands" component={SlackAuth} />
+              <Route exact path="/auth/error" component={ErrorAuth} />
 
-            <Auth>
-              <Layout>
-                <Switch>
-                  <Route exact path="/dashboard" component={Dashboard} />
-                  <Route exact path="/starred" component={Starred} />
-                  <Route exact path="/collections/:id" component={Collection} />
-                  <Route
-                    exact
-                    path={`/d/${matchDocumentSlug}`}
-                    component={RedirectDocument}
-                  />
-                  <Route
-                    exact
-                    path={`/doc/${matchDocumentSlug}`}
-                    component={Document}
-                  />
-                  <Route
-                    exact
-                    path={`/doc/${matchDocumentSlug}/move`}
-                    component={Document}
-                  />
+              <Auth>
+                <Layout>
+                  <Switch>
+                    <Route exact path="/dashboard" component={Dashboard} />
+                    <Route exact path="/starred" component={Starred} />
+                    <Route
+                      exact
+                      path="/collections/:id"
+                      component={Collection}
+                    />
+                    <Route
+                      exact
+                      path={`/d/${matchDocumentSlug}`}
+                      component={RedirectDocument}
+                    />
+                    <Route
+                      exact
+                      path={`/doc/${matchDocumentSlug}`}
+                      component={Document}
+                    />
+                    <Route
+                      exact
+                      path={`/doc/${matchDocumentSlug}/move`}
+                      component={Document}
+                    />
 
-                  <Route exact path="/search" component={Search} />
-                  <Route exact path="/search/:query" component={Search} />
-                  <Route exact path="/developers" component={Api} />
+                    <Route exact path="/search" component={Search} />
+                    <Route exact path="/search/:query" component={Search} />
+                    <Route exact path="/developers" component={Api} />
 
-                  <Route path="/404" component={Error404} />
+                    <Route path="/404" component={Error404} />
 
-                  <RouteSidebarHidden
-                    exact
-                    path={`/doc/${matchDocumentSlug}/edit`}
-                    component={Document}
-                  />
-                  <RouteSidebarHidden
-                    exact
-                    path="/collections/:id/new"
-                    component={DocumentNew}
-                  />
-                  <Route component={notFoundSearch} />
-                </Switch>
-              </Layout>
-            </Auth>
-          </Switch>
-        </ScrollToTop>
-      </Router>
-    </Provider>
+                    <RouteSidebarHidden
+                      exact
+                      path={`/doc/${matchDocumentSlug}/edit`}
+                      component={Document}
+                    />
+                    <RouteSidebarHidden
+                      exact
+                      path="/collections/:id/new"
+                      component={DocumentNew}
+                    />
+                    <Route component={notFoundSearch} />
+                  </Switch>
+                </Layout>
+              </Auth>
+            </Switch>
+          </ScrollToTop>
+        </Router>
+      </Provider>
+    </ErrorBoundary>
     {DevTools && <DevTools position={{ bottom: 0, right: 0 }} />}
   </div>,
   document.getElementById('root')