Importing vanillin from upstream ;) ;)

app/javascript/mastodon/features/account/components/header.js

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+import React from 'react';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import PropTypes from 'prop-types';
+import emojify from '../../../emoji';
+import escapeTextContentForBrowser from 'escape-html';
+import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
+import IconButton from '../../../components/icon_button';
+import Motion from 'react-motion/lib/Motion';
+import spring from 'react-motion/lib/spring';
+import { connect } from 'react-redux';
+import ImmutablePureComponent from 'react-immutable-pure-component';
+
+const messages = defineMessages({
+  unfollow: { id: 'account.unfollow', defaultMessage: 'Unfollow' },
+  follow: { id: 'account.follow', defaultMessage: 'Follow' },
+  requested: { id: 'account.requested', defaultMessage: 'Awaiting approval' },
+});
+
+const makeMapStateToProps = () => {
+  const mapStateToProps = state => ({
+    autoPlayGif: state.getIn(['meta', 'auto_play_gif']),
+  });
+
+  return mapStateToProps;
+};
+
+class Avatar extends ImmutablePureComponent {
+
+  static propTypes = {
+    account: ImmutablePropTypes.map.isRequired,
+    autoPlayGif: PropTypes.bool.isRequired,
+  };
+
+  state = {
+    isHovered: false,
+  };
+
+  handleMouseOver = () => {
+    if (this.state.isHovered) return;
+    this.setState({ isHovered: true });
+  }
+
+  handleMouseOut = () => {
+    if (!this.state.isHovered) return;
+    this.setState({ isHovered: false });
+  }
+
+  render () {
+    const { account, autoPlayGif }   = this.props;
+    const { isHovered } = this.state;
+
+    return (
+      <Motion defaultStyle={{ radius: 90 }} style={{ radius: spring(isHovered ? 30 : 90, { stiffness: 180, damping: 12 }) }}>
+        {({ radius }) =>
+          <a // eslint-disable-line jsx-a11y/anchor-has-content
+            href={account.get('url')}
+            className='account__header__avatar'
+            target='_blank'
+            rel='noopener'
+            style={{ borderRadius: `${radius}px`, backgroundImage: `url(${autoPlayGif || isHovered ? account.get('avatar') : account.get('avatar_static')})` }}
+            onMouseOver={this.handleMouseOver}
+            onMouseOut={this.handleMouseOut}
+            onFocus={this.handleMouseOver}
+            onBlur={this.handleMouseOut}
+          />
+        }
+      </Motion>
+    );
+  }
+
+}
+
+@connect(makeMapStateToProps)
+@injectIntl
+export default class Header extends ImmutablePureComponent {
+
+  static propTypes = {
+    account: ImmutablePropTypes.map,
+    me: PropTypes.number.isRequired,
+    onFollow: PropTypes.func.isRequired,
+    intl: PropTypes.object.isRequired,
+    autoPlayGif: PropTypes.bool.isRequired,
+  };
+
+  render () {
+    const { account, me, intl } = this.props;
+
+    if (!account) {
+      return null;
+    }
+
+    let displayName = account.get('display_name');
+    let info        = '';
+    let actionBtn   = '';
+    let lockedIcon  = '';
+
+    if (displayName.length === 0) {
+      displayName = account.get('username');
+    }
+
+    if (me !== account.get('id') && account.getIn(['relationship', 'followed_by'])) {
+      info = <span className='account--follows-info'><FormattedMessage id='account.follows_you' defaultMessage='Follows you' /></span>;
+    }
+
+    if (me !== account.get('id')) {
+      if (account.getIn(['relationship', 'requested'])) {
+        actionBtn = (
+          <div className='account--action-button'>
+            <IconButton size={26} disabled icon='hourglass' title={intl.formatMessage(messages.requested)} />
+          </div>
+        );
+      } else if (!account.getIn(['relationship', 'blocking'])) {
+        actionBtn = (
+          <div className='account--action-button'>
+            <IconButton size={26} icon={account.getIn(['relationship', 'following']) ? 'user-times' : 'user-plus'} active={account.getIn(['relationship', 'following'])} title={intl.formatMessage(account.getIn(['relationship', 'following']) ? messages.unfollow : messages.follow)} onClick={this.props.onFollow} />
+          </div>
+        );
+      }
+    }
+
+    if (account.get('locked')) {
+      lockedIcon = <i className='fa fa-lock' />;
+    }
+
+    const content         = { __html: emojify(account.get('note')) };
+    const displayNameHTML = { __html: emojify(escapeTextContentForBrowser(displayName)) };
+
+    return (
+      <div className='account__header' style={{ backgroundImage: `url(${account.get('header')})` }}>
+        <div>
+          <Avatar account={account} autoPlayGif={this.props.autoPlayGif} />
+
+          <span className='account__header__display-name' dangerouslySetInnerHTML={displayNameHTML} />
+          <span className='account__header__username'>@{account.get('acct')} {lockedIcon}</span>
+          <div className='account__header__content' dangerouslySetInnerHTML={content} />
+
+          {info}
+          {actionBtn}
+        </div>
+      </div>
+    );
+  }
+
+}

app/javascript/mastodon/features/notifications/components/notification.js

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+import React from 'react';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import StatusContainer from '../../../containers/status_container';
+import AccountContainer from '../../../containers/account_container';
+import { FormattedMessage } from 'react-intl';
+import Permalink from '../../../components/permalink';
+import emojify from '../../../emoji';
+import escapeTextContentForBrowser from 'escape-html';
+import ImmutablePureComponent from 'react-immutable-pure-component';
+
+export default class Notification extends ImmutablePureComponent {
+
+  static propTypes = {
+    notification: ImmutablePropTypes.map.isRequired,
+  };
+
+  renderFollow (account, link) {
+    return (
+      <div className='notification notification-follow'>
+        <div className='notification__message'>
+          <div className='notification__favourite-icon-wrapper'>
+            <i className='fa fa-fw fa-user-plus' />
+          </div>
+
+          <FormattedMessage id='notification.follow' defaultMessage='{name} followed you' values={{ name: link }} />
+        </div>
+
+        <AccountContainer id={account.get('id')} withNote={false} />
+      </div>
+    );
+  }
+
+  renderMention (notification) {
+    return <StatusContainer id={notification.get('status')} withDismiss />;
+  }
+
+  renderFavourite (notification, link) {
+    return (
+      <div className='notification notification-favourite'>
+        <div className='notification__message'>
+          <div className='notification__favourite-icon-wrapper'>
+            <i className='fa fa-fw fa-star star-icon' />
+          </div>
+          <FormattedMessage id='notification.favourite' defaultMessage='{name} favourited your status' values={{ name: link }} />
+        </div>
+
+        <StatusContainer id={notification.get('status')} account={notification.get('account')} muted withDismiss />
+      </div>
+    );
+  }
+
+  renderReblog (notification, link) {
+    return (
+      <div className='notification notification-reblog'>
+        <div className='notification__message'>
+          <div className='notification__favourite-icon-wrapper'>
+            <i className='fa fa-fw fa-retweet' />
+          </div>
+          <FormattedMessage id='notification.reblog' defaultMessage='{name} boosted your status' values={{ name: link }} />
+        </div>
+
+        <StatusContainer id={notification.get('status')} account={notification.get('account')} muted withDismiss />
+      </div>
+    );
+  }
+
+  render () {
+    const { notification } = this.props;
+    const account          = notification.get('account');
+    const displayName      = account.get('display_name').length > 0 ? account.get('display_name') : account.get('username');
+    const displayNameHTML  = { __html: emojify(escapeTextContentForBrowser(displayName)) };
+    const link             = <Permalink className='notification__display-name' href={account.get('url')} title={account.get('acct')} to={`/accounts/${account.get('id')}`} dangerouslySetInnerHTML={displayNameHTML} />;
+
+    switch(notification.get('type')) {
+    case 'follow':
+      return this.renderFollow(account, link);
+    case 'mention':
+      return this.renderMention(notification);
+    case 'favourite':
+      return this.renderFavourite(notification, link);
+    case 'reblog':
+      return this.renderReblog(notification, link);
+    }
+
+    return null;
+  }
+
+}

app/javascript/mastodon/features/notifications/containers/notification_container.js

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+import { connect } from 'react-redux';
+import { makeGetNotification } from '../../../selectors';
+import Notification from '../components/notification';
+
+const makeMapStateToProps = () => {
+  const getNotification = makeGetNotification();
+
+  const mapStateToProps = (state, props) => ({
+    notification: getNotification(state, props.notification, props.accountId),
+  });
+
+  return mapStateToProps;
+};
+
+export default connect(makeMapStateToProps)(Notification);