Add a confirmation modal: (#2279)

- Deleting a toot
- Muting, blocking someone
- Clearing notifications

Remove source map generation from development environment, as it is a huge
performance sink hole with little gains

app/assets/javascripts/components/features/ui/components/confirmation_modal.jsx

@@ -0,0 +1,50 @@
+import PropTypes from 'prop-types';
+import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
+import Button from '../../../components/button';
+
+class ConfirmationModal extends React.PureComponent {
+
+  constructor (props, context) {
+    super(props, context);
+    this.handleClick = this.handleClick.bind(this);
+    this.handleCancel = this.handleCancel.bind(this);
+  }
+
+  handleClick () {
+    this.props.onClose();
+    this.props.onConfirm();
+  }
+
+  handleCancel (e) {
+    e.preventDefault();
+    this.props.onClose();
+  }
+
+  render () {
+    const { intl, message, confirm, onConfirm, onClose } = this.props;
+
+    return (
+      <div className='modal-root__modal confirmation-modal'>
+        <div className='confirmation-modal__container'>
+          {message}
+        </div>
+
+        <div className='confirmation-modal__action-bar'>
+          <div><a href='#' onClick={this.handleCancel}><FormattedMessage id='confirmation_modal.cancel' defaultMessage='Cancel' /></a></div>
+          <Button text={confirm} onClick={this.handleClick} />
+        </div>
+      </div>
+    );
+  }
+
+}
+
+ConfirmationModal.propTypes = {
+  message: PropTypes.node.isRequired,
+  confirm: PropTypes.string.isRequired,
+  onClose: PropTypes.func.isRequired,
+  onConfirm: PropTypes.func.isRequired,
+  intl: PropTypes.object.isRequired
+};
+
+export default injectIntl(ConfirmationModal);

app/assets/javascripts/components/features/ui/components/modal_root.jsx

@@ -3,13 +3,15 @@ import MediaModal from './media_modal';
 import OnboardingModal from './onboarding_modal';
 import VideoModal from './video_modal';
 import BoostModal from './boost_modal';
+import ConfirmationModal from './confirmation_modal';
 import { TransitionMotion, spring } from 'react-motion';
 
 const MODAL_COMPONENTS = {
   'MEDIA': MediaModal,
   'ONBOARDING': OnboardingModal,
   'VIDEO': VideoModal,
-  'BOOST': BoostModal
+  'BOOST': BoostModal,
+  'CONFIRM': ConfirmationModal
 };
 
 class ModalRoot extends React.PureComponent {