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diff --git a/app/javascript/flavours/glitch/features/composer/spoiler/index.js b/app/javascript/flavours/glitch/features/composer/spoiler/index.js
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index 000000000..a49b0e10f
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+++ b/app/javascript/flavours/glitch/features/composer/spoiler/index.js
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+//  Package imports.
+import React from 'react';
+import PropTypes from 'prop-types';
+import { defineMessages, FormattedMessage } from 'react-intl';
+
+//  Components.
+import Collapsable from 'flavours/glitch/components/collapsable';
+
+//  Utils.
+import {
+  assignHandlers,
+  hiddenComponent,
+} from 'flavours/glitch/util/react_helpers';
+
+//  Messages.
+const messages = defineMessages({
+  placeholder: {
+    defaultMessage: 'Write your warning here',
+    id: 'compose_form.spoiler_placeholder',
+  },
+});
+
+//  Handlers.
+const handlers = {
+
+  //  Handles a keypress.
+  handleKeyDown ({
+    ctrlKey,
+    keyCode,
+    metaKey,
+  }) {
+    const { onSubmit } = this.props;
+
+    //  We submit the status on control/meta + enter.
+    if (onSubmit && keyCode === 13 && (ctrlKey || metaKey)) {
+      onSubmit();
+    }
+  },
+};
+
+//  The component.
+export default class ComposerSpoiler extends React.PureComponent {
+
+  //  Constructor.
+  constructor (props) {
+    super(props);
+    assignHandlers(this, handlers);
+  }
+
+  //  Rendering.
+  render () {
+    const { handleKeyDown } = this.handlers;
+    const {
+      hidden,
+      intl,
+      onChange,
+      text,
+    } = this.props;
+
+    //  The result.
+    return (
+      <Collapsable
+        isVisible={!hidden}
+        fullHeight={50}
+      >
+        <label className='composer--spoiler'>
+          <span {...hiddenComponent}>
+            <FormattedMessage {...messages.placeholder} />
+          </span>
+          <input
+            id='glitch.composer.spoiler.input'
+            onChange={onChange}
+            onKeyDown={handleKeyDown}
+            placeholder={intl.formatMessage(messages.placeholder)}
+            type='text'
+            value={text}
+          />
+        </label>
+      </Collapsable>
+    );
+  }
+
+}
+
+//  Props.
+ComposerSpoiler.propTypes = {
+  hidden: PropTypes.bool,
+  intl: PropTypes.object.isRequired,
+  onChange: PropTypes.func,
+  onSubmit: PropTypes.func,
+  text: PropTypes.string,
+};