ComposeForm: convert some buttons into TSX

app/soapbox/features/compose/components/markdown_button.tsx

@@ -0,0 +1,30 @@
+import React from 'react';
+import { defineMessages, useIntl } from 'react-intl';
+
+import ComposeFormButton from './compose_form_button';
+
+const messages = defineMessages({
+  marked: { id: 'compose_form.markdown.marked', defaultMessage: 'Post markdown enabled' },
+  unmarked: { id: 'compose_form.markdown.unmarked', defaultMessage: 'Post markdown disabled' },
+});
+
+interface IMarkdownButton {
+  active?: boolean,
+  onClick: () => void,
+}
+
+const MarkdownButton: React.FC<IMarkdownButton> = ({ active, onClick }) => {
+  const intl = useIntl();
+
+  return (
+    <ComposeFormButton
+      icon={require('@tabler/icons/icons/markdown.svg')}
+      title={intl.formatMessage(active ? messages.marked : messages.unmarked)}
+      active={active}
+      onClick={onClick}
+    />
+  );
+
+};
+
+export default MarkdownButton;

app/soapbox/features/compose/components/poll_button.tsx

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+import React from 'react';
+import { defineMessages, useIntl } from 'react-intl';
+
+import ComposeFormButton from './compose_form_button';
+
+const messages = defineMessages({
+  add_poll: { id: 'poll_button.add_poll', defaultMessage: 'Add a poll' },
+  remove_poll: { id: 'poll_button.remove_poll', defaultMessage: 'Remove poll' },
+});
+
+interface IPollButton {
+  disabled?: boolean,
+  unavailable?: boolean,
+  active?: boolean,
+  onClick: () => void,
+}
+
+const PollButton: React.FC<IPollButton> = ({ active, unavailable, disabled, onClick }) => {
+  const intl = useIntl();
+
+  if (unavailable) {
+    return null;
+  }
+
+  return (
+    <ComposeFormButton
+      icon={require('@tabler/icons/icons/chart-bar.svg')}
+      title={intl.formatMessage(active ? messages.remove_poll : messages.add_poll)}
+      active={active}
+      disabled={disabled}
+      onClick={onClick}
+    />
+  );
+};
+
+export default PollButton;

app/soapbox/features/compose/components/spoiler_button.tsx

@@ -0,0 +1,29 @@
+import React from 'react';
+import { defineMessages, useIntl } from 'react-intl';
+
+import ComposeFormButton from './compose_form_button';
+
+const messages = defineMessages({
+  marked: { id: 'compose_form.spoiler.marked', defaultMessage: 'Text is hidden behind warning' },
+  unmarked: { id: 'compose_form.spoiler.unmarked', defaultMessage: 'Text is not hidden' },
+});
+
+interface ISpoilerButton {
+  active?: boolean,
+  onClick: () => void,
+}
+
+const SpoilerButton: React.FC<ISpoilerButton> = ({ active, onClick }) => {
+  const intl = useIntl();
+
+  return (
+    <ComposeFormButton
+      icon={require('@tabler/icons/icons/alert-triangle.svg')}
+      title={intl.formatMessage(active ? messages.marked : messages.unmarked)}
+      active={active}
+      onClick={onClick}
+    />
+  );
+};
+
+export default SpoilerButton;