Add missing type definitions

1 files changed, 2 insertions, 2 deletions

diff --git a/packages/react-shared/src/components/markdown_code_block.tsx b/packages/react-shared/src/components/markdown_code_block.tsx
index 2070bb8e1..49b2ff526 100644
--- a/packages/react-shared/src/components/markdown_code_block.tsx
+++ b/packages/react-shared/src/components/markdown_code_block.tsx
@@ -12,10 +12,10 @@ export interface MarkdownCodeBlockState {}
 export class MarkdownCodeBlock extends React.Component<MarkdownCodeBlockProps, MarkdownCodeBlockState> {
     // Re-rendering a codeblock causes any use selection to become de-selected. This is annoying when trying
     // to copy-paste code examples. We therefore noop re-renders on this component if it's props haven't changed.
-    public shouldComponentUpdate(nextProps: MarkdownCodeBlockProps, nextState: MarkdownCodeBlockState) {
+    public shouldComponentUpdate(nextProps: MarkdownCodeBlockProps, nextState: MarkdownCodeBlockState): boolean {
         return nextProps.value !== this.props.value || nextProps.language !== this.props.language;
     }
-    public render() {
+    public render(): React.ReactNode {
         return (
             <span style={{ fontSize: 14 }}>
                 <HighLight className={this.props.language || 'javascript'}>{this.props.value}</HighLight>