message: Changed types to be more specific
diff: @@ -20,6 +20,7 @@ import gfm from 'remark-gfm';
  import React from 'react';
  import { BackstageTheme } from '@backstage/theme';
  import { CodeSnippet } from '../CodeSnippet';
  +import { HeadingProps } from 'react-markdown/lib/ast-to-react';
  export type MarkdownContentClassKey = 'markdown';
  @@ -73,13 +74,15 @@ type Props = {
  className?: string;
  };
  -const flatten = (text, child) => {
  +const flatten = (text: string, child: any): string => {
  + if (!child) return text;
  +
  return typeof child === 'string'
  ? text + child
  : React.Children.toArray(child.props.children).reduce(flatten, text);
  };
  -const headingRenderer = ({ level, children }) => {
  +const headingRenderer = ({ level, children }: HeadingProps) => {
  const childrenArray = React.Children.toArray(children);
  const text = childrenArray.reduce(flatten, '');
  const slug = text.toLocaleLowerCase('en-US').replace(/\W/g, '-');
  