Storybook - Cannot add comment to a function in .ts file

Current Behavior

I have a setup with Storybook, from the official template. When I try to add a comment to my function, storybook throws the following error: The file has only 43 lines of code, so the second error does not even make sense to me. It only occurs, if the function is exported.

/** This comment is fine */
const foo = () => {}

Empty comment also works, even if exported (either named or default export works)

/** */
export const foo = () => {}

Any comment with export (either named or default) fails.

/** This comment gives the above mentioned error */
const foo = () => {}
export default foo

Expected behavior

Should allow adding comments to functions

Additional context

I only did one change to the original template, I like to keep related code next to each other, so I changed the folder structure:

src/
    |_Foo/
       |_index.tsx
       |_the_file_with_the_function_that_throws_error_on_comment.ts
       |_index.stories.tsx

The `.storybook/main.js` file:

  module.exports = {
    stories: ['../src/**/*.stories.(ts|tsx)'],
    addons: ['@storybook/addon-actions', '@storybook/addon-links', '@storybook/addon-docs'],
    webpackFinal: async (config) => {
      config.module.rules.push({
        test: /\.(ts|tsx)$/,
        use: [
          {
            loader: require.resolve('ts-loader'),
            options: {
              transpileOnly: true,
            },
          },
          {
            loader: require.resolve('react-docgen-typescript-loader'),
          },
        ],
      });
      config.resolve.extensions.push('.ts', '.tsx');
      return config;
    },
  };

Your environment

Software	Version(s)
TSDX	0.13.1
TypeScript	3.8.3
Browser	83.0.4093.3 dev (64-bit)
npm/Yarn	6.9.0/1.21.1
Node	12.6
Operating System	Linux 19.10

jaredpalmer / tsdx