storybook: Source: prettierConfig doesn't work

Describe the bug When I try to configure source-loader it just doesn’t work.

System

Environment Info:

  System:
    OS: Linux 5.4 Ubuntu 20.04.2 LTS (Focal Fossa)
    CPU: (8) x64 Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz
  Binaries:
    Node: 14.17.2 - ~/.nvm/versions/node/v14.17.2/bin/node
    npm: 6.14.13 - ~/.nvm/versions/node/v14.17.2/bin/npm
  Browsers:
    Chrome: 91.0.4472.114
    Firefox: 89.0.2
  npmPackages:
    @storybook/addon-actions: ^6.3.4 => 6.3.4 
    @storybook/addon-docs: ^6.3.4 => 6.3.4 
    @storybook/addon-essentials: ^6.3.4 => 6.3.4 
    @storybook/addon-links: ^6.3.4 => 6.3.4 
    @storybook/node-logger: ^6.3.4 => 6.3.4 
    @storybook/preset-create-react-app: ^3.2.0 => 3.2.0 
    @storybook/react: ^6.3.4 => 6.3.4 

Additional context

module.exports = {
  webpackFinal: async (config, { configType }) => {
    config.module.rules.push({
      test: /\.stories\.tsx?$/,
      loaders: [
        {
          loader: require.resolve('@storybook/source-loader'),
          options: {
            parser: 'typescript',
            options: {
              prettierConfig: {
                printWidth: 100,
                singleQuote: true,
              },
            },
          },
        },
      ],
      enforce: 'pre',
    });

    return config;
  },
  stories: ['../src/**/*.stories.mdx', '../src/**/*.stories.@(js|jsx|ts|tsx)'],
  addons: [
    '@storybook/addon-links',
    '@storybook/preset-create-react-app',
    {
      name: '@storybook/addon-docs',
      options: {
        sourceLoaderOptions: null,
      },
    },
    '@storybook/addon-essentials',
  ],
};