This addon for Storybook adds a tab that displays the compiled HTML for each story. It uses highlight.js for syntax highlighting.

Version 6 of this addon requires Storybook 8 and Prettier 3. If you are still using Storybook 7, you can use version 5.

Install the addon and its dependencies.

With NPM:

npm i --save-dev @whitespace/storybook-addon-html prettier react-syntax-highlighter

With Yarn:

yarn add -D @whitespace/storybook-addon-html prettier react-syntax-highlighter

// .storybook/main.js

module.exports = {
  // ...
  addons: [
    "@whitespace/storybook-addon-html",
    // ...
  ],
};

The HTML is formatted with Prettier. You can override the Prettier config (except parser and plugins) by providing an object following the Prettier API override format in the html parameter:

// .storybook/preview.js

export const parameters = {
  // ...
  html: {
    prettier: {
      tabWidth: 4,
      useTabs: false,
      htmlWhitespaceSensitivity: "strict",
    },
  },
};

You can override the wrapper element selector used to grab the component HTML.

export const parameters = {
  html: {
    root: "#my-custom-wrapper", // default: #root
  },
};

Some frameworks put comments inside the HTML. If you want to remove these you can use the removeComments parameter. Set it to true to remove all comments or set it to a regular expression that matches the content of the comments you want to remove.

export const parameters = {
  html: {
    removeComments: /^\s*remove me\s*$/, // default: false
  },
};

You can also use the removeEmptyComments parameter to remove only empty comments like <!----> and <!-- -->.

export const parameters = {
  html: {
    removeEmptyComments: true, // default: false
  },
};

You can override the showLineNumbers and wrapLines settings for the syntax highlighter by using the highlighter parameter:

export const parameters = {
  html: {
    highlighter: {
      showLineNumbers: true, // default: false
      wrapLines: false, // default: true
    },
  },
};

Another way of hiding unwanted code is to define the transform option. It allows you to perform any change to the output code, e.g. removing attributes injected by frameworks.

html: {
  transform: (code) => {
    // Remove attributes `_nghost` and `ng-reflect` injected by Angular:
    return code.replace(/(?:_nghost|ng-reflect).*?="[\S\s]*?"/g, "");
  };
}