Official Plugin

gatsby-remark-autolink-headers

Adds GitHub-style hover links to headers in your markdown files when they’re rendered.

This is a sub-plugin for gatsby-transformer-remark. As demoed below, add this plugin to the options of gatsby-transformer-remark.

Install

npm install --save gatsby-remark-autolink-headers

How to use

// In your gatsby-config.js
module.exports = {
  plugins: [
    {
      resolve: `gatsby-transformer-remark`,
      options: {
        plugins: [`gatsby-remark-autolink-headers`],
      },
    },
  ],
}

Note: if you are using gatsby-remark-prismjs, make sure that it’s listed after this plugin. Otherwise, you might face an issue described here: https://github.com/gatsbyjs/gatsby/issues/5764.

// good
{
  resolve: `gatsby-transformer-remark`,
  options: {
    plugins: [
      `gatsby-remark-autolink-headers`,
      `gatsby-remark-prismjs`,
    ],
  },
}

// bad
{
  resolve: `gatsby-transformer-remark`,
  options: {
    plugins: [
      `gatsby-remark-prismjs`, // should be placed after `gatsby-remark-autolink-headers`
      `gatsby-remark-autolink-headers`,
    ],
  },
}

Options

offsetY: Signed integer. Vertical offset value in pixels (optional)
icon: SVG shape inside a template literal or boolean false. Set your own svg or disable icon (optional)
className: String. Set your own class for the anchor (optional)
maintainCase: Boolean. Maintains the case for markdown header (optional)
removeAccents: Boolean. Remove accents from generated headings IDs (optional)
enableCustomId: Boolean. Enable custom header IDs with {#id} (optional)
isIconAfterHeader: Boolean. Enable the anchor icon to be inline at the end of the header text (optional)

// In your gatsby-config.js
module.exports = {
  plugins: [
    {
      resolve: `gatsby-transformer-remark`,
      options: {
        plugins: [
          {
            resolve: `gatsby-remark-autolink-headers`,
            options: {
              offsetY: `100`,
              icon: `<svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>`,
              className: `custom-class`,
              maintainCase: true,
              removeAccents: true,
              isIconAfterHeader: true,
            },
          },
        ],
      },
    },
  ],
}

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