🍿 Minor Changes

• #13352 cb886dc Thanks @delucis! - Adds support for a new experimental.headingIdCompat flag

  By default, Astro removes a trailing - from the end of IDs it generates for headings ending with special characters. This differs from the behavior of common Markdown processors.

  You can now disable this behavior with a new configuration flag:

  import { defineConfig } from 'astro/config';
  
  export default defineConfig({
    experimental: {
      headingIdCompat: true,
    },
  });

  This can be useful when heading IDs and anchor links need to behave consistently across your site and other platforms such as GitHub and npm.

  If you are using the rehypeHeadingIds plugin directly, you can also pass this new option:

  import { defineConfig } from 'astro/config';
  import { rehypeHeadingIds } from '@astrojs/markdown-remark';
  import { otherPluginThatReliesOnHeadingIDs } from 'some/plugin/source';
  
  export default defineConfig({
    markdown: {
      rehypePlugins: [
        [rehypeHeadingIds, { experimentalHeadingIdCompat: true }],
        otherPluginThatReliesOnHeadingIDs,
      ],
    },
  });

• #13311 a3327ff Thanks @chrisirhc! - Adds a new configuration option for Markdown syntax highlighting excludeLangs

  This option provides better support for diagramming tools that rely on Markdown code blocks, such as Mermaid.js and D2 by allowing you to exclude specific languages from Astro’s default syntax highlighting.

  This option allows you to avoid rendering conflicts with tools that depend on the code not being highlighted without forcing you to disable syntax highlighting for other code blocks.

  The following example configuration will exclude highlighting for mermaid and math code blocks:

  import { defineConfig } from 'astro/config';
  
  export default defineConfig({
    markdown: {
      syntaxHighlight: {
        type: 'shiki',
        excludeLangs: ['mermaid', 'math'],
      },
    },
  });

  Read more about this new option in the Markdown syntax highlighting configuration docs.