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There's no need for the plugin as both esbuild which is used by mdx-bundler and webpack / swc from nextjs will take care of it. It's intended for use in standalone applications.

Adding the plugin does have an effect (-> right-click -> view source):

• source of a blog post without the plugin
• source of a blog post with the plugin

esbuild / webpack / swc do minify the page but not the blog post.
It would probably make more sense to configure these build tools such that the blog post (and e.g. the json starting in line 2) is also minified. However, I haven't looked into the build setup too closely to fix this.

Thanks, good to know. Can we try turning on the minify option in esbuild? Mdx-bundler has an example over here. Would prefer this approach over a rehype plugin if this works.

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🔍 Inspect: https://vercel.com/timlrx/tailwind-nextjs-starter-blog/4Qnsz6iaE9KVCatzMFA3BATnHp38
✅ Preview: https://tailwind-nextjs-starter-blog-git-fork-alexanderze-7aadc9-timlrx.vercel.app

I'm not seeing any minification when using options.minify = true in the esbuildOptions.

Took a deeper look into this issue. Mdx-bundler sets minify to true by default. Changing it to false does show a difference.

The output from xdm is probably treated by esbuild as a string literal and it does not minify it. Hence the plugin is required, if we truly want to minimize the size of HTML over the wire. It seems to be relatively minor about 6% smaller and am not too sure how much longer it takes to process but happy to merge in the change. Thanks!