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----
-'astro': major
-'@astrojs/markdown-remark': major
-'@astrojs/mdx': minor
----
-
-Give remark and rehype plugins access to user frontmatter via frontmatter injection. This means `data.astro.frontmatter` is now the _complete_ Markdown or MDX document's frontmatter, rather than an empty object.
-
-This allows plugin authors to modify existing frontmatter, or compute new properties based on other properties. For example, say you want to compute a full image URL based on an `imageSrc` slug in your document frontmatter:
-
-```ts
-export function remarkInjectSocialImagePlugin() {
-  return function (tree, file) {
-    const { frontmatter } = file.data.astro;
-    frontmatter.socialImageSrc = new URL(
-      frontmatter.imageSrc,
-      'https://my-blog.com/',
-    ).pathname;
-  }
-}
-```
-
-#### Content Collections - new `remarkPluginFrontmatter` property
-
-We have changed _inject_ frontmatter to _modify_ frontmatter in our docs to improve discoverability. This is based on support forum feedback, where "injection" is rarely the term used.
-
-To reflect this, the `injectedFrontmatter` property has been renamed to `remarkPluginFrontmatter`. This should clarify this plugin is still separate from the `data` export Content Collections expose today.
-
-
-#### Migration instructions
-
-Plugin authors should now **check for user frontmatter when applying defaults.**
-
-For example, say a remark plugin wants to apply a default `title` if none is present. Add a conditional to check if the property is present, and update if none exists:
-
-```diff
-export function remarkInjectTitlePlugin() {
-  return function (tree, file) {
-    const { frontmatter } = file.data.astro;
-+    if (!frontmatter.title) {
-      frontmatter.title = 'Default title';
-+    }
-  }
-}
-```
-
-This differs from previous behavior, where a Markdown file's frontmatter would _always_ override frontmatter injected via remark or reype.