Add changelog for js returned content-type

src/content/changelog/workers/2025-08-25-workers-assets-javascript-content-type.mdx

@@ -0,0 +1,20 @@
+---
+title: Content type returned in Workers Assets for Javascript files is now `text/javascript`
+description: Updated JavaScript asset responses to use the standardized text/javascript Content-Type header (previously `application/javascript`) for better alignment with the HTML spec and browser expectations.
+products:
+  - workers
+date: 2025-08-25
+---
+
+JavaScript asset responses have been updated to use the `text/javascript` Content-Type header instead of `application/javascript`. While both MIME types are widely supported by browsers, the HTML Living Standard explicitly recommends `text/javascript` as the preferred type going forward.
+
+This change improves:
+
+- Standards alignment: Ensures consistency with the HTML spec and modern web platform guidance.
+- Interoperability: Some developer tools, validators, and proxies expect text/javascript and may warn or behave inconsistently with application/javascript.
+- Future-proofing: By following the spec-preferred MIME type, we reduce the risk of deprecation warnings or unexpected behavior in evolving browser environments.
+- Consistency: Most frameworks, CDNs, and hosting providers now default to text/javascript, so this change matches common ecosystem practice.
+
+Because all major browsers accept both MIME types, this update is backwards compatible and should not cause breakage.
+
+Users will see this change on the next deployment of their assets.