update notes

Author: pieh

adapters-notes.md

@@ -1,13 +1,30 @@
 ## Feedback
 
-- Files from `public` not in `outputs.staticFiles`
+- Files from `public` directory not listed in `outputs.staticFiles`
 - In `onBuildComplete` - `config.images.remotePatterns` type is `(RemotePattern | URL)[]` but in
   reality `URL` inputs are converted to `RemotePattern` so type should be just `RemotePattern[]`
 - `routes.headers` does not contain immutable cache-control headers for \_next/static
 - `outputs.middleware` does not contain env that exist in `middleware-manifest.json` (i.e.
   NEXT_SERVER_ACTIONS_ENCRYPTION_KEY, **NEXT_PREVIEW_MODE_ID, **NEXT_PREVIEW_MODE_SIGNING_KEY etc)
 - `outputs.middleware.config.matchers` can be undefined per types - can that ever happen? Can we
   just have empty array instead to simplify handling.
+- `outputs.staticFiles` (i18n enabled) custom fully static (no `getStaticProps`) `/pages/404.js`
+  `filePath` point to not existing file (it's not i18n locale prefix in `staticFiles` array, actual
+  404.html are written to i18n locale prefixed dirs)
+- `outputs.staticFiles` (i18n enabled) custom `/pages/404.js` with `getStaticProps` result in fatal
+  `Error: Invariant: failed to find source route /en/404 for prerender /en/404` directly from
+  Next.js:
+
+  ```
+  ⨯ Failed to run onBuildComplete from Netlify
+
+    > Build error occurred
+    Error: Invariant: failed to find source route /en/404 for prerender /en/404
+  ```
+
+  (additionally - invariant is reported as failing to run `onBuildComplete` from adapter, but it
+  happens before adapter's `onBuildComplete` runs, would be good to clear this up a bit so users
+  could report issues in correct place in such cases. Not that important for nearest future)
 
 ## Plan
 
@@ -18,15 +35,15 @@
 2. We will use adapters API where it's most helpful:
 
 - adjusting next config:
-  - set standalone mode instead of using "private" env var (for now at least we will continue with
-    standalone mode as using outputs other than middleware require bigger changes which will be
+  - [done] set standalone mode instead of using "private" env var (for now at least we will continue
+    with standalone mode as using outputs other than middleware require bigger changes which will be
     explored in later phases)
-  - set image loader (url generator) to use Netlify Image CDN directly (no need for \_next/image
-    rewrite then)
+  - [done] set image loader (url generator) to use Netlify Image CDN directly (no need for
+    \_next/image rewrite then)
   - (maybe/explore) set build time cache handler to avoid having to read output of default cache
     handler and convert those files into blobs to upload later
-- use middleware output to generate middleware edge function
-- don't glob for static files and use `outputs.staticFiles` instead
+- [partially done - for edge runtime] use middleware output to generate middleware edge function
+- [done] don't glob for static files and use `outputs.staticFiles` instead
 - don't read various manifest files manually and use provided context in `onBuildComplete` instead
 
 ## To figure out
@@ -36,3 +53,5 @@
   packagePath, publishDir etc)
 - Looking forward - Platform change to accept a list of files to upload to cdn (avoids file system
   operations such as `cp`)
+- Looking forward - allow using regexes for static headers matcher (needed to apply next.config.js
+  defined headers to apply to static assets)