chore: align error message when read(...) fails in an edge function (#14306)

* fix

* changesets

* prettier

Author: teemingc

.changeset/famous-lands-bathe.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-cloudflare': patch
+---
+
+fix: improve the error message when `read(...)` fails

.changeset/quick-seals-accept.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-netlify': patch
+---
+
+fix: improve the error message when `read(...)` fails from an edge function

packages/adapter-cloudflare/src/worker.js

@@ -21,12 +21,17 @@ const initialized = server.init({
 	// @ts-expect-error env contains environment variables and bindings
 	env,
 	read: async (file) => {
+		const url = `${origin}/${file}`;
 		const response = await /** @type {{ ASSETS: { fetch: typeof fetch } }} */ (env).ASSETS.fetch(
-			`${origin}/${file}`
+			url
 		);
+
 		if (!response.ok) {
-			throw new Error(`Failed to fetch ${file}: ${response.status} ${response.statusText}`);
+			throw new Error(
+				`read(...) failed: could not fetch ${url} (${response.status} ${response.statusText})`
+			);
 		}
+
 		return response.body;
 	}
 });

packages/adapter-netlify/src/edge.js

@@ -14,10 +14,15 @@ const initialized = server.init({
 	// @ts-ignore
 	env: Deno.env.toObject(),
 	read: async (file) => {
-		const response = await fetch(`${origin}/${file}`);
+		const url = `${origin}/${file}`;
+		const response = await fetch(url);
+
 		if (!response.ok) {
-			throw new Error(`Failed to fetch ${file}: ${response.status} ${response.statusText}`);
+			throw new Error(
+				`read(...) failed: could not fetch ${url} (${response.status} ${response.statusText})`
+			);
 		}
+
 		return response.body;
 	}
 });