fix: guard Deno global access in build-id for browser compat

build-id/mod.ts uses Deno.env.get() which throws in the browser.
The old deno.ts plugin transformed this away, but @deno/vite-plugin
serves it to the client untransformed.

Also:
- Add exclude option to @deno/vite-plugin config to skip Fresh
  virtual module IDs (fresh-island::, fresh-client-island::, fresh:)
- Skip Fresh virtual module prefixes in freshSsrTransform resolveId

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bartlomieju

packages/build-id/mod.ts

@@ -14,13 +14,16 @@
 
 import { encodeHex } from "@std/encoding/hex";
 
-export const DENO_DEPLOYMENT_ID: string | undefined = Deno.env.get(
+// deno-lint-ignore no-explicit-any
+const _Deno = typeof Deno !== "undefined" ? Deno : undefined as any;
+
+export const DENO_DEPLOYMENT_ID: string | undefined = _Deno?.env.get(
   "DENO_DEPLOYMENT_ID",
 );
 const deploymentId = DENO_DEPLOYMENT_ID ||
   // For CI
-  Deno.env.get("GITHUB_SHA") ||
-  Deno.env.get("CI_COMMIT_SHA") ||
+  _Deno?.env.get("GITHUB_SHA") ||
+  _Deno?.env.get("CI_COMMIT_SHA") ||
   crypto.randomUUID();
 const buildIdHash = await crypto.subtle.digest(
   "SHA-1",

packages/plugin-vite/src/mod.ts

@@ -277,6 +277,12 @@ export function fresh(config?: FreshViteConfig): Plugin[] {
         client: { platform: "browser", preserveJsx: true, cachedOnly: true },
       },
       onLoad: createFreshOnLoad(() => isDev),
+      exclude: [
+        "fresh-island",
+        "fresh-client-island",
+        "fresh:",
+        "@fresh/build-id",
+      ],
     };
     // deno-lint-ignore no-explicit-any
     plugins.push(...denoPlugin(denoOpts) as any);

packages/plugin-vite/src/plugins/deno_transforms.ts

@@ -78,11 +78,19 @@ export function freshSsrTransform(
         id.startsWith("\0") ||
         id.startsWith("node:") ||
         id.startsWith("npm:") ||
-        id.startsWith("jsr:")
+        id.startsWith("jsr:") ||
+        id.startsWith("fresh-island::") ||
+        id.startsWith("fresh-client-island::") ||
+        id.startsWith("fresh:")
       ) {
         return;
       }
 
+      // deno-lint-ignore no-console
+      console.log(
+        `[fresh:ssr-transform] resolveId: "${id}" (env: ${this.environment?.name})`,
+      );
+
       // Try to resolve through the Deno loader's import map
       try {
         const l = await loader();
@@ -91,16 +99,26 @@ export function freshSsrTransform(
           undefined,
           ResolutionMode.Import,
         );
+        // deno-lint-ignore no-console
+        console.log(
+          `[fresh:ssr-transform] loader resolved "${id}" -> "${resolved}"`,
+        );
         if (resolved && resolved !== id) {
           // Re-resolve the result through the plugin pipeline
           // so @deno/vite-plugin can create the proper deno:: specifier
           const result = await this.resolve(resolved, undefined, {
             ...options,
             skipSelf: true,
           });
+          // deno-lint-ignore no-console
+          console.log(
+            `[fresh:ssr-transform] pipeline re-resolved -> ${result?.id}`,
+          );
           return result;
         }
-      } catch {
+      } catch (err) {
+        // deno-lint-ignore no-console
+        console.log(`[fresh:ssr-transform] loader failed for "${id}": ${err}`);
         // Not resolvable by Deno — let Vite handle it
       }
     },