Load environment variables in deno SSR (#3483)

* Properly shim env in Deno

* Add test for loading env vars in Deno

* Add changeset

1 files changed, 20 insertions, 0 deletions

diff --git a/packages/integrations/deno/test/basics.test.js b/packages/integrations/deno/test/basics.test.js
index bc7322067..4a368e32d 100644
--- a/packages/integrations/deno/test/basics.test.js
+++ b/packages/integrations/deno/test/basics.test.js
@@ -5,6 +5,12 @@ async function startApp(cb) {
 	await runBuildAndStartApp('./fixtures/basics/', cb);
 }
 
+// this needs to be here and not in the specific test case, because
+// the variables are loaded in the global scope of the built server
+// module, which is only executed once upon the first load
+const varContent = 'this is a value stored in env variable';
+Deno.env.set('SOME_VARIABLE', varContent);
+
 Deno.test({
 	name: 'Basics',
 	async fn() {
@@ -39,3 +45,17 @@ Deno.test({
 		});
 	},
 });
+
+Deno.test({
+	name: 'Correctly loads run-time env variables',
+	async fn() {
+		await startApp(async () => {
+			const resp = await fetch('http://127.0.0.1:8085/');
+			const html = await resp.text();
+
+			const doc = new DOMParser().parseFromString(html, `text/html`);
+			const p = doc.querySelector('p#env-value');
+			assertEquals(p.innerText, varContent);
+		});
+	},
+});