fix(#10761): graph errors reported as diagnostics for Deno.emit() (#10767)

Fixes #10761

cli/tests/compiler_api_test.ts

@@ -456,3 +456,49 @@ Deno.test({
     assert(files["deno:///bundle.js.map"]);
   },
 });
+
+Deno.test({
+  name: `Deno.emit() - graph errors as diagnostics`,
+  ignore: Deno.build.os === "windows",
+  async fn() {
+    const { diagnostics } = await Deno.emit("/a.ts", {
+      sources: {
+        "/a.ts": `import { b } from "./b.ts";
+        console.log(b);`,
+      },
+    });
+    assert(diagnostics);
+    assertEquals(diagnostics, [
+      {
+        category: 1,
+        code: 2305,
+        start: { line: 0, character: 9 },
+        end: { line: 0, character: 10 },
+        messageText:
+          `Module '"deno:///missing_dependency.d.ts"' has no exported member 'b'.`,
+        messageChain: null,
+        source: null,
+        sourceLine: 'import { b } from "./b.ts";',
+        fileName: "file:///a.ts",
+        relatedInformation: null,
+      },
+      {
+        category: 1,
+        code: 900001,
+        start: null,
+        end: null,
+        messageText: "Unable to find specifier in sources: file:///b.ts",
+        messageChain: null,
+        source: null,
+        sourceLine: null,
+        fileName: "file:///b.ts",
+        relatedInformation: null,
+      },
+    ]);
+    assert(
+      Deno.formatDiagnostics(diagnostics).includes(
+        "Unable to find specifier in sources: file:///b.ts",
+      ),
+    );
+  },
+});