chore: migrate tar tests to vitest (#21406)

site/test/vitestSetup.ts

@@ -0,0 +1,10 @@
+import { Blob as NativeBlob } from "node:buffer";
+
+// JSDom `Blob` is missing important methods[1] that have been standardized for
+// years. MDN categorizes this API as baseline[2].
+// [1]: https://github.com/jsdom/jsdom/issues/2555
+// [2]: https://developer.mozilla.org/en-US/docs/Web/API/Blob/arrayBuffer
+// @ts-expect-error - Minor type incompatibilities due to TypeScript's
+// introduction of the `ArrayBufferLife` type and the related generic parameters
+// changes.
+globalThis.Blob = NativeBlob;

site/vite.config.mts

@@ -137,7 +137,7 @@ export default defineConfig({
 		include: ["src/**/*.test.?(m)ts?(x)"],
 		globals: true,
 		environment: "jsdom",
-		setupFiles: ["@testing-library/jest-dom/vitest"],
+		setupFiles: ["@testing-library/jest-dom/vitest", "./test/vitestSetup.ts"],
 		silent: "passed-only",
 	},
 });