feat: add null driver

docs/2.drivers/null.md

@@ -0,0 +1,20 @@
+---
+icon: bi:trash3-fill
+---
+
+# Null
+
+> Discards all data.
+
+::warning
+This driver does NOT store any data. It will discard any data written to it and will always return null similar to [`/dev/null`](https://en.wikipedia.org/wiki/Null_device)
+::
+
+```js
+import { createStorage } from "unstorage";
+import nullDriver from "unstorage/drivers/null";
+
+const storage = createStorage({
+  driver: nullDriver(),
+});
+```

src/drivers/null.ts

@@ -0,0 +1,32 @@
+import { defineDriver } from "./utils";
+
+const DRIVER_NAME = "null";
+
+export default defineDriver<void>(() => {
+  return {
+    name: DRIVER_NAME,
+    hasItem() {
+      return false;
+    },
+    getItem() {
+      return null;
+    },
+    getItemRaw() {
+      return null;
+    },
+    getItems() {
+      return [];
+    },
+    getMeta() {
+      return null;
+    },
+    getKeys() {
+      return [];
+    },
+    setItem() {},
+    setItemRaw() {},
+    setItems() {},
+    removeItem() {},
+    clear() {},
+  };
+});

src/index.ts

@@ -22,6 +22,7 @@ export const builtinDrivers = {
   memory: "unstorage/drivers/memory",
   mongodb: "unstorage/drivers/mongodb",
   netlifyBlobs: "unstorage/drivers/netlify-blobs",
+  null: "unstorage/drivers/null",
   overlay: "unstorage/drivers/overlay",
   planetscale: "unstorage/drivers/planetscale",
   redis: "unstorage/drivers/redis",

test/drivers/null.test.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from "vitest";
+import driver from "../../src/drivers/null";
+import { createStorage } from "../../src";
+
+describe("drivers: null", async () => {
+  const storage = createStorage({ driver: driver() });
+  it("setItem", async () => {
+    await storage.setItem("key", "value");
+  });
+  it("getItem", async () => {
+    expect(await storage.getItem("key")).toEqual(null);
+  });
+});