diff --git a/diigo-cache/README.md b/diigo-cache/README.md
index 2d189ca..cfc4cae 100644
--- a/diigo-cache/README.md
+++ b/diigo-cache/README.md
@@ -85,12 +85,13 @@ const ndjson = await env.DIIGO.dumpNdjson(4, 24);
 
 ## Test
 
-    pnpm test
+    pnpm types  # regenerate worker-configuration.d.ts (after wrangler.jsonc changes)
+    pnpm lint   # fails if those types are stale; tsc over src/ and tests/
+    pnpm test   # vitest
 
-Runs the real worker and both DOs in the vitest pool, with `WEBAPP`
-bound to [a fake webapp](tests/fake-webapp.js) serving diigo-shaped
-items (`wrangler.tests.jsonc`). vitest is borrowed from
-`../diigo-bookmarks/node_modules` (see `vitest.config.ts`).
+Tests run the real worker and both DOs in the vitest pool, with
+`WEBAPP` bound to [a fake webapp](tests/fake-webapp.js) serving
+diigo-shaped items (`wrangler.tests.jsonc`).
 
 ## Run, deploy
 
diff --git a/diigo-cache/package.json b/diigo-cache/package.json
index 193f8aa..4bead99 100644
--- a/diigo-cache/package.json
+++ b/diigo-cache/package.json
@@ -4,10 +4,14 @@
 	"type": "module",
 	"scripts": {
 		"dev": "wrangler dev -c wrangler.jsonc -c ../webapp/wrangler.jsonc",
-		"test": "vitest run",
-		"typecheck": "tsc -p tsconfig.check.json"
+		"types": "wrangler types",
+		"lint": "wrangler types --check && tsc -p tsconfig.json && tsc -p tests/tsconfig.json",
+		"test": "vitest run"
 	},
 	"devDependencies": {
+		"@cloudflare/vitest-plugin": "1.3.6",
+		"typescript": "^5.9.0",
+		"vitest": "4.1.11",
 		"wrangler": "^4.148.0"
 	}
 }
diff --git a/diigo-cache/tests/tsconfig.json b/diigo-cache/tests/tsconfig.json
new file mode 100644
index 0000000..d251ee9
--- /dev/null
+++ b/diigo-cache/tests/tsconfig.json
@@ -0,0 +1,8 @@
+{
+	"extends": "../tsconfig.json",
+	"compilerOptions": {
+		"types": ["@cloudflare/vitest-plugin/types"],
+		"allowJs": true
+	},
+	"include": ["./**/*", "../worker-configuration.d.ts"]
+}
diff --git a/diigo-cache/vitest.config.ts b/diigo-cache/vitest.config.ts
index 37b1516..e1d362a 100644
--- a/diigo-cache/vitest.config.ts
+++ b/diigo-cache/vitest.config.ts
@@ -1,9 +1,5 @@
 import { defineProject } from "vitest/config";
-// the plugin resolves from diigo-bookmarks's store (the one vitest
-// install on disk); direct-path import sidesteps pnpm's exports-map
-// restriction *for the config file*. cloudflareTest (the plugin form,
-// not the bare pool) is what provides the `cloudflare:test` module.
-import { cloudflareTest } from "../diigo-bookmarks/node_modules/.pnpm/@cloudflare+vitest-plugin@1.3.6_@cloudflare+workers-types@5.20261005.1_@types+node@26.6.4_@vi_7mty7nznaeeyt2ohspxbzj4p6m/node_modules/@cloudflare/vitest-plugin/dist/pool/index.mjs";
+import { cloudflareTest } from "@cloudflare/vitest-plugin";
 
 export default defineProject({
 	plugins: [