diff --git a/.gitignore b/.gitignore
index 3a1f1fd..aec2bbe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,7 +3,7 @@ node_modules
 pnpm-lock.yaml
 package-lock.json
 coverage
-**/*.d.ts
+lib/**/*.d.ts
 *~
 
 # For misc scripts and experiments:
diff --git a/declarations/obz.d.ts b/declarations/obz.d.ts
new file mode 100644
index 0000000..11de2fc
--- /dev/null
+++ b/declarations/obz.d.ts
@@ -0,0 +1,10 @@
+declare module 'obz' {
+  type Remove = () => void
+  export interface Obz<X> {
+    (listener: (value: X) => void): Remove
+    set(value: X): unknown
+    value: X
+  }
+  function createObz(): Obz
+  export = createObz
+}
\ No newline at end of file
diff --git a/lib/index.js b/lib/index.js
index 70a1eac..958318c 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,4 +1,3 @@
-// @ts-ignore
 const Obz = require('obz')
 const MsgV4 = require('ppppp-db/msg-v4')
 
@@ -24,9 +23,7 @@ const PREFIX = 'set_v1__'
  *   del: Array<string>,
  *   supersedes: Array<MsgID>,
  * }} SetMsgData
- * @typedef {{
- *   set: (ev: { event: 'add' | 'del', subdomain: string, value: string }) => void
- * }} ObzType
+ * @typedef {{ event: 'add' | 'del', subdomain: string, value: string }} Event
  * @typedef {{
  *   set?: {
  *     ghostSpan?: number
@@ -39,6 +36,11 @@ const PREFIX = 'set_v1__'
  * @typedef {import('ppppp-db/msg-v4').Msg<T>} Msg<T>
  */
 
+/**
+ * @template T
+ * @typedef {import('obz').Obz<T>} ObzType
+ */
+
 /**
  * @template T
  * @typedef {T extends void ?
@@ -84,7 +86,7 @@ function initSet(peer, config) {
   let loadedAccountID = /** @type {string | null} */ (null)
   let loadPromise = /** @type {Promise<void> | null} */ (null)
   let cancelOnRecordAdded = /** @type {CallableFunction | null} */ (null)
-  const watch = /**@type {ObzType}*/ (Obz())
+  const watch = /**@type {ObzType<Event>}*/ (Obz())
   const tangles = /** @type {Map<Subdomain, MsgV4.Tangle>} */ (new Map())
 
   const itemRoots = {
diff --git a/tsconfig.json b/tsconfig.json
index cc6e7af..7bd7313 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,5 +1,5 @@
 {
-  "include": ["lib/**/*.js"],
+  "include": ["declarations", "lib/**/*.js"],
   "exclude": ["coverage/", "node_modules/", "test/"],
   "compilerOptions": {
     "checkJs": true,
@@ -11,6 +11,7 @@
     "module": "node16",
     "skipLibCheck": true,
     "strict": true,
-    "target": "es2022"
+    "target": "es2022",
+    "typeRoots": ["node_modules/@types", "declarations"]
   }
 }
\ No newline at end of file