diff --git a/cozo-lib-nodejs/index.d.ts b/cozo-lib-nodejs/index.d.ts
new file mode 100644
index 00000000..a0c305dd
--- /dev/null
+++ b/cozo-lib-nodejs/index.d.ts
@@ -0,0 +1,73 @@
+declare module "cozo-node" {
+  export class CozoDb {
+    /**
+     * Constructor
+     *
+     * @param engine:  defaults to 'mem', the in-memory non-persistent engine.
+     *                 'sqlite', 'rocksdb' and maybe others are available,
+     *                 depending on compile time flags.
+     * @param path:    path to store the data on disk, defaults to 'data.db',
+     *                 may not be applicable for some engines such as 'mem'
+     * @param options: defaults to {}, ignored by all the engines in the published NodeJS artefact
+     */
+    constructor(engine?: string, path?: string, options?: object);
+
+    /**
+     * You must call this method for any database you no longer want to use:
+     * otherwise the native resources associated with it may linger for as
+     * long as your program runs. Simply `delete` the variable is not enough.
+     */
+    close(): void;
+
+    /**
+     * Runs a query
+     *
+     * @param script: the query
+     * @param params: the parameters as key-value pairs, defaults to {}
+     */
+    run(script: string, params?: Record<string, any>): Promise<any>;
+
+    /**
+     * Export several relations
+     *
+     * @param relations:  names of relations to export, in an array.
+     */
+    exportRelations(relations: Array<string>): Promise<any>;
+
+    /**
+     * Import several relations.
+     *
+     * Note that triggers are _not_ run for the relations, if any exists.
+     * If you need to activate triggers, use queries with parameters.
+     *
+     * @param data: in the same form as returned by `exportRelations`. The relations
+     *              must already exist in the database.
+     */
+    importRelations(data: object): Promise<object>;
+
+    /**
+     * Backup database
+     *
+     * @param path: path to file to store the backup.
+     */
+    backup(path: string): Promise<any>;
+
+    /**
+     * Restore from a backup. Will fail if the current database already contains data.
+     *
+     * @param path: path to the backup file.
+     */
+    restore(path: string): Promise<object>;
+
+    /**
+     * Import several relations from a backup. The relations must already exist in the database.
+     *
+     * Note that triggers are _not_ run for the relations, if any exists.
+     * If you need to activate triggers, use queries with parameters.
+     *
+     * @param path: path to the backup file.
+     * @param rels: the relations to import.
+     */
+    importRelationsFromBackup(path: string, rels: Array<string>): Promise<any>;
+  }
+}
diff --git a/cozo-lib-nodejs/package.json b/cozo-lib-nodejs/package.json
index 5f601f3a..9474fa91 100644
--- a/cozo-lib-nodejs/package.json
+++ b/cozo-lib-nodejs/package.json
@@ -3,8 +3,10 @@
   "version": "0.6.0",
   "description": "Cozo database for NodeJS",
   "main": "index",
+  "types": "index.d.ts",
   "files": [
     "index.js",
+    "index.d.ts",
     "LICENSE.txt"
   ],
   "binary": {
@@ -43,4 +45,4 @@
   "dependencies": {
     "@mapbox/node-pre-gyp": "^1.0.10"
   }
-}
\ No newline at end of file
+}
diff --git a/signatures/version1/cla.json b/signatures/version1/cla.json
index 8f2ad641..fd561729 100644
--- a/signatures/version1/cla.json
+++ b/signatures/version1/cla.json
@@ -15,6 +15,14 @@
       "created_at": "2023-02-01T19:34:43Z",
       "repoId": 551374215,
       "pullRequestNo": 39
+    },
+    {
+      "name": "chuanqisun",
+      "id": 1895289,
+      "comment_id": 1519422437,
+      "created_at": "2023-04-24T05:55:45Z",
+      "repoId": 551374215,
+      "pullRequestNo": 63
     }
   ]
 }
\ No newline at end of file