diff --git a/types/nano/index.d.ts b/types/nano/index.d.ts
index 59ff766010..37e7491436 100644
--- a/types/nano/index.d.ts
+++ b/types/nano/index.d.ts
@@ -31,8 +31,10 @@ declare namespace nano {
     dinosaur: RequestFunction;
     auth(username: string, userpass: string, callback?: Callback<any>): Request;
     session(callback?: Callback<any>): Request;
-    updates(params?: UpdatesParams, callback?: Callback<any>): Request;
-    followUpdates(params?: any, callback?: Callback<any>): EventEmitter;
+    updates(callback?: Callback<any>): Request;
+    updates(params: UpdatesParams, callback?: Callback<any>): Request;
+    followUpdates(callback?: Callback<any>): EventEmitter;
+    followUpdates(params: any, callback?: Callback<any>): EventEmitter;
     uuids(num: number, callback: Callback<any>): Request;
   }
 
@@ -42,145 +44,183 @@ declare namespace nano {
     destroy(name: string, callback?: Callback<any>): Request;
     list(callback?: Callback<any>): Request;
     use<D>(db: string): DocumentScope<D>;
-    compact(name: string, designname?: string, callback?: Callback<any>): Request;
+    compact(name: string, callback?: Callback<any>): Request;
+    compact(name: string, designname: string, callback?: Callback<any>): Request;
+    replicate<D>(
+      source: string | DocumentScope<D>,
+      target: string | DocumentScope<D>,
+      callback?: Callback<any>
+    ): Request
     replicate<D>(
       source: string | DocumentScope<D>,
       target: string | DocumentScope<D>,
       options?: any,
       callback?: Callback<any>
     ): Request;
-    changes(name: string, params?: any, callback?: Callback<any>): Request;
-    follow(
-      source: string,
-      params?: DatabaseScopeFollowUpdatesParams,
-      callback?: Callback<any>
-    ): EventEmitter;
-    followUpdates(params?: any, callback?: Callback<any>): EventEmitter;
-    updates(params?: UpdatesParams, callback?: Callback<any>): Request;
+    changes(name: string, callback?: Callback<any>): Request;
+    changes(name: string, params: any, callback?: Callback<any>): Request;
+    follow(source: string, callback?: Callback<any>): EventEmitter;
+    follow(source: string, params: DatabaseScopeFollowUpdatesParams, callback?: Callback<any>): EventEmitter;
+    followUpdates(callback?: Callback<any>): EventEmitter;
+    followUpdates(params: any, callback?: Callback<any>): EventEmitter;
+    updates(callback?: Callback<any>): Request;
+    updates(params: UpdatesParams, callback?: Callback<any>): Request;
   }
 
   interface DocumentScope<D> {
     readonly config: ServerConfig;
     info(callback?: Callback<any>): Request;
+    replicate<D>(
+      target: string | DocumentScope<D>,
+      callback?: Callback<any>
+    ): Request
     replicate(
       target: string | DocumentScope<D>,
-      options?: any,
-      callback?: Callback<any>
-    ): Request;
-    compact(callback?: Callback<any>): Request;
-    changes(params?: any, callback?: Callback<any>): Request;
-    follow(
-      params?: DocumentScopeFollowUpdatesParams,
-      callback?: Callback<any>
-    ): EventEmitter;
-    auth(username: string, userpass: string, callback?: Callback<any>): Request;
-    session(callback?: Callback<any>): Request;
-    insert(document: any, params?: any, callback?: Callback<any>): Request;
-    get(docname: string, params?: any, callback?: Callback<any>): Request;
-    head(docname: string, callback: Callback<any>): Request;
-    copy(
-      src_document: string,
-      dst_document: string,
       options: any,
       callback?: Callback<any>
     ): Request;
+    compact(callback?: Callback<any>): Request;
+    changes(callback?: Callback<any>): Request;
+    changes(params: any, callback?: Callback<any>): Request;
+    follow(callback?: Callback<any>): EventEmitter;
+    follow(params: DocumentScopeFollowUpdatesParams, callback?: Callback<any>): EventEmitter;
+    auth(username: string, userpass: string, callback?: Callback<any>): Request;
+    session(callback?: Callback<any>): Request;
+    insert(document: any, callback?: Callback<any>): Request;
+    insert(document: any, params: any, callback?: Callback<any>): Request;
+    get(docname: string, callback?: Callback<any>): Request;
+    get(docname: string, params: any, callback?: Callback<any>): Request;
+    head(docname: string, callback: Callback<any>): Request;
+    copy(src_document: string, dst_document: string, callback?: Callback<any>): Request;
+    copy(src_document: string, dst_document: string, options: any, callback?: Callback<any>): Request;
     destroy(docname: string, rev: string, callback?: Callback<any>): Request;
-    bulk(
-      docs: BulkModifyDocsWrapper,
-      params?: any,
-      callback?: Callback<any>
-    ): Request;
-    list(params?: any, callback?: Callback<any>): Request;
-    fetch(
-      docnames: BulkFetchDocsWrapper,
-      params?: any,
-      callback?: Callback<any>
-    ): Request;
-    fetchRevs(
-      docnames: BulkFetchDocsWrapper,
-      params?: any,
-      callback?: Callback<any>
-    ): Request;
+    bulk(docs: BulkModifyDocsWrapper, callback?: Callback<any>): Request;
+    bulk(docs: BulkModifyDocsWrapper, params?: any, callback?: Callback<any>): Request;
+    list(callback?: Callback<any>): Request;
+    list(params: any, callback?: Callback<any>): Request;
+    fetch(docnames: BulkFetchDocsWrapper, callback?: Callback<any>): Request;
+    fetch(docnames: BulkFetchDocsWrapper, params: any, callback?: Callback<any>): Request;
+    fetchRevs(docnames: BulkFetchDocsWrapper, callback?: Callback<any>): Request;
+    fetchRevs(docnames: BulkFetchDocsWrapper, params?: any, callback?: Callback<any>): Request;
     multipart: Multipart;
     attachment: Attachment;
     show(
       designname: string,
       showname: string,
       doc_id: string,
-      params?: any,
+      callback?: Callback<any>
+    ): Request;
+    show(
+      designname: string,
+      showname: string,
+      doc_id: string,
+      params: any,
       callback?: Callback<any>
     ): Request;
     atomic(
       designname: string,
       updatename: string,
       docname: string,
-      body?: any,
+      callback?: Callback<any>
+    ): Request;
+    atomic(
+      designname: string,
+      updatename: string,
+      docname: string,
+      body: any,
       callback?: Callback<any>
     ): Request;
     updateWithHandler(
       designname: string,
       updatename: string,
       docname: string,
-      body?: any,
+      callback?: Callback<any>
+    ): Request;
+    updateWithHandler(
+      designname: string,
+      updatename: string,
+      docname: string,
+      body: any,
       callback?: Callback<any>
     ): Request;
     search(
       designname: string,
       searchname: string,
-      params?: any,
+      callback?: Callback<any>
+    ): Request;
+    search(
+      designname: string,
+      searchname: string,
+      params: any,
       callback?: Callback<any>
     ): Request;
     spatial(
       ddoc: string,
       viewname: string,
-      params?: any,
+      callback?: Callback<any>
+    ): Request;
+    spatial(
+      ddoc: string,
+      viewname: string,
+      params: any,
       callback?: Callback<any>
     ): Request;
     view(
       designname: string,
       viewname: string,
-      params?: any,
+      callback?: Callback<any>
+    ): Request;
+    view(
+      designname: string,
+      viewname: string,
+      params: any,
       callback?: Callback<any>
     ): Request;
     viewWithList(
       designname: string,
       viewname: string,
       listname: string,
-      params?: any,
+      callback?: Callback<any>
+    ): Request;
+    viewWithList(
+      designname: string,
+      viewname: string,
+      listname: string,
+      params: any,
       callback?: Callback<any>
     ): Request;
     server: ServerScope;
   }
 
   interface Multipart {
-    insert(
-      doc: any,
-      attachments: any[],
-      params: string | any,
-      callback?: Callback<any>
-    ): Request;
-    get(docname: string, params?: string | any, callback?: Callback<any>): Request;
+    insert(doc: any, attachments: any[], callback?: Callback<any>): Request;
+    insert(doc: any, attachments: any[], params: string | any, callback?: Callback<any>): Request;
+    get(docname: string, callback?: Callback<any>): Request;
+    get(docname: string, params: string | any, callback?: Callback<any>): Request;
   }
 
   interface Attachment {
+    insert(docname: string, attname: string, att: any, contenttype: string, callback?: Callback<any>): Request;
     insert(
       docname: string,
       attname: string,
       att: any,
       contenttype: string,
-      params?: any,
+      params: any,
       callback?: Callback<any>
     ): Request;
+    get(docname: string, attname: string, callback?: Callback<any>): Request;
     get(
       docname: string,
       attname: string,
-      params?: any,
+      params: any,
       callback?: Callback<any>
     ): Request;
+    destroy(docname: string, attname: string, callback?: Callback<any>): Request;
     destroy(
       docname: string,
       attname: string,
-      params?: any,
+      params: any,
       callback?: Callback<any>
     ): Request;
   }