diff --git a/types/koa-send/index.d.ts b/types/koa-send/index.d.ts
index a15f5b688d..65228c9981 100644
--- a/types/koa-send/index.d.ts
+++ b/types/koa-send/index.d.ts
@@ -1,24 +1,46 @@
-// Type definitions for koa-send v3.3
+// Type definitions for koa-send 4.1
 // Project: https://github.com/koajs/send
 // Definitions by: Peter Safranek <https://github.com/pe8ter>
+//                 Tomek Łaziuk <https://github.com/tlaziuk>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
-import * as Koa from 'koa';
+import {
+    Context,
+} from "koa";
 
-interface ISendOptions {
-    root?: string;
-    index?: string;
-    maxAge?: number;
-    hidden?: boolean;
-    format?: boolean;
-    gzip?: boolean;
-    setHeaders?: Function;
-    extensions?: string[];
+import {
+    Stats,
+} from "fs";
+
+declare function send(ctx: Context, path: string, opts?: send.SendOptions): Promise<string>;
+
+declare namespace send {
+    type SetHeaders = (res: Context["res"], path: string, stats: Stats) => any;
+
+    interface SendOptions {
+        /** Browser cache max-age in milliseconds. (defaults to 0) */
+        maxage?: number;
+        maxAge?: SendOptions["maxage"];
+        /** Tell the browser the resource is immutable and can be cached indefinitely. (defaults to false) */
+        immutable?: boolean;
+        /** Allow transfer of hidden files. (defaults to false) */
+        hidden?: boolean;
+        /** Root directory to restrict file access. (defaults to '') */
+        root?: string;
+        /** Name of the index file to serve automatically when visiting the root location. (defaults to none) */
+        index?: string;
+        /** Try to serve the gzipped version of a file automatically when gzip is supported by a client and if the requested file with .gz extension exists. (defaults to true). */
+        gzip?: boolean;
+        /** Try to serve the brotli version of a file automatically when brotli is supported by a client and if the requested file with .br extension exists. (defaults to true). */
+        brotli?: boolean;
+        /** If not false (defaults to true), format the path to serve static file servers and not require a trailing slash for directories, so that you can do both /directory and /directory/. */
+        format?: boolean;
+        /** Function to set custom headers on response. */
+        setHeaders?: SetHeaders;
+        /** Try to match extensions from passed array to search for file when no extension is sufficed in URL. First found is served. (defaults to false) */
+        extensions?: string[] | false;
+    }
 }
 
-declare function send(ctx: Koa.Context, path: string, opts?: ISendOptions): Promise<string>;
-
-declare namespace send {}
-
 export = send;
diff --git a/types/koa-send/koa-send-tests.ts b/types/koa-send/koa-send-tests.ts
index 88a6f16abb..a3b136ea9a 100644
--- a/types/koa-send/koa-send-tests.ts
+++ b/types/koa-send/koa-send-tests.ts
@@ -1,4 +1,3 @@
-
 import * as Koa from 'koa';
 import * as send from 'koa-send';
 
@@ -16,7 +15,7 @@ app.use(async (ctx: Koa.Context) => {
         hidden: true,
         format: true,
         gzip: true,
-        setHeaders: () => {},
+        setHeaders: () => { },
         extensions: ['shemp'],
     });
 });
diff --git a/types/koa-send/tslint.json b/types/koa-send/tslint.json
index a41bf5d19a..f93cf8562a 100644
--- a/types/koa-send/tslint.json
+++ b/types/koa-send/tslint.json
@@ -1,79 +1,3 @@
 {
-    "extends": "dtslint/dt.json",
-    "rules": {
-        "adjacent-overload-signatures": false,
-        "array-type": false,
-        "arrow-return-shorthand": false,
-        "ban-types": false,
-        "callable-types": false,
-        "comment-format": false,
-        "dt-header": false,
-        "eofline": false,
-        "export-just-namespace": false,
-        "import-spacing": false,
-        "interface-name": false,
-        "interface-over-type-literal": false,
-        "jsdoc-format": false,
-        "max-line-length": false,
-        "member-access": false,
-        "new-parens": false,
-        "no-any-union": false,
-        "no-boolean-literal-compare": false,
-        "no-conditional-assignment": false,
-        "no-consecutive-blank-lines": false,
-        "no-construct": false,
-        "no-declare-current-package": false,
-        "no-duplicate-imports": false,
-        "no-duplicate-variable": false,
-        "no-empty-interface": false,
-        "no-for-in-array": false,
-        "no-inferrable-types": false,
-        "no-internal-module": false,
-        "no-irregular-whitespace": false,
-        "no-mergeable-namespace": false,
-        "no-misused-new": false,
-        "no-namespace": false,
-        "no-object-literal-type-assertion": false,
-        "no-padding": false,
-        "no-redundant-jsdoc": false,
-        "no-redundant-jsdoc-2": false,
-        "no-redundant-undefined": false,
-        "no-reference-import": false,
-        "no-relative-import-in-test": false,
-        "no-self-import": false,
-        "no-single-declare-module": false,
-        "no-string-throw": false,
-        "no-unnecessary-callback-wrapper": false,
-        "no-unnecessary-class": false,
-        "no-unnecessary-generics": false,
-        "no-unnecessary-qualifier": false,
-        "no-unnecessary-type-assertion": false,
-        "no-useless-files": false,
-        "no-var-keyword": false,
-        "no-var-requires": false,
-        "no-void-expression": false,
-        "no-trailing-whitespace": false,
-        "object-literal-key-quotes": false,
-        "object-literal-shorthand": false,
-        "one-line": false,
-        "one-variable-per-declaration": false,
-        "only-arrow-functions": false,
-        "prefer-conditional-expression": false,
-        "prefer-const": false,
-        "prefer-declare-function": false,
-        "prefer-for-of": false,
-        "prefer-method-signature": false,
-        "prefer-template": false,
-        "radix": false,
-        "semicolon": false,
-        "space-before-function-paren": false,
-        "space-within-parens": false,
-        "strict-export-declare-modifiers": false,
-        "trim-file": false,
-        "triple-equals": false,
-        "typedef-whitespace": false,
-        "unified-signatures": false,
-        "void-return": false,
-        "whitespace": false
-    }
+    "extends": "dtslint/dt.json"
 }