diff --git a/assert-plus/assert-plus-tests.ts b/assert-plus/assert-plus-tests.ts
new file mode 100644
index 0000000000..9042bbbb69
--- /dev/null
+++ b/assert-plus/assert-plus-tests.ts
@@ -0,0 +1,5 @@
+import * as lib from 'assert-plus';
+
+let arr = ['one', 'two'];
+
+lib.array(arr, '');
diff --git a/assert-plus/index.d.ts b/assert-plus/index.d.ts
new file mode 100644
index 0000000000..2bdcae3250
--- /dev/null
+++ b/assert-plus/index.d.ts
@@ -0,0 +1,67 @@
+// Type definitions for assert-plus 1.0
+// Project: https://github.com/mcavage/node-assert-plus#readme
+// Definitions by: Костя Третяк <https://github.com/KostyaTretyak>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export function array(options: any[], message ?: string): void;
+export function bool(options: boolean, message ?: string): void;
+export function buffer(options: any, message ?: string): void;
+export function func(options: any, message ?: string): void;
+export function number(options: number, message ?: string): void;
+export function finite(options: any, message ?: string): void;
+export function object(options: any, message ?: string): void;
+export function string(options: string, message ?: string): void;
+export function stream(options: any, message ?: string): void;
+export function date(options: string | number, message ?: string): void;
+export function regexp(options: any, message ?: string): void;
+export function uuid(options: string, message ?: string): void;
+export function arrayOfArray(options: any[], message ?: string): void;
+export function arrayOfBool(options: boolean[], message ?: string): void;
+export function arrayOfBuffer(options: any[], message ?: string): void;
+export function arrayOfFunc(options: any[], message ?: string): void;
+export function arrayOfNumber(options: number[], message ?: string): void;
+export function arrayOfFinite(options: any[], message ?: string): void;
+export function arrayOfObject(options: any[], message ?: string): void;
+export function arrayOfString(options: string[], message ?: string): void;
+export function arrayOfStream(options: any[], message ?: string): void;
+export function arrayOfDate(options: Array<string | number>, message ?: string): void;
+export function arrayOfRegexp(options: any[], message ?: string): void;
+export function arrayOfUuid(options: string[], message ?: string): void;
+export function optionalArray(options: any, message ?: string): void;
+export function optionalBool(options: any, message ?: string): void;
+export function optionalBuffer(options: any, message ?: string): void;
+export function optionalFunc(options: any, message ?: string): void;
+export function optionalNumber(options: any, message ?: string): void;
+export function optionalFinite(options: any, message ?: string): void;
+export function optionalObject(options: any, message ?: string): void;
+export function optionalString(options: any, message ?: string): void;
+export function optionalStream(options: any, message ?: string): void;
+export function optionalDate(options: any, message ?: string): void;
+export function optionalRegexp(options: any, message ?: string): void;
+export function optionalUuid(options: any, message ?: string): void;
+export function optionalArrayOfArray(options: any, message ?: string): void;
+export function optionalArrayOfBool(options: any, message ?: string): void;
+export function optionalArrayOfBuffer(options: any, message ?: string): void;
+export function optionalArrayOfFunc(options: any, message ?: string): void;
+export function optionalArrayOfNumber(options: any, message ?: string): void;
+export function optionalArrayOfFinite(options: any, message ?: string): void;
+export function optionalArrayOfObject(options: any, message ?: string): void;
+export function optionalArrayOfString(options: any, message ?: string): void;
+export function optionalArrayOfStream(options: any, message ?: string): void;
+export function optionalArrayOfDate(options: any, message ?: string): void;
+export function optionalArrayOfRegexp(options: any, message ?: string): void;
+export function optionalArrayOfUuid(options: any, message ?: string): void;
+export function AssertionError(options: any, message ?: string): void;
+export function fail(actual: any, expected: any, message: any, operator: any): void;
+export function ok(options: any, message ?: string): void;
+export function equal(actual: any, expected: any, message ?: string): void;
+export function notEqual(actual: any, expected: any, message ?: string): void;
+export function deepEqual(actual: any, expected: any, message ?: string): void;
+export function notDeepEqual(actual: any, expected: any, message ?: string): void;
+export function strictEqual(actual: any, expected: any, message ?: string): void;
+export function notStrictEqual(actual: any, expected: any, message ?: string): void;
+export function throws(block: any, error ?: any, message ?: string): void;
+export function doesNotThrow(block: any, error ?: any, message ?: string): void;
+export function ifError(value: any): void;
+
+export as namespace AssertPlus;
diff --git a/assert-plus/tsconfig.json b/assert-plus/tsconfig.json
new file mode 100644
index 0000000000..22fa7db7b9
--- /dev/null
+++ b/assert-plus/tsconfig.json
@@ -0,0 +1,20 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "assert-plus-tests.ts"
+    ]
+}
diff --git a/assert-plus/tslint.json b/assert-plus/tslint.json
new file mode 100644
index 0000000000..377cc837d4
--- /dev/null
+++ b/assert-plus/tslint.json
@@ -0,0 +1 @@
+{ "extends": "../tslint.json" }