diff --git a/precond/precond-tests.ts b/precond/precond-tests.ts
new file mode 100644
index 0000000000..dc843e99f4
--- /dev/null
+++ b/precond/precond-tests.ts
@@ -0,0 +1,43 @@
+/// <reference path="./precond.d.ts" />
+
+import precond = require('precond');
+
+precond.checkArgument(true);
+precond.checkArgument(true, "msg");
+precond.checkArgument(true, "%s %s %s", 1, "two");
+
+precond.checkState(true);
+precond.checkState(true, "msg");
+precond.checkState(true, "%s %s %s", 1, "two");
+
+precond.checkIsDef(true);
+precond.checkIsDef(true, "msg");
+precond.checkIsDef(true, "%s %s %s", 1, "two");
+
+precond.checkIsDefAndNotNull(true);
+precond.checkIsDefAndNotNull(true, "msg");
+precond.checkIsDefAndNotNull(true, "%s %s %s", 1, "two");
+
+precond.checkIsString(true);
+precond.checkIsString(true, "msg");
+precond.checkIsString(true, "%s %s %s", 1, "two");
+
+precond.checkIsArray(true);
+precond.checkIsArray(true, "msg");
+precond.checkIsArray(true, "%s %s %s", 1, "two");
+
+precond.checkIsNumber(true);
+precond.checkIsNumber(true, "msg");
+precond.checkIsNumber(true, "%s %s %s", 1, "two");
+
+precond.checkIsBoolean(true);
+precond.checkIsBoolean(true, "msg");
+precond.checkIsBoolean(true, "%s %s %s", 1, "two");
+
+precond.checkIsFunction(true);
+precond.checkIsFunction(true, "msg");
+precond.checkIsFunction(true, "%s %s %s", 1, "two");
+
+precond.checkIsObject(true);
+precond.checkIsObject(true, "msg");
+precond.checkIsObject(true, "%s %s %s", 1, "two");
\ No newline at end of file
diff --git a/precond/precond-tests.ts.tscparams b/precond/precond-tests.ts.tscparams
new file mode 100644
index 0000000000..2988d8fd66
--- /dev/null
+++ b/precond/precond-tests.ts.tscparams
@@ -0,0 +1 @@
+--noImplicitAny --module commonjs
\ No newline at end of file
diff --git a/precond/precond.d.ts b/precond/precond.d.ts
new file mode 100644
index 0000000000..ef5362468a
--- /dev/null
+++ b/precond/precond.d.ts
@@ -0,0 +1,17 @@
+// Type definitions for precond 0.2.3
+// Project: https://github.com/MathieuTurcotte/node-precond
+// Definitions by: Oliver Schneider <https://github.com/olsio>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module "precond" {
+    export function checkArgument(value: any, message?: string, ...formatArgs: any[]): void;
+    export function checkState(value: any, message?: string, ...formatArgs: any[]): void;
+    export function checkIsDef(value: any, message?: string, ...formatArgs: any[]): any;
+    export function checkIsDefAndNotNull(value: any, message?: string, ...formatArgs: any[]): any;
+    export function checkIsString(value: any, message?: string, ...formatArgs: any[]): any;
+    export function checkIsArray(value: any, message?: string, ...formatArgs: any[]): any;
+    export function checkIsNumber(value: any, message?: string, ...formatArgs: any[]): any;
+    export function checkIsBoolean(value: any, message?: string, ...formatArgs: any[]): any;
+    export function checkIsFunction(value: any, message?: string, ...formatArgs: any[]): any;
+    export function checkIsObject(value: any, message?: string, ...formatArgs: any[]): any;
+}
\ No newline at end of file