diff --git a/types/iferr/iferr-tests.ts b/types/iferr/iferr-tests.ts
new file mode 100644
index 0000000000..f7377358cf
--- /dev/null
+++ b/types/iferr/iferr-tests.ts
@@ -0,0 +1,38 @@
+/// <reference types="node" />
+
+import * as fs from "fs";
+import iferr = require("iferr");
+
+const { tiferr, throwerr, printerr } = iferr;
+
+const { readFile } = fs;
+
+const errcb = (err: Error | undefined) => { throw err; };
+
+readFile("test.txt", iferr(errcb, result => {
+    Buffer.from("test", "utf8") === result;
+}));
+
+readFile("test.txt", "utf8", iferr(errcb, result => {
+    "test" === result;
+}));
+
+readFile("test.txt", tiferr(errcb, result => {
+    Buffer.from("test", "utf8") === result;
+}));
+
+readFile("test.txt", "utf8", tiferr(errcb, result => {
+    "test" === result;
+}));
+
+readFile("test.txt", throwerr(result => {
+    Buffer.from("test", "utf8") === result;
+}));
+
+readFile("test.txt", "utf8", throwerr(result => {
+    "test" === result;
+}));
+
+readFile("test.txt", printerr);
+
+readFile("test.txt", "utf8", printerr);
diff --git a/types/iferr/index.d.ts b/types/iferr/index.d.ts
new file mode 100644
index 0000000000..c65c270b49
--- /dev/null
+++ b/types/iferr/index.d.ts
@@ -0,0 +1,29 @@
+// Type definitions for iferr 1.0
+// Project: https://github.com/shesek/iferr
+// Definitions by: segayuu <https://github.com/segayuu>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+type nodeCallback<T> = (err: Error | undefined, ...a: T[]) => any;
+
+// Delegates to `succ` on sucecss or to `fail` on error
+// ex: Thing.load(123, iferr(cb, thing => ...))
+declare function iferr<T>(fail: (err: Error | undefined) => void, succ: (...result: T[]) => void): nodeCallback<T>;
+
+declare namespace iferr {
+    // Delegates to `succ` on sucecss or to `fail` on error
+    // ex: Thing.load(123, iferr(cb, thing => ...))
+    function iferr<T>(fail: (err: Error | undefined) => void, succ: (...result: T[]) => void): nodeCallback<T>;
+
+    // Like iferr, but also catches errors thrown from `succ` and passes to `fail`
+    function tiferr<T>(fail: (err: Error | undefined) => void, succ: (...result: T[]) => void): nodeCallback<T>;
+
+    // Delegate to the success function on success, throws the error otherwise
+    // ex: Thing.load(123, throwerr(thing => ...))
+    function throwerr<T>(succ: (...result: T[]) => void): nodeCallback<T>;
+
+    // Prints errors when one is passed, or does nothing otherwise
+    // ex: Thing.load(123, printerr)
+    function printerr(): nodeCallback<any>;
+}
+
+export = iferr;
diff --git a/types/iferr/tsconfig.json b/types/iferr/tsconfig.json
new file mode 100644
index 0000000000..db97bdf495
--- /dev/null
+++ b/types/iferr/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "strictFunctionTypes": true
+    },
+    "files": [
+        "index.d.ts",
+        "iferr-tests.ts"
+    ]
+}
diff --git a/types/iferr/tslint.json b/types/iferr/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/iferr/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }