diff --git a/types/eventsource/eventsource-tests.ts b/types/eventsource/eventsource-tests.ts
new file mode 100644
index 0000000000..b476e112a8
--- /dev/null
+++ b/types/eventsource/eventsource-tests.ts
@@ -0,0 +1,15 @@
+import * as EventSource from "eventsource";
+
+const eventSource = new EventSource("http://foobar");
+eventSource.onmessage = (x: any) => {};
+eventSource.onerror = (x: any) => {};
+eventSource.onopen = (x: any) => {};
+eventSource.close();
+
+import * as EventSourcePolyfill from "eventsource/lib/eventsource-polyfill";
+
+const eventSourcePolyfill = new EventSourcePolyfill("http://foobar");
+eventSourcePolyfill.onmessage = (x: any) => {};
+eventSourcePolyfill.onerror = (x: any) => {};
+eventSourcePolyfill.onopen = (x: any) => {};
+eventSourcePolyfill.close();
diff --git a/types/eventsource/index.d.ts b/types/eventsource/index.d.ts
new file mode 100644
index 0000000000..3620b6116f
--- /dev/null
+++ b/types/eventsource/index.d.ts
@@ -0,0 +1,35 @@
+// Type definitions for eventsource 1.0
+// Project: http://github.com/EventSource/eventsource
+// Definitions by: Scott Lee Davis <https://github.com/scottleedavis>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+declare class EventSource {
+  constructor(url: string, eventSourceInitDict?: EventSource.EventSourceInitDict);
+
+  static CLOSED: EventSource.ReadyState;
+  static CONNECTING: EventSource.ReadyState;
+  static OPEN: EventSource.ReadyState;
+
+  url: string;
+  readyState: EventSource.ReadyState;
+  onopen: EventListener;
+  onmessage: EventListener;
+  onerror: EventListener;
+  close(): void;
+}
+
+declare namespace EventSource {
+  enum ReadyState {CONNECTING = 0, OPEN = 1, CLOSED = 2}
+
+  interface EventSourceInitDict {
+    withCredentials?: boolean;
+    headers?: object;
+    proxy?: string;
+    https?: object;
+    rejectUnauthorized?: boolean;
+  }
+}
+
+export = EventSource;
+export as namespace EventSource;
diff --git a/types/eventsource/lib/eventsource-polyfill/index.d.ts b/types/eventsource/lib/eventsource-polyfill/index.d.ts
new file mode 100644
index 0000000000..6246355dfe
--- /dev/null
+++ b/types/eventsource/lib/eventsource-polyfill/index.d.ts
@@ -0,0 +1,29 @@
+declare class EventSource {
+  constructor(url: string, eventSourceInitDict?: EventSource.EventSourceInitDict);
+
+  static CLOSED: EventSource.ReadyState;
+  static CONNECTING: EventSource.ReadyState;
+  static OPEN: EventSource.ReadyState;
+
+  url: string;
+  readyState: EventSource.ReadyState;
+  onopen: EventListener;
+  onmessage: EventListener;
+  onerror: EventListener;
+  close(): void;
+}
+
+declare namespace EventSource {
+  enum ReadyState {CONNECTING = 0, OPEN = 1, CLOSED = 2}
+
+  interface EventSourceInitDict {
+    withCredentials?: boolean;
+    headers?: object;
+    proxy?: string;
+    https?: object;
+    rejectUnauthorized?: boolean;
+  }
+}
+
+export = EventSource;
+export as namespace EventSource;
diff --git a/types/eventsource/tsconfig.json b/types/eventsource/tsconfig.json
new file mode 100644
index 0000000000..440f5427c3
--- /dev/null
+++ b/types/eventsource/tsconfig.json
@@ -0,0 +1,25 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": false,
+        "strictNullChecks": false,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "eventsource-tests.ts",
+        "lib/eventsource-polyfill/index.d.ts"
+    ]
+}
diff --git a/types/eventsource/tslint.json b/types/eventsource/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/eventsource/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }