diff --git a/istanbul/istanbul-tests.ts b/istanbul/istanbul-tests.ts
new file mode 100644
index 000000000..b283e2dcc
--- /dev/null
+++ b/istanbul/istanbul-tests.ts
@@ -0,0 +1,27 @@
+/// <reference path="istanbul.d.ts" />
+
+import * as istanbul from 'istanbul';
+
+// Instrument code
+var instrumenter = new istanbul.Instrumenter();
+
+var generatedCode = instrumenter.instrumentSync('function meaningOfLife() { return 42; }',
+    'filename.js');
+
+
+// Generate reports given a bunch of coverage JSON objects
+var collector = new istanbul.Collector(),
+    reporter = new istanbul.Reporter(),
+    sync = false;
+
+var obj1 = {},
+    obj2 = {};
+
+collector.add(obj1);
+collector.add(obj2); //etc.
+
+reporter.add('text');
+reporter.addAll([ 'lcov', 'clover' ]);
+reporter.write(collector, sync, function () {
+    console.log('All reports generated');
+});
diff --git a/istanbul/istanbul.d.ts b/istanbul/istanbul.d.ts
new file mode 100644
index 000000000..026ad8b00
--- /dev/null
+++ b/istanbul/istanbul.d.ts
@@ -0,0 +1,73 @@
+// Type definitions for Istanbul v0.4.0
+// Project: https://github.com/gotwarlost/istanbul
+// Definitions by: Tanguy Krotoff <https://github.com/tkrotoff>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'istanbul' {
+  namespace istanbul {
+    interface Istanbul {
+      new (options?: any): Istanbul;
+      Collector: Collector;
+      config: Config;
+      ContentWriter: ContentWriter;
+      FileWriter: FileWriter;
+      hook: Hook;
+      Instrumenter: Instrumenter;
+      Report: Report;
+      Reporter: Reporter;
+      Store: Store;
+      utils: ObjectUtils;
+      VERSION: string;
+      Writer: Writer;
+    }
+
+    interface Collector {
+      new (options?: any): Collector;
+      add(coverage: any, testName?: string): void;
+    }
+
+    interface Config {
+    }
+
+    interface ContentWriter {
+    }
+
+    interface FileWriter {
+    }
+
+    interface Hook {
+    }
+
+    interface Instrumenter {
+      new (options?: any): Instrumenter;
+      instrumentSync(code: string, filename: string): string;
+    }
+
+    interface Report {
+    }
+
+    interface Configuration {
+      new (obj: any, overrides: any): Configuration;
+    }
+
+    interface Reporter {
+      new (cfg?: Configuration, dir?: string): Reporter;
+      add(fmt: string): void;
+      addAll(fmts: Array<string>): void;
+      write(collector: Collector, sync: boolean, callback: Function): void;
+    }
+
+    interface Store {
+    }
+
+    interface ObjectUtils {
+    }
+
+    interface Writer {
+    }
+  }
+
+  var istanbul: istanbul.Istanbul;
+
+  export = istanbul;
+}