diff --git a/types/bidirectional-map/bidirectional-map-tests.ts b/types/bidirectional-map/bidirectional-map-tests.ts
new file mode 100644
index 0000000000..274680a1a7
--- /dev/null
+++ b/types/bidirectional-map/bidirectional-map-tests.ts
@@ -0,0 +1,19 @@
+import BiMap from "bidirectional-map";
+
+const bidirectionalMap = new BiMap({
+    one: 1
+});
+bidirectionalMap.size; // $ExpectType number
+bidirectionalMap.set("two", 2);
+bidirectionalMap.set("three", 3);
+bidirectionalMap.get("one"); // $ExpectType number
+bidirectionalMap.get(true); // $ExpectError
+bidirectionalMap.getKey(1); // $ExpectType string
+bidirectionalMap.getKey("one"); // $ExpectError
+bidirectionalMap.delete("two");
+bidirectionalMap.deleteValue(3);
+bidirectionalMap.entries(); // $ExpectType IterableIterator<[string, number]>
+bidirectionalMap.has("one"); // $ExpectType boolean
+bidirectionalMap.hasValue(2); // $ExpectType boolean
+bidirectionalMap.keys(); // $ExpectType IterableIterator<string>
+bidirectionalMap.values(); // $ExpectType IterableIterator<number>
diff --git a/types/bidirectional-map/index.d.ts b/types/bidirectional-map/index.d.ts
new file mode 100644
index 0000000000..67662d3441
--- /dev/null
+++ b/types/bidirectional-map/index.d.ts
@@ -0,0 +1,22 @@
+// Type definitions for bidirectional-map 1.0
+// Project: https://github.com/educastellano/bidirectional-map
+// Definitions by: Helen Anderson <https://github.com/helenanderson>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+export default class BiMap<TValue> {
+	constructor(object?: { [i: string]: TValue });
+	size: number;
+
+	set(key: string, value: TValue): void;
+	get(key: string): TValue;
+	getKey(value: TValue): string;
+	clear(): void;
+	delete(key: string): void;
+	deleteValue(value: TValue): void;
+	entries(): IterableIterator<[string, TValue]>;
+	has(key: string): boolean;
+	hasValue(value: TValue): boolean;
+	keys(): IterableIterator<string>;
+	values(): IterableIterator<TValue>;
+}
diff --git a/types/bidirectional-map/tsconfig.json b/types/bidirectional-map/tsconfig.json
new file mode 100644
index 0000000000..0c3b3a1cac
--- /dev/null
+++ b/types/bidirectional-map/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "bidirectional-map-tests.ts"
+    ]
+}
diff --git a/types/bidirectional-map/tslint.json b/types/bidirectional-map/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/bidirectional-map/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }