1 files changed, 43 insertions, 0 deletions
diff --git a/test/test-types-compilation.ts b/test/test-types-compilation.ts
new file mode 100644
index 0000000..00510da
--- /dev/null
+++ b/test/test-types-compilation.ts
@@ -0,0 +1,43 @@
+/* eslint-disable @typescript-eslint/ban-ts-comment, @typescript-eslint/no-unused-vars */
+
+import mitt from '..';
+
+const emitter = mitt();
+
+/*
+ * Check that if on is provided a generic, it only accepts handlers of that type
+ */
+{
+	const badHandler = (x: number) => {};
+	const goodHandler = (x: string) => {};
+
+	// @ts-expect-error
+	emitter.on<string>('foo', badHandler);
+	emitter.on<string>('foo', goodHandler);
+}
+
+/*
+ * Check that if off is provided a generic, it only accepts handlers of that type
+ */
+{
+	const badHandler = (x: number) => {};
+	const goodHandler = (x: string) => {};
+
+	// @ts-expect-error
+	emitter.off<string>('foo', badHandler);
+	emitter.off<string>('foo', goodHandler);
+}
+
+
+/*
+ * Check that if emitt is provided a generic, it only accepts event data of that type
+ */
+{
+	interface SomeEventData {
+    name: string;
+  }
+  // @ts-expect-error
+	emitter.emit<SomeEventData>('foo', 'NOT VALID');
+	emitter.emit<SomeEventData>('foo', { name: 'jack' });
+}
+