diff --git a/examples/napi/__test__/typegen.spec.ts.md b/examples/napi/__test__/typegen.spec.ts.md
index f2a985cc..54bd26ac 100644
--- a/examples/napi/__test__/typegen.spec.ts.md
+++ b/examples/napi/__test__/typegen.spec.ts.md
@@ -68,6 +68,8 @@ Generated by [AVA](https://avajs.dev).
     export function mutateExternal(external: ExternalObject<number>, newVal: number): void␊
     export function tsRename(a: { foo: number }): string[]␊
     export function xxh64Alias(input: Buffer): BigInt␊
+    export function getMapping(): Record<string, number>␊
+    export function sumMapping(nums: Record<string, number>): number␊
     export function mapOption(val?: number | undefined | null): number | undefined | null␊
     export function returnNull(): null␊
     export function returnUndefined(): void␊
diff --git a/examples/napi/__test__/typegen.spec.ts.snap b/examples/napi/__test__/typegen.spec.ts.snap
index 7132e138..2249df9d 100644
Binary files a/examples/napi/__test__/typegen.spec.ts.snap and b/examples/napi/__test__/typegen.spec.ts.snap differ
diff --git a/examples/napi/__test__/values.spec.ts b/examples/napi/__test__/values.spec.ts
index b080e2d5..a61b4d42 100644
--- a/examples/napi/__test__/values.spec.ts
+++ b/examples/napi/__test__/values.spec.ts
@@ -14,6 +14,8 @@ import {
   getNums,
   getWords,
   sumNums,
+  getMapping,
+  sumMapping,
   getCwd,
   Animal,
   Kind,
@@ -104,6 +106,11 @@ test('array', (t) => {
   t.is(sumNums([1, 2, 3, 4, 5]), 15)
 })
 
+test('map', (t) => {
+  t.deepEqual(getMapping(), { a: 101, b: 102 })
+  t.is(sumMapping({ a: 101, b: 102 }), 203)
+})
+
 test('enum', (t) => {
   t.deepEqual([Kind.Dog, Kind.Cat, Kind.Duck], [0, 1, 2])
   t.is(enumToI32(CustomNumEnum.Eight), 8)
diff --git a/examples/napi/index.d.ts b/examples/napi/index.d.ts
index da358ea6..6282cf8f 100644
--- a/examples/napi/index.d.ts
+++ b/examples/napi/index.d.ts
@@ -58,6 +58,8 @@ export function getExternal(external: ExternalObject<number>): number
 export function mutateExternal(external: ExternalObject<number>, newVal: number): void
 export function tsRename(a: { foo: number }): string[]
 export function xxh64Alias(input: Buffer): BigInt
+export function getMapping(): Record<string, number>
+export function sumMapping(nums: Record<string, number>): number
 export function mapOption(val?: number | undefined | null): number | undefined | null
 export function returnNull(): null
 export function returnUndefined(): void
diff --git a/examples/napi/src/lib.rs b/examples/napi/src/lib.rs
index 047c5add..5e0333b2 100644
--- a/examples/napi/src/lib.rs
+++ b/examples/napi/src/lib.rs
@@ -22,6 +22,7 @@ mod error;
 mod external;
 mod fn_ts_override;
 mod js_mod;
+mod map;
 mod nullable;
 mod number;
 mod object;
diff --git a/examples/napi/src/map.rs b/examples/napi/src/map.rs
new file mode 100644
index 00000000..c4d0bd43
--- /dev/null
+++ b/examples/napi/src/map.rs
@@ -0,0 +1,14 @@
+use std::collections::HashMap;
+
+#[napi]
+fn get_mapping() -> HashMap<String, u32> {
+  let mut map = HashMap::new();
+  map.insert("a".to_string(), 101);
+  map.insert("b".to_string(), 102);
+  map
+}
+
+#[napi]
+fn sum_mapping(nums: HashMap<String, u32>) -> u32 {
+  nums.into_values().sum()
+}