WIP

src/native/index.ts

@@ -1,7 +1,15 @@
 import path from 'path';
 import nodeGypBuild from 'node-gyp-build';
 
+interface Native {
+  addOne(n: number): number;
+  timesTwo(n: number): number;
+  createArr(): [number];
+  createObj(): { key: string };
+  setProperty(obj: { key1: string }): { key1: string; key2: string };
+}
+
 // Path to project root containing package.json and binding.gyp
-const native = nodeGypBuild(path.join(__dirname, '../../'));
+const native: Native = nodeGypBuild(path.join(__dirname, '../../'));
 
 export default native;

tests/lib/native.test.ts

@@ -24,8 +24,9 @@ describe('native bindings', () => {
     // expect(native.createObj()).toStrictEqual({ key: 'hello world' });
   });
   test('set property', () => {
-    expect(
-      native.setProperty({ key1: 'value1' })
-    ).toStrictEqual({ key1: 'value1', key2: 'initial value1'});
+    expect(native.setProperty({ key1: 'value1' })).toStrictEqual({
+      key1: 'value1',
+      key2: 'initial value1',
+    });
   });
 });