feat: throw for excess keys in objects

.changeset/serious-crews-eat.md

@@ -0,0 +1,5 @@
+---
+'bodek': patch
+---
+
+Throw for excess keys in objects

src/__tests__/index.test.ts

@@ -94,6 +94,15 @@ describe('Bodek', () => {
 
 		// Assert - invalid.
 		expect(() => schema.parse({ foo: 'hello' })).toThrow('Missing key bar');
+
+		expect(() =>
+			schema.parse({
+				foo: 'hello',
+				bar: 123,
+				nested: { baz: 'world' },
+				extra: true,
+			}),
+		).toThrow('Unexpected excess key extra');
 	});
 
 	it('should infer types', () => {

src/schemas/object.ts

@@ -35,6 +35,12 @@ export class ObjectSchema<Shape extends ShapeSchema> extends Schema<
 			schema.parse(value[key as never]);
 		});
 
+		Object.keys(value).forEach((key) => {
+			if (!(key in this.shape)) {
+				throw new Error(`Unexpected excess key ${key}`);
+			}
+		});
+
 		return value as never;
 	}
 }