fix: handle onrejected for thenable

Author: sxzz

src/index.ts

@@ -59,7 +59,7 @@ function fromObject<Return, Args extends any[]>(
   }
   const fn = (...args: Args): any => {
     const iter = generator(...args) as unknown as QuansyncGenerator<Return, Args> & Promise<Return>
-    iter.then = fn => options.async(...args).then(fn)
+    iter.then = (...thenArgs) => options.async(...args).then(...thenArgs)
     return iter
   }
   fn.sync = options.sync

test/index.test.ts

@@ -125,3 +125,19 @@ it('yield promise', async () => {
     .toThrowErrorMatchingInlineSnapshot(`[Error: [Quansync] Yielded an unexpected promise in sync context]`)
   await expect(run.async('foo')).resolves.toBe('foo')
 })
+
+it('handle errors', async () => {
+  const throwError = quansync({
+    name: 'throwError',
+    sync: () => {
+      throw new Error('sync error')
+    },
+    async: async () => {
+      throw new Error('async error')
+    },
+  })
+
+  await expect(async () => await throwError()).rejects.toThrowErrorMatchingInlineSnapshot(`[Error: async error]`)
+  await expect(throwError.async()).rejects.toThrowErrorMatchingInlineSnapshot(`[Error: async error]`)
+  expect(() => throwError.sync()).toThrowErrorMatchingInlineSnapshot(`[Error: sync error]`)
+})