How can i update product variants? Please help me.

[Joy_Matubber]

I have developed a shopify app. The app feature is to update the product variables using product update metafiled 
My demo code is bellow :

export const action = async ({ request }) => {

  const { admin, session } = await authenticate.admin(request);

  const prodiuctData = Object.fromEntries(await request.formData());

  const product = await admin.rest.resources.Product.find({

    session: session,

    id: prodiuctData.productID,

  });

  product.variants = [

    {

      id: parseInt(prodiuctData.variantValue),

      inventory_quantity: parseInt(prodiuctData.variantValue),

    },

  ];

  await product.save({

    update: true,

  });

  console.log(product);

  return json(null);

};

Can anyone please help me.