How to hide links in Sanity Studio when editor has not given a value

export default {
  name: "project",
  title: "Project",
  type: "document",
  fields: [
    {
      name: "title",
      type: "string",
    },
    {
      name: "subtitle",
      type: "string",
    },
    {
      name: "mainImage",
      title: "Main image",
      type: "image",
      options: {
        hotspot: true,
      },
    },
    {
      name: "date",
      type: "datetime",
    },
    {
      name: "place",
      type: "string",
    },
    {
      name: "description",
      type: "text",
    },
    {
      name: "projectType",
      title: "Project type",
      type: "string",
      options: {
        list: [
          { value: "personal", title: "Personal" },
          { value: "client", title: "Client" },
          { value: "school", title: "School" },
        ],
      },
    },
    {
      name: "link",
      title: "Link",
      type: "url",
    },
    {
      name: "ghlink",
      title: "GitHub Link",
      type: "url",
    },
  ],
};

{
      name: "link",
      title: "Link",
      type: "url",
    },
    {
      name: "ghlink",
      title: "GitHub Link",
      type: "url",
    },
  ],
};

{
  name: "link",
  title: "Link",
  type: "url",
  hidden: ({ value }) => !value,
},
{
  name: "ghlink",
  title: "GitHub Link",
  type: "url",
  hidden: ({ value }) => !value,
},