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如何将 js 同步方法转换成异步方法

// promise
export const getUserToken = () => new Promise((resolve, reject) => {
  setupWebViewJavascriptBridge((bridge) => {
    bridge.callHandler('fetchUserInfo', (data) => {
      resolve(data)
    })
  })
})

const getUserToken = () => Promise.resolve(data);

// async await
async function(){
    const data = await getUserToken()
    console.log(data )
}

// callback
const getUserToken = (cb) => {
  setupWebViewJavascriptBridge((bridge) => {
    bridge.callHandler('fetchUserInfo', (data) => {
      cb && cb(data)
    });
  });
};
 
getUserToken(fucntion(data){
    console.log(data);
}

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