uni-preset-vue/template/default-ts/main.ts

import Vue from 'vue'
import App from './App.vue'

Vue.config.productionTip = false

function isPromise(obj: any) {
  return (
    !!obj &&
    (typeof obj === "object" || typeof obj === "function") &&
    typeof obj.then === "function"
  );
}

uni.addInterceptor({
  returnValue(res: any) {
    if (!isPromise(res)) {
      return res;
    }
    return new Promise((resolve, reject) => {
      res.then((res: [any, any]) => {
        if (res[0]) {
          reject(res[0]);
        } else {
          resolve(res[1]);
        }
      });
    });
  },
});

const app = new (typeof App === 'function' ? App : Vue.extend(Object.assign({ mpType: 'app' }, App)))
app.$mount();