Error: Vue3 项目暂不支持当前小程序

执行 `yarn dev:mp-toutiao` 或者 `yarn dev:mp-weixin`。

先是使用了正式版 `2.0.2-4040520250103001` 报错，后来升级到 alpha 版本 `2.0.2-alpha-4050320250224001` 仍然报错。

```json
{
  "name": "uniapp-demo",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "serve": "npm run dev:h5",
    "build": "npm run build:h5",
    "build:app-plus": "cross-env NODE_ENV=production UNI_PLATFORM=app-plus vue-cli-service uni-build",
    "build:custom": "cross-env NODE_ENV=production uniapp-cli custom",
    "build:h5": "cross-env NODE_ENV=production UNI_PLATFORM=h5 vue-cli-service uni-build",
    "build:mp-360": "cross-env NODE_ENV=production UNI_PLATFORM=mp-360 vue-cli-service uni-build",
    "build:mp-alipay": "cross-env NODE_ENV=production UNI_PLATFORM=mp-alipay vue-cli-service uni-build",
    "build:mp-baidu": "cross-env NODE_ENV=production UNI_PLATFORM=mp-baidu vue-cli-service uni-build",
    "build:mp-jd": "cross-env NODE_ENV=production UNI_PLATFORM=mp-jd vue-cli-service uni-build",
    "build:mp-kuaishou": "cross-env NODE_ENV=production UNI_PLATFORM=mp-kuaishou vue-cli-service uni-build",
    "build:mp-lark": "cross-env NODE_ENV=production UNI_PLATFORM=mp-lark vue-cli-service uni-build",
    "build:mp-qq": "cross-env NODE_ENV=production UNI_PLATFORM=mp-qq vue-cli-service uni-build",
    "build:mp-toutiao": "cross-env NODE_ENV=production UNI_PLATFORM=mp-toutiao vue-cli-service uni-build",
    "build:mp-weixin": "cross-env NODE_ENV=production UNI_PLATFORM=mp-weixin vue-cli-service uni-build",
    "build:mp-xhs": "cross-env NODE_ENV=production UNI_PLATFORM=mp-xhs vue-cli-service uni-build",
    "build:quickapp-native": "cross-env NODE_ENV=production UNI_PLATFORM=quickapp-native vue-cli-service uni-build",
    "build:quickapp-webview": "cross-env NODE_ENV=production UNI_PLATFORM=quickapp-webview vue-cli-service uni-build",
    "build:quickapp-webview-huawei": "cross-env NODE_ENV=production UNI_PLATFORM=quickapp-webview-huawei vue-cli-service uni-build",
    "build:quickapp-webview-union": "cross-env NODE_ENV=production UNI_PLATFORM=quickapp-webview-union vue-cli-service uni-build",
    "dev:app-plus": "cross-env NODE_ENV=development UNI_PLATFORM=app-plus vue-cli-service uni-build --watch",
    "dev:custom": "cross-env NODE_ENV=development uniapp-cli custom",
    "dev:h5": "cross-env NODE_ENV=development UNI_PLATFORM=h5 vue-cli-service uni-serve",
    "dev:mp-360": "cross-env NODE_ENV=development UNI_PLATFORM=mp-360 vue-cli-service uni-build --watch",
    "dev:mp-alipay": "cross-env NODE_ENV=development UNI_PLATFORM=mp-alipay vue-cli-service uni-build --watch",
    "dev:mp-baidu": "cross-env NODE_ENV=development UNI_PLATFORM=mp-baidu vue-cli-service uni-build --watch",
    "dev:mp-jd": "cross-env NODE_ENV=development UNI_PLATFORM=mp-jd vue-cli-service uni-build --watch",
    "dev:mp-kuaishou": "cross-env NODE_ENV=development UNI_PLATFORM=mp-kuaishou vue-cli-service uni-build --watch",
    "dev:mp-lark": "cross-env NODE_ENV=development UNI_PLATFORM=mp-lark vue-cli-service uni-build --watch",
    "dev:mp-qq": "cross-env NODE_ENV=development UNI_PLATFORM=mp-qq vue-cli-service uni-build --watch",
    "dev:mp-toutiao": "cross-env NODE_ENV=development UNI_PLATFORM=mp-toutiao vue-cli-service uni-build --watch",
    "dev:mp-weixin": "cross-env NODE_ENV=development UNI_PLATFORM=mp-weixin vue-cli-service uni-build --watch",
    "dev:mp-xhs": "cross-env NODE_ENV=development UNI_PLATFORM=mp-xhs vue-cli-service uni-build --watch",
    "dev:quickapp-native": "cross-env NODE_ENV=development UNI_PLATFORM=quickapp-native vue-cli-service uni-build --watch",
    "dev:quickapp-webview": "cross-env NODE_ENV=development UNI_PLATFORM=quickapp-webview vue-cli-service uni-build --watch",
    "dev:quickapp-webview-huawei": "cross-env NODE_ENV=development UNI_PLATFORM=quickapp-webview-huawei vue-cli-service uni-build --watch",
    "dev:quickapp-webview-union": "cross-env NODE_ENV=development UNI_PLATFORM=quickapp-webview-union vue-cli-service uni-build --watch",
    "info": "node node_modules/@dcloudio/vue-cli-plugin-uni/commands/info.js",
    "serve:quickapp-native": "node node_modules/@dcloudio/uni-quickapp-native/bin/serve.js",
    "test:android": "cross-env UNI_PLATFORM=app-plus UNI_OS_NAME=android jest -i",
    "test:h5": "cross-env UNI_PLATFORM=h5 jest -i",
    "test:ios": "cross-env UNI_PLATFORM=app-plus UNI_OS_NAME=ios jest -i",
    "test:mp-baidu": "cross-env UNI_PLATFORM=mp-baidu jest -i",
    "test:mp-weixin": "cross-env UNI_PLATFORM=mp-weixin jest -i"
  },
  "dependencies": {
    "@dcloudio/uni-app": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-app-plus": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-h5": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-i18n": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-mp-360": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-mp-alipay": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-mp-baidu": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-mp-jd": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-mp-kuaishou": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-mp-lark": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-mp-qq": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-mp-toutiao": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-mp-vue": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-mp-weixin": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-mp-xhs": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-quickapp-native": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-quickapp-webview": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-stacktracey": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-stat": "2.0.2-alpha-4050320250224001",
    "@vue/shared": "^3.0.0",
    "core-js": "^3.8.3",
    "flyio": "^0.6.2",
    "vue": ">= 2.6.14 < 2.7",
    "vuex": "^3.2.0"
  },
  "devDependencies": {
    "@dcloudio/types": "^3.3.2",
    "@dcloudio/uni-automator": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-cli-i18n": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-cli-shared": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-helper-json": "*",
    "@dcloudio/uni-migration": "2.0.2-alpha-4050320250224001",
    "@dcloudio/uni-template-compiler": "2.0.2-alpha-4050320250224001",
    "@dcloudio/vue-cli-plugin-hbuilderx": "2.0.2-alpha-4050320250224001",
    "@dcloudio/vue-cli-plugin-uni": "2.0.2-alpha-4050320250224001",
    "@dcloudio/vue-cli-plugin-uni-optimize": "2.0.2-alpha-4050320250224001",
    "@dcloudio/webpack-uni-mp-loader": "2.0.2-alpha-4050320250224001",
    "@dcloudio/webpack-uni-pages-loader": "2.0.2-alpha-4050320250224001",
    "@vue/cli-plugin-babel": "~5.0.0",
    "@vue/cli-service": "~5.0.0",
    "babel-plugin-import": "^1.11.0",
    "cross-env": "^7.0.2",
    "jest": "^25.4.0",
    "postcss-comment": "^2.0.0",
    "sass": "^1.49.8",
    "sass-loader": "^8.0.2",
    "vue-template-compiler": ">= 2.6.14 < 2.7"
  },
  "browserslist": [
    "Android >= 4.4",
    "ios >= 9"
  ],
  "uni-app": {
    "scripts": {}
  },
  "packageManager": "yarn@1.22.22+sha512.a6b2f7906b721bba3d67d4aff083df04dad64c399707841b7acf00f6b133b7ac24255f2652fa22ae3534329dc6180534e98d17432037ff6fd140556e2bb3137e"
}
```

related：https://github.com/dcloudio/uni-app/issues/5263

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Error: Vue3 项目暂不支持当前小程序 #108

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Error: Vue3 项目暂不支持当前小程序 #108

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