问题描述
为什么在manifest.json配置es6为false，编译出来的project.config.json里面的es6一直为true

复现步骤
manifest.json配置：

"mp-weixin": {
    "setting": {
      "urlCheck": false,
      "minified": true,
      "bigPackageSizeSupport": true,
      "es6": false
    },
  }

编译出来的project.config.json

"setting": {
   "urlCheck": false,
   "es6": true,
   "postcss": false,
   "minified": true,
   "newFeature": true,
   "bigPackageSizeSupport": true
 },

预期结果
预期编译出来的es6也是false

实际结果

系统信息:

• 发行平台: [如 微信小程序、H5平台、5+ App等] 微信小程序
• uni-app版本 [如使用Vue-cli创建/运行项目，则提供 npm run info 的运行结果]

Environment Info:

  System:
    OS: macOS 12.2.1
    CPU: (8) x64 Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz
  Binaries:
    Node: 14.16.0 - ~/.nvm/versions/node/v14.16.0/bin/node
    Yarn: 1.22.19 - ~/.nvm/versions/node/v14.16.0/bin/yarn
    npm: 6.14.11 - ~/.nvm/versions/node/v14.16.0/bin/npm
  Browsers:
    Chrome: 100.0.4896.88
    Firefox: 107.0.1
    Safari: 15.3
  npmPackages:
    @dcloudio/types: ^3.0.4 => 3.0.13 
    @dcloudio/uni-app-plus: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-app-plus-nvue:  0.0.1 
    @dcloudio/uni-app-plus-nvue-v8:  0.0.1 
    @dcloudio/uni-automator: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-cli-i18n: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-cli-shared: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-h5: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-helper-json: * => 1.0.13 
    @dcloudio/uni-i18n: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-migration: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-mp-360: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-mp-alipay: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-mp-baidu: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-mp-jd: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-mp-kuaishou: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-mp-lark: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-mp-qq: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-mp-toutiao: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-mp-vue: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-mp-weixin: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-mp-xhs: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-quickapp-native: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-quickapp-webview: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-stacktracey: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-stat: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/uni-template-compiler: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/vue-cli-plugin-hbuilderx: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/vue-cli-plugin-uni: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/vue-cli-plugin-uni-optimize: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/webpack-uni-mp-loader: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @dcloudio/webpack-uni-nvue-loader:  0.0.1 
    @dcloudio/webpack-uni-pages-loader: ^2.0.1-36220220914001 => 2.0.1-36320220917001 
    @hap-toolkit/dsl-vue:  0.6.13 
    @vue/babel-helper-vue-jsx-merge-props:  1.4.0 
    @vue/babel-helper-vue-transform-on:  1.0.2 
    @vue/babel-plugin-jsx:  1.1.1 
    @vue/babel-plugin-transform-vue-jsx:  1.4.0 
    @vue/babel-preset-app:  4.5.19 
    @vue/babel-preset-jsx:  1.4.0 
    @vue/babel-sugar-composition-api-inject-h:  1.4.0 
    @vue/babel-sugar-composition-api-render-instance:  1.4.0 
    @vue/babel-sugar-functional-vue:  1.4.0 
    @vue/babel-sugar-inject-h:  1.4.0 
    @vue/babel-sugar-v-model:  1.4.0 
    @vue/babel-sugar-v-on:  1.4.0 
    @vue/cli-overlay:  4.5.19 
    @vue/cli-plugin-babel: ~4.5.19 => 4.5.19 
    @vue/cli-plugin-router:  4.5.19 
    @vue/cli-plugin-vuex:  4.5.19 
    @vue/cli-service: ~4.5.19 => 4.5.19 
    @vue/cli-shared-utils:  4.5.19 
    @vue/compiler-sfc:  2.7.10 
    @vue/component-compiler-utils:  3.3.0 (3.3.0)
    @vue/devtools-api:  6.0.0-beta.15 
    @vue/preload-webpack-plugin:  1.1.2 
    @vue/shared: ^3.0.0 => 3.2.38 
    @vue/web-component-wrapper:  1.3.0 
    mp-demo:  1.0.0 
    mpvue-page-factory:  1.0.1 
    mpvue-template-compiler:  1.0.13 
    uni-h5-vue:  2.6.10 
    uni-mp-vue:  2.6.10 
    vue: ^2.6.11 => 2.7.10 
    vue-hot-reload-api:  2.3.4 
    vue-loader:  15.10.0 (16.8.3, 15.10.0)
    vue-router:  3.0.1 
    vue-style-loader:  4.1.3 (4.1.3)
    vue-template-compiler: ^2.6.11 => 2.7.10 (2.7.10)
    vue-template-es2015-compiler:  1.9.1 
    vue3:  1.0.0 
    vuex: ^3.2.0 => 3.6.2 (3.6.2)
  npmGlobalPackages:
    @vue/cli: 4.5.19