npm build (nuxt build) does not create dist folder in amplify(aws codebuild) using nuxt spa mode

问题

I want to create dist folder, after running 'npm build'(nuxt build) in amplify.

I run npm build in my local(mac) , then dist folder is created.

I run 'ls -a' after 'npm build' , then dist folder does not exist in amplify.

                                 > nuxt build
2019-08-20T01:49:08.598Z [INFO]: # Executing command: ls -a
2019-08-20T01:49:08.602Z [INFO]: .
                                 ..
                                 amplify.sh
                                 amplify.yml
                                 assets
                                 components
                                 .editorconfig
                                 .eslintrc.js
                                 .git
                                 .gitignore
                                 layouts
                                 middleware
                                 node_modules
                                 .nuxt
                                 nuxt.config.js
                                 package.json
                                 package-lock.json
                                 pages
                                 plugins
                                 .prettierrc
                                 README.md
                                 static
                                 store
                                 .vscode
                                 yarn.lock
                                 # Completed phase: build

here is package.json

    {
        ...
        "scripts": {
        "dev": "nuxt",
        "build": "nuxt build",
        "start": "nuxt start",
        "generate": "nuxt generate",
        "lint": "eslint --ext .js,.vue --ignore-path .gitignore .",
        "precommit": "npm run lint"
      },

here is amplify.yml

version: 0.1
frontend:
  phases:
    preBuild:
      commands:
        - npm install
    build:
      commands:
        - npm run build 
        - ls -a
  artifacts:
    # IMPORTANT - Please verify your build output directory
    baseDirectory:
        dist
    files:
      - '**/*'
  cache:
    paths:
      - node_modules/**/*

I am waitng for your answer , thanks.

来源：https://stackoverflow.com/questions/57565766/npm-build-nuxt-build-does-not-create-dist-folder-in-amplifyaws-codebuild-usi