warning ..\package.json: No license field

在初始化Vue項目的的時候發現警告

yarn install

查了下發現是，package.json 文件中缺少license參數

{
  "name": "movie_view",
  "version": "0.1.0",
  "license": "MIT",
  "private": true,
  "scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
  },
  "dependencies": {
    "core-js": "^3.3.2",
    "vue": "^2.6.10"
  },
  "devDependencies": {
    "@vue/cli-plugin-babel": "^4.0.0",
    "@vue/cli-plugin-eslint": "^4.0.0",
    "@vue/cli-service": "^4.0.0",
    "babel-eslint": "^10.0.3",
    "eslint": "^5.16.0",
    "eslint-plugin-vue": "^5.0.0",
    "vue-template-compiler": "^2.6.10"
  },
  "eslintConfig": {
    "root": true,
    "env": {
      "node": true
    },
    "extends": [
      "plugin:vue/essential",
      "eslint:recommended"
    ],
    "rules": {},
    "parserOptions": {
      "parser": "babel-eslint"
    }
  },
  "postcss": {
    "plugins": {
      "autoprefixer": {}
    }
  },
  "browserslist": [
    "> 1%",
    "last 2 versions"
  ]
}

添加license，默認是 [MIT],項目許可證，讓使用者知道是如何被允許使用此項目。

這是查到的一種解釋。

但我添加後，使用 yarn build 仍然一直報這個警告，但用 npm run build 這個警告就沒有了。不知道原因，如果哪位大神知道，請告知，謝謝。