Js compress by uglify-js give error Unexpected token: name ($)

问题

I am compress my js files by uglify-js I want to compress Bootstrap 4 js file but it give me Error like this. Can I compress all js files by only uglify-js Or how can i do it.

    Parse error at src\bootstrap\alert.js:1,7
    import $ from 'jquery'
           ^
    ERROR: Unexpected token: name ($)

my package.json

"devDependencies": {
    "node-sass": "^4.6.1",
    "nodemon": "^1.12.1"
  },
  "dependencies": {
    "autoprefixer": "^7.1.6",
    "jquery": "^3.2.1",
    "postcss-cli": "^4.1.1",
    "uglify-js": "^3.1.9"
  }

回答1:

Try using the ES6 version of uglify-js. Replace with this in your package.json

"uglify-js": "git+https://github.com/mishoo/UglifyJS2.git#harmony"

or via command line:

npm install --save uglify-js@github:mishoo/UglifyJS2#harmony

回答2:

uglify-js does not support ES2015 syntax like import statements or arrow functions. Instead, use the uglify-es module:

-    "uglify-js": "^3.1.9"
+    "uglify-es": "^3.1.9"

来源：https://stackoverflow.com/questions/47286311/js-compress-by-uglify-js-give-error-unexpected-token-name