I have 2 Vue-Cli webpack projects (ClientApp and Lib). Lib is my components library (shared with other projects)
Problem
When I build my project ClientApp npm run build
, I have the following error:
ERROR in static/js/app.d08a24ce0e8d0438ce68.js from UglifyJs
Unexpected token: operator (>) [C:/.../Lib/src/tools/escape-key.js:3,0][static/js/app.d08a24ce0e8d0438ce68.js:17468,38]
Questions
It seems like the error comes from an arrow function in the file escape-key.js
.
This is ES6 syntax and UglifyJS can't parse this.
Shouldn't Babel go first, before Uglify?
Note that is works well with *.vue
files.
Project structure
ClientApp
| - build
| - config
| - src
| - App.Vue // import EscapeKey from '~lib/tools/escape-key';
Lib
| -src
| - tools
| - escape-key.js
ClientApp's webpack.base.conf.js file
Note there is an alias to Lib.
resolve: {
extensions: ['.js', '.vue', '.json'],
alias: {
'@': resolve('src'),
'~lib': path.join(__dirname, '../../lib/src'),
}
},
Please feel free to ask for more details if required.
Add
"uglifyjs-webpack-plugin": "v1.0.0-beta.1",
to your dev dependencies and update your webpack.config.js
file to use this version explicitly:
const UglifyJSPlugin = require('uglifyjs-webpack-plugin')
module.exports = {
plugins: [
new UglifyJSPlugin()
]
}
uglifyjs-webpack-plugin latest stable release (v0.4.6) uses older version of uglify-js
instead of uglify-es
that is capable of transpiling ES6. This dependency was updated in 1.0.0-beta.1 release.
https://github.com/webpack-contrib/uglifyjs-webpack-plugin/releases/tag/v1.0.0-beta.1
This solved the problem for me.
I installed uglifyjs-webpack-plugin
npm install uglifyjs-webpack-plugin --save-dev
Then added this to my webpack.config
const UglifyJSPlugin = require('uglifyjs-webpack-plugin')
module.exports = {
plugins: [
new UglifyJSPlugin()
]
}
The version of uglify that you are using probably doesn't support ES6.
https://github.com/mishoo/UglifyJS2/tree/harmony is the es6 version as of now
if you want to use the webpack plugin, make sure to pay attention to the install section regarding es6
Important! The plugin has a peer dependency to uglify-js, so in order to use the plugin, also uglify-js has to be installed. The currently (2017/1/25) available uglify-js npm packages; however, do not support minification of ES6 code. In order to support ES6, an ES6-capable, a.k.a. harmony, version of UglifyJS has to be provided.
If your minification target is ES6:
yarn add git://github.com/mishoo/UglifyJS2#harmony-v2.8.22 --dev
After changing my babel-loader config, it worked.
Babel-loader config
{
test: /\.js$/,
loader: 'babel-loader',
include: [path.join(__dirname, '../../Lib/src'), resolve('src'), resolve('test')]
}
来源:https://stackoverflow.com/questions/43888474/unexpected-token-operator-from-uglifyjs