在webpack v4.x中

// webpack v4.x code
module: {
 rules: [
 {
 test: require.resolve('./src/index.js'),
 use: 'imports-loader?this=>window',
 }
 ]
}

可是在chainWebpack编写不生效

// use chainWebpack not working
chainWebpack: config => {
 config.module
 .rule('.js')
 .test(require.resolve('./src/libs/test.js'))
 .use('imports-loader')
 .loader('imports-loader?this=>window')
}