语法错误:意外的令牌"const"(与Vue，Karma，Webpack，PhantomJS一起使用) [英] SyntaxError: Unexpected token 'const' (with Vue, Karma, Webpack, PhantomJS)
问题描述
我有一个或多或少的Vanilla Laravel + Vue.js应用程序，我正在尝试做一些
I have a more-or-less vanilla Laravel + Vue.js app and I am trying to do some JS testing with Karma and Jasmine. If I try to use () => {} style functions or keywords like const in my tests, they fail with Unexpected token errors, however, I do not have a problem using the import keyword and I am able to transpile and work with .vue files without issue.
像这样的琐碎断言
expect(true).toBe(true);
似乎工作正常(请参见最后一行)
Seems to work fine (see last line)
$ ./node_modules/karma/bin/karma start
22 11 2016 11:09:23.250:INFO [karma]: Karma v1.3.0 server started at http://localhost:9876/
22 11 2016 11:09:23.254:INFO [launcher]: Launching browser PhantomJS with unlimited concurrency
22 11 2016 11:09:23.263:INFO [launcher]: Starting browser PhantomJS
22 11 2016 11:09:24.025:INFO [PhantomJS 2.1.1 (Mac OS X 0.0.0)]: Connected on socket /#U1dCZ7i3UtsC-M3_AAAA with id 84458811
PhantomJS 2.1.1 (Mac OS X 0.0.0): Executed 1 of 1 SUCCESS (0.004 secs / 0.002 secs)
然后，如果我在测试函数中添加了一个简单的const声明
Then, if I add a trivial const declaration to my test function
const myVar = 1
expect(true).toBe(true);
我得到一个错误:
$ ./node_modules/karma/bin/karma start
22 11 2016 11:10:00.741:INFO [karma]: Karma v1.3.0 server started at http://localhost:9876/
22 11 2016 11:10:00.745:INFO [launcher]: Launching browser PhantomJS with unlimited concurrency
22 11 2016 11:10:00.752:INFO [launcher]: Starting browser PhantomJS
22 11 2016 11:10:01.659:INFO [PhantomJS 2.1.1 (Mac OS X 0.0.0)]: Connected on socket /#Gwh8ywcLStrKf-ljAAAA with id 78654911
PhantomJS 2.1.1 (Mac OS X 0.0.0) ERROR
SyntaxError: Unexpected token 'const'
at tests/unit/Example.spec.js:165
相反，如果我尝试导致语法错误
Instead, if I try to cause a syntax error
const = 1 // syntax error
expect(true).toBe(true);
然后Babel抱怨(在第一行，在Karma或PhantomJS启动之前)
then Babel complains (on the first line, before Karma or PhantomJS boots up)
22 11 2016 11:07:00.079:ERROR [preprocessor.babel]: /Users/crcarter/Software/CropPlanning/cps-php/resources/assets/js/tests/unit/Example.spec.js: Unexpected token (8:15)
at /Users/crcarter/Software/CropPlanning/cps-php/resources/assets/js/tests/unit/Example.spec.js
22 11 2016 11:07:00.090:INFO [karma]: Karma v1.3.0 server started at http://localhost:9876/
22 11 2016 11:07:00.091:INFO [launcher]: Launching browser PhantomJS with unlimited concurrency
22 11 2016 11:07:00.101:INFO [launcher]: Starting browser PhantomJS
22 11 2016 11:07:00.986:INFO [PhantomJS 2.1.1 (Mac OS X 0.0.0)]: Connected on socket /#9Y6QLVxtJ57qRrgDAAAA with id 56249014
PhantomJS 2.1.1 (Mac OS X 0.0.0) ERROR
You need to include some adapter that implements __karma__.start method!
这似乎暗示Example.spec.js文件正在被Babel解析/翻译，但是即使Example.vue文件似乎已正确传递，该转译的版本也没有正确地传递到浏览器.
This seems to imply that the Example.spec.js file is being parsed/transpiled by Babel, but that the transpiled version is not being delivered to the browser properly, even though the Example.vue file seems to be delivered properly.
我该怎么做才能使const和() => {}之类的东西在我的测试中正常工作?谢谢.
What can I do to be able to get things like const and () => {} to work in my tests? Thank you.
以下是相关文件:
resources/assets/js/components/Example.vue
resources/assets/js/tests/unit/Example.spec.js
karma.conf.js
package.json
// Example.vue
<template>
<div class="container">
</div>
</template>
<script>
export default {
mounted() {
console.log('Component ready.')
},
data() {
return { input: '# Hello!' }
}
}
</script>
// Example.spec.js
import Example from '../../components/Example.vue';
describe('Example', function () {
it('should set correct default data', function () {
const myVar = 1
// trivial assertions
expect(true).toBe(true);
});
});
// karma.conf.js
var path = require('path')
var basePath = './resources/assets/js/';
module.exports = function(config) {
config.set({
frameworks: ['jasmine'],
port: 9876,
logLevel: config.LOG_INFO,
autoWatch: true,
browsers: ['PhantomJS'],
singleRun: true,
basePath: basePath,
webpack: {
resolve: {
extensions: ['', '.js', '.vue'],
fallback: [path.join(__dirname, 'node_modules')],
},
resolveLoader: {
fallback: [path.join(__dirname, 'node_modules')]
},
module: {
loaders: [
{ test: /\.vue$/, loader: 'vue' },
{ test: /\.js$/, loader: 'babel',
include: basePath,
}
]
}
},
webpackMiddleware: {
noInfo: true,
stats: 'errors-only'
},
files: [
{ pattern: 'tests/**/*.spec.js', watched: false },
],
exclude: [],
preprocessors: {
'app.js': ['webpack', 'babel'],
'tests/**/*.spec.js': [ 'babel', 'webpack' ]
},
})
}
和package.json
{
"private": true,
"scripts": {
"prod": "gulp --production",
"dev": "gulp watch"
},
"devDependencies": {
"bootstrap-sass": "^3.3.7",
"gulp": "^3.9.1",
"jquery": "^3.1.0",
"laravel-elixir": "^6.0.0-11",
"laravel-elixir-vue-2": "^0.2.0",
"laravel-elixir-webpack-official": "^1.0.2",
"lodash": "^4.16.2",
"vue": "^2.0.1",
"vue-resource": "^1.0.3"
},
"dependencies": {
"jasmine-core": "^2.5.2",
"karma": "^1.3.0",
"karma-babel-preprocessor": "^6.0.1",
"karma-chrome-launcher": "^2.0.0",
"karma-firefox-launcher": "^1.0.0",
"karma-jasmine": "^1.0.2",
"karma-phantomjs-launcher": "^1.0.2",
"karma-webpack": "^1.8.0"
}
}
推荐答案
@craig_h和@PanJunjie的评论使我走上了karma-babel-preprocessor的配置轨道，这使我进入了karma-webpack的配置.我仍然不确定是什么引起了原来的问题，但是看来我的Karma Webpack配置不正确或不完整，并且无提示地失败了.我通过添加babel-loader和babel-preset-es2015软件包
The comments by @craig_h and @PanJunjie set me on the track of looking at the configuration for karma-babel-preprocessor, which led me to the config for karma-webpack. I'm still not sure what was causing the original problem, but it appears that my webpack config for Karma was incorrect or incomplete, and was failing silently. I added babel-loader and babel-preset-es2015 packages via
yarn add babel-loader babel-preset-es2015
然后我像这样重新整理并清理karma.conf.js:
And then I redid and cleaned up my karma.conf.js as such:
module.exports = function(config) {
config.set({
singleRun: false, // false => watch for changes and rerun tests
autoWatch: true, // enable / disable watching files & then run tests
frameworks: ['jasmine'],
browsers: ['PhantomJS'],
// Options: LOG_DISABLE, LOG_ERROR, LOG_WARN, LOG_INFO, LOG_DEBUG
logLevel: config.LOG_INFO,
basePath: './resources/assets/js/',
files: [
{ pattern: 'tests/**/*.spec.js', watched: false },
],
// how to process files before serving them to the browser for testing
preprocessors: {
'app.js': ['webpack'],
'tests/**/*.spec.js': ['webpack'],
},
webpack: {
module: {
loaders: [
{ test: /\.vue$/, loader: 'vue' },
{ test: /\.js$/,
loader: 'babel-loader',
exclude: /node_modules/,
query: { presets: ['es2015'] }
}
]
},
// make sure to use the stand-alone version of Vue
resolve: {
alias: {vue: 'vue/dist/vue.js'}
}
},
webpackMiddleware: {
noInfo: true,
stats: 'errors-only'
}
});
};
我的package.json现在看起来像这样:
My package.json now looks like this:
{
"private": true,
"scripts": {
"prod": "gulp --production",
"dev": "gulp watch"
},
"devDependencies": {
"bootstrap-sass": "^3.3.7",
"gulp": "^3.9.1",
"jquery": "^3.1.0",
"laravel-elixir": "^6.0.0-11",
"laravel-elixir-vue-2": "^0.2.0",
"laravel-elixir-webpack-official": "^1.0.2",
"lodash": "^4.16.2",
"vue": "^2.0.1",
"vue-resource": "^1.0.3"
},
"dependencies": {
"babel-loader": "^6.2.8",
"babel-preset-es2015": "^6.18.0",
"jasmine-core": "^2.5.2",
"karma": "^1.3.0",
"karma-babel-preprocessor": "^6.0.1",
"karma-chrome-launcher": "^2.0.0",
"karma-firefox-launcher": "^1.0.0",
"karma-jasmine": "^1.0.2",
"karma-phantomjs-launcher": "^1.0.2",
"karma-webpack": "^1.8.0"
}
}
所有这些，我现在可以使用所有ES2015优点，例如const和() => {}.很抱歉回答我自己的问题，但我希望这对遇到类似问题的其他人有所帮助.
With all of that, I can now use all of the ES2015 goodness like const and () => {}. Sorry to answer my own question, but I hope this helps someone else that encounters a similar issue.
这篇关于语法错误:意外的令牌"const"(与Vue，Karma，Webpack，PhantomJS一起使用)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
