我有一个 mocha 测试文件 (test/test.js
),它是这样开始的,使用 ES6 模块语法:
import {promises as fs} from 'fs'
import stepToD3 from '../src/StepToD3'
import assert from "assert"
此外,我在项目的根目录中有一个 babel.config.js
文件:
module.exports = {
presets: [
"@vue/app",
"@babel/preset-env"
]
}
然后我想使用通过 babel 转译的 Mocha 来测试它。我这样做是使用 mocha --require @babel/register test/test.js
。但是,在执行期间的某处,此操作失败并出现以下错误:
/home/michael/Programming/cola-step/node_modules/@babel/runtime-corejs2/helpers/esm/asyncToGenerator.js:1
(function (exports, require, module, __filename, __dirname) { import _Promise from "../../core-js/promise";
^^^^^^^^
SyntaxError: Unexpected identifier
at new Script (vm.js:84:7)
at createScript (vm.js:264:10)
at Object.runInThisContext (vm.js:312:10)
at Module._compile (internal/modules/cjs/loader.js:684:28)
at Module._compile (/home/michael/Programming/cola-step/node_modules/pirates/lib/index.js:83:24)
at Module._extensions..js (internal/modules/cjs/loader.js:732:10)
at Object.newLoader [as .js] (/home/michael/Programming/cola-step/node_modules/pirates/lib/index.js:88:7)
at Module.load (internal/modules/cjs/loader.js:620:32)
at tryModuleLoad (internal/modules/cjs/loader.js:560:12)
at Function.Module._load (internal/modules/cjs/loader.js:552:3)
at Module.require (internal/modules/cjs/loader.js:657:17)
at require (internal/modules/cjs/helpers.js:22:18)
at Object.<anonymous> (/home/michael/Programming/cola-step/test/test.js:7:49)
at Module._compile (internal/modules/cjs/loader.js:721:30)
at Module._compile (/home/michael/Programming/cola-step/node_modules/pirates/lib/index.js:83:24)
at Module._extensions..js (internal/modules/cjs/loader.js:732:10)
at Object.newLoader [as .js] (/home/michael/Programming/cola-step/node_modules/pirates/lib/index.js:88:7)
at Module.load (internal/modules/cjs/loader.js:620:32)
at tryModuleLoad (internal/modules/cjs/loader.js:560:12)
at Function.Module._load (internal/modules/cjs/loader.js:552:3)
at Module.require (internal/modules/cjs/loader.js:657:17)
at require (internal/modules/cjs/helpers.js:22:18)
at /usr/lib/node_modules/mocha/lib/mocha.js:231:27
at Array.forEach (<anonymous>)
at Mocha.loadFiles (/usr/lib/node_modules/mocha/lib/mocha.js:228:14)
at Mocha.run (/usr/lib/node_modules/mocha/lib/mocha.js:536:10)
at Object.<anonymous> (/usr/lib/node_modules/mocha/bin/_mocha:573:18)
at Module._compile (internal/modules/cjs/loader.js:721:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:732:10)
at Module.load (internal/modules/cjs/loader.js:620:32)
at tryModuleLoad (internal/modules/cjs/loader.js:560:12)
at Function.Module._load (internal/modules/cjs/loader.js:552:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:774:12)
at executeUserCode (internal/bootstrap/node.js:342:17)
at startExecution (internal/bootstrap/node.js:276:5)
at startup (internal/bootstrap/node.js:227:5)
at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)
如果我使用的是 Babel,为什么无法理解 ES6 导入语法?这里出了什么问题?
最佳答案
在这种情况下,我在 NodeJS 上使用 mocha 运行我的测试,但我的 babel.config.js
被设置为为浏览器生成代码。为了解决这个问题,我必须创建两个不同的 babel 设置,然后在运行适当的命令之前导出正确的 NODE_ENV
值(例如 NODE_ENV=test mocha --require @babel/register
用于测试,NODE_ENV=production
用于我的 webpack 生产构建)。
这是我的新 babel.config.js
:
module.exports = {
'env': {
'production': {
'presets': [
[
'@vue/app',
{
// "modules": false,
'targets': ['ie >= 9']
},
'@babel/env'
]
],
'comments': false
},
'test': {
'presets': [
[
'@babel/env',
{'targets': {'node': 'current'}}
]
]
}
}
}
关于javascript - 语法错误 : Unexpected identifier with mocha and babel,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54176323/