在使用Mocha和Babel进行测试时处理WebPack CSS导入 [英] Handle WebPack CSS imports when testing with Mocha and Babel
问题描述
当测试 .js
有Webpack CSS导入的文件,如 import'./style.css'
,Mocha抛出语法错误(因为它试图导入和解析CSS文件作为JS)。有一个解决方案,此已在Stack Overflow上发布 a>,但它只解决如果你还没有使用Mocha的编译器。我使用Babel 5.我试过下面的,但似乎Mocha不支持传递多个编译器:
// npm test script
mocha ./src/**/*Test.js --compilers css:./ scripts / mocha-webpack-compiler.js js:babel / register
// scripts / mocha-webpack-compiler.js
function noop(){
return null;
}
require.extensions ['。css'] = noop;
有多种Mocha编译器的方法,或更好的方式告诉Mocha不要尝试parse Webpack CSS import?
建议的解决方案由@Giles B下面;这正是我需要的。然而,由于我仍然在Babel 5,我需要一些调整,如下所示:
mocha.opts
- require scripts / support / babelhook
--require scripts / support / mocha-webpack-compiler
scripts / babelhook.js
require('babel / register') ;
scripts / mocha-webpack-compiler.js
function noop(){
return null;
}
require.extensions ['。css'] = noop;
mocha脚本
mocha ./src/**/*Test.js
我使用 babel
和 babel-core
,两个版本 5.8.23
。
我遇到了同样的问题,只是让它工作,所以在我的mocha.opts文件中, require
调用:
- require test / babelhook
--require test / css-null-compiler
在 babelhook.js
我有一个require语句加载babel:
//这个文件是mocha.opts
//此文件的唯一目的是确保
//在任何
//测试代码之前激活babel转换器,并使用相同的babel选项
require(babel-register)();
然后从链接提供我设置 css-null-compiler.js
如下: p>
//防止Mocha编译类
function noop(){
return null;
}
require.extensions ['。css'] = noop;
require.extensions ['。scss'] = noop;
希望有帮助。
When testing .js
files that have Webpack CSS imports like import './style.css'
, Mocha throws a syntax error (because it tries to import and parse the CSS file as JS). There is a solution for this that has already been posted on Stack Overflow, but it only addresses if you aren't already using a compiler with Mocha. I'm using Babel 5. I've tried the following, but it seems that Mocha doesn't support passing multiple compilers:
// npm test script
mocha ./src/**/*Test.js --compilers css:./scripts/mocha-webpack-compiler.js js:babel/register
// scripts/mocha-webpack-compiler.js
function noop() {
return null;
}
require.extensions['.css'] = noop;
Is there a way to have multiple Mocha compilers, or a better way to tell Mocha not to try to parse Webpack CSS imports?
EDIT:
I like the proposed solution by @Giles B below; it was exactly what I needed. However, since I am still on Babel 5 I needed a few tweaks as shown below:
mocha.opts
--require scripts/support/babelhook
--require scripts/support/mocha-webpack-compiler
scripts/babelhook.js
require('babel/register');
scripts/mocha-webpack-compiler.js
function noop() {
return null;
}
require.extensions['.css'] = noop;
mocha script
mocha ./src/**/*Test.js
This is working for me using babel
and babel-core
, both version 5.8.23
.
I came across the same problem and just got it working, so in my mocha.opts file I added the following require
calls:
--require test/babelhook
--require test/css-null-compiler
In babelhook.js
I have one require statement to load babel:
// This file is required in mocha.opts
// The only purpose of this file is to ensure
// the babel transpiler is activated prior to any
// test code, and using the same babel options
require("babel-register")();
Then from the link you provided I setup css-null-compiler.js
as follows:
// Prevent Mocha from compiling class
function noop() {
return null;
}
require.extensions['.css'] = noop;
require.extensions['.scss'] = noop;
Hope that helps.
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