Karma unit testing: Module name “react” has not been loaded yet for context: _. Use require([])

问题:

I am trying to set up the unit testing framework for react. While doing so, the following error has occurred. I have searched all over the internet with no solution that is working. below are the errors shown and code/packages that I am using.

debug error

04 03 2016 04:48:46.340:DEBUG [phantomjs.launcher]: Error: Module name "react" has not been loaded yet for context: _. Use require([]) http://requirejs.org/docs/errors.html#notloaded   04 03 2016 04:48:46.341:DEBUG [phantomjs.launcher]:   http://localhost:9876/base/node_modules/requirejs/require.js?6f53c895855c3743ac6fb7f99afc63ca5cdfd300:140 in defaultOnError   http://localhost:9876/base/node_modules/requirejs/require.js?6f53c895855c3743ac6fb7f99afc63ca5cdfd300:544 in onError   http://localhost:9876/base/node_modules/requirejs/require.js?6f53c895855c3743ac6fb7f99afc63ca5cdfd300:1429 in localRequire   http://localhost:9876/base/node_modules/requirejs/require.js?6f53c895855c3743ac6fb7f99afc63ca5cdfd300:1791 in requirejs  PhantomJS 2.1.1 (Mac OS X 0.0.0) ERROR   Error: Module name "react" has not been loaded yet for context: _. Use require([])   http://requirejs.org/docs/errors.html#notloaded   at /Users/lebeier/Documents/iMARS/node_modules/requirejs/require.js:140 PhantomJS 2.1.1 (Mac OS X 0.0.0): Executed 0 of 0 ERROR (0.053 secs / 0 secs)

node packages

  "dependencies": {     "bootstrap": "^3.3.6",     "highcharts": "^4.2.1",     "history": "^1.17.0",     "jquery": "^2.2.0",     "js-cookie": "^2.1.0",     "react": "^0.14.6",     "react-bootstrap": "^0.28.2",     "react-bootstrap-table": "^1.4.5",     "react-data-components": "^0.6.0",     "react-dom": "^0.14.6",     "react-highcharts": "^6.0.0",     "react-notification-system": "^0.2.6",     "react-router": "^1.0.3",     "reactify": "^1.1.1",     "toastr": "^2.1.2"   },   "devDependencies": {     "babel-core": "^6.6.4",     "babel-loader": "^6.2.4",     "babel-preset-es2015": "^6.3.13",     "babel-preset-react": "^6.3.13",     "babel-preset-stage-0": "^6.5.0",     "babelify": "^7.2.0",     "browserify": "^13.0.0",     "core-js": "^2.1.3",     "grunt-template-jasmine-requirejs": "^0.2.3",     "jasmine": "^2.4.1",     "karma": "^0.13.21",     "karma-babel-preprocessor": "^6.0.1",     "karma-browserify": "^5.0.2",     "karma-cli": "^0.1.2",     "karma-coverage": "^0.5.4",     "karma-jasmine": "^0.3.7",     "karma-phantomjs-launcher": "^1.0.0",     "karma-requirejs": "^0.2.5",     "karma-webpack": "^1.7.0",     "node-sass": "^3.4.2",     "phantomjs-prebuilt": "^2.1.4",     "requirejs": "^2.1.22",     "uglify": "^0.1.5",     "watchify": "^3.7.0",     "webpack": "^1.12.14"   }

karma.conf.js

module.exports = function(config) {   config.set({    // base path that will be used to resolve all patterns (eg. files, exclude)   basePath: '',    // frameworks to use   // available frameworks: https://npmjs.org/browse/keyword/karma-adapter   frameworks: ['jasmine', 'requirejs'],     // list of files / patterns to load in the browser   files: [       'tests/*.js'       //{ pattern: 'tests.webpack.js', watched: false },    ],    // list of files to exclude   //exclude: [   //  './node_modules/'   //],    plugins: [     'karma-jasmine',     'karma-requirejs',     'karma-phantomjs-launcher',     'karma-babel-preprocessor',     'karma-coverage',     'karma-browserify',     'karma-webpack'   ],    // preprocess matching files before serving them to the browser   // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor   preprocessors: {     'core/static/core/js/*.js' : ['babel'],     'tests/*.js' : ['babel'],     'tests.webpack.js': [ 'webpack']   },    babelPreprocessor:{     options: {         presets: ['es2015', 'react'],         plugins: ["transform-object-rest-spread"],         sourceMap: 'inline'     },     filename: function(file){         return file.originalPath.replace(/\.js$/, '.es5.js');     },     sourceFileName: function(file){         return file.originalPath;     }   },   // test results reporter to use   // possible values: 'dots', 'progress'   // available reporters: https://npmjs.org/browse/keyword/karma-reporter   reporters: ['dots'],     // web server port   port: 9876,     // enable / disable colors in the output (reporters and logs)   colors: true,     // level of logging   // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG   logLevel: config.LOG_DEBUG,     // enable / disable watching file and executing tests whenever any file changes   autoWatch: true,    // start these browsers   // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher   browsers: ['PhantomJS'],    // Continuous Integration mode   // if true, Karma captures browsers, runs the tests and exits   singleRun: true,    // Concurrency level   // how many browser should be started simultaneous   concurrency: Infinity,    webpack: {     devtool: 'inline-source-map',     modules: {         loaders: [             {                 test: /\.js$/,                  exclude: /node_modules/,                  loader: 'babel-loader',                 query:{                     presets: ['es2015', 'react']                 }             }         ],       },       watch: true,     },      webpackServer: {       noInfo: true,     }   }) }

tests/test.js

import React from 'react'; import ReactDOM from 'react-dom';  describe('Testing', ()=>{     it('sample test', ()=>{         var v = 2;         var parts = ['shoulders', 'knees'];         var lyrics = ['head', ...parts, 'and', 'toes'];         expect(v).toEqual(2);      });  });

Help is greatly appreciated!

回答1:

The error you describe is exactly what RequireJS gives you when you have a require call in the CommonJS form (require('modX')) instead of the AMD form (require(['modX'], function (modX) {...})), and the call is done without being wrapped in define. RequireJS provides some support for using the CommonJS form, but there is a minimum of work that must be done by the developer to ensure that it works. A script that starts with this won't work:

var modX = require('modX'); // rest of the module

You get the error message you got. You need this instead:

define(function (require) {     var modX = require('modX');     // rest of the module });

What is going on with your setup is that, as it is, Babel is transforming the ES6 modules into something that uses require without the define wrapper. In order to get Babel to output proper AMD modules, you need to install babel-plugin-transform-es2015-modules-amd and add transform-es2015-modules-amd to your list of Babel plugins. See the documentation here.

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