[karma]: Oops! We've encountered a snag - the module [expose-loader?jQuery!jquery] couldn't be

Currently, I am working on setting up karma tests for typescript.

karma.conf.js

module.exports = function (config) {
    config.set({
        frameworks: ['jasmine', 'karma-typescript'],
        files: [
            {pattern: 'src/main/**/*.ts'}, // Actual code
            {pattern: 'src/test/**/*.ts'}, // Unit tests
        ],
        preprocessors: {
            'src/main/**/*.ts': ['karma-typescript', 'coverage'],
            'src/test/**/*.ts': ['karma-typescript']
        },
        reporters: ['progress', 'junit', 'coverage'],

        // the default configuration
        junitReporter: {
            ...
        },

        coverageReporter: {
            type: 'lcov',
            subdir: '.',
            dir: 'target/'
        },

        browsers: ['PhantomJS'],

        singleRun: true,
        autoWatch: true,
        logLevel: config.LOG_INFO,
        colors: true,
        port: 9876
     });
 };

The actual code does not have any content yet, but it includes:

import "expose-loader?jQuery!jquery";
import "expose-loader?Tether!tether";

import "../scss/main.scss";
import "bootstrap";

And here is a test example:

it("should expose jquery to window",  () => {
    expect(window["jQuery"]).toBeDefined();
    expect(window["$"]).toBeDefined();
});

The issue I'm facing is an error indicating that karma cannot recognize the expose-loader from webpack, resulting in this error message:

ERROR [karma]: Error: Unable to resolve module [expose-loader?jQuery!jquery]

If anyone could provide some insights into this matter, it would be greatly appreciated. When I manually add jQuery without expose-loader, everything works fine. However, I prefer to handle it the right way.

Thank you!

Answer №1

the issue stemmed from including actual code within the "files" instead of importing the class I needed to test. To address this, I adjusted the configuration as follows:

{pattern: 'src/main/**/!(file with expose-loader).ts', include:'false'}

This change excludes the file responsible for exposing global objects.

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