ERROR [launcher]: Cannot load browser "ChromeHeadless": it is not registered!

Expected behaviour

after update of typescript, webpack, removing phantomJs and adding puppeteer tests will pass

Actual behaviour

when running tests, karma-launcher cannot load ChromeHeadless. and log this error:

16 01 2018 13:49:07.627:INFO [compiler.karma-typescript]: Compiling project using Typescript 2.6.2
16 01 2018 13:49:17.757:INFO [compiler.karma-typescript]: Compiled 132 files in 9499 ms.
16 01 2018 13:49:26.779:INFO [bundler.karma-typescript]: Bundled imports for 131 file(s) in 8510 ms.
16 01 2018 13:49:29.302:WARN [karma]: No captured browser, open http://localhost:9876/
16 01 2018 13:49:29.317:INFO [karma]: Front-end scripts not present. Compiling...
16 01 2018 13:49:36.550:INFO [karma]: Karma v2.0.0 server started at http://0.0.0.0:9876/
16 01 2018 13:49:36.550:INFO [launcher]: Launching browser ChromeHeadless with unlimited concurrency
16 01 2018 13:49:36.550:ERROR [launcher]: Cannot load browser "ChromeHeadless": it is not registered! Perhaps you are missing some plugin?
16 01 2018 13:49:36.550:ERROR [karma]: Found 1 load error
[13:49:36] Automated tests ended with FAILURE!!! error: process exited with code 1

• Karma version: 2.0.0
• Relevant part of your karma.config.js file

process.env.CHROME_BIN  =  require('puppeteer').executablePath()
module.exports = function(config) {
    config.set({
        karmaTypescriptConfig: {
            tsconfig: "./tsconfig.json",
            bundlerOptions: {
                exclude: [
                    "react/addons",
                    "react/lib/ExecutionEnvironment",
                    "react/lib/ReactContext",
                ]
            },
            coverageOptions: {
                instrumentation: true,
                exclude: /\.(d|spec|test)\.(ts|tsx)/i
            },
            reports: {
                "cobertura": {
                    "directory": "build_reports/coverage",
                    "filename": "coverage.xml",
                    "subdirectory": "cobertura"
                },
                "html": "build_reports/coverage",
                "text-summary": ""
            }
        },
        frameworks: ['mocha', 'karma-typescript'],
        files: [
            { pattern: '!(node_modules|Server|dist)/**/*.+(ts|tsx)' }
        ],
        "exclude": [
            "**/*.d.ts"
        ],
        preprocessors: {
            '!(node_modules|Server|dist)/**/*.+(ts|tsx)': 'karma-typescript',
        },
        reporters: ['progress', 'junit', 'mocha', 'karma-typescript'],

        junitReporter: {
            outputDir: 'build_reports/test-results',
            outputFile: 'test-results.xml'
        },

        browsers: ['ChromeHeadless'],
        plugins: [
            'karma-chrome-launcher',
            'karma-typescript',
            'karma-mocha',
            'karma-junit-reporter',
            'karma-mocha-reporter'
        ],
        singleRun: false,

        colors: true,

        logLevel: config.LOG_INFO,
    });
};

tried to have plugins inside plugin section or remove plugins section altogether with no success.

[manoharreddyporeddy]

I am getting same error with version 2.2.0 of 'karma-chrome-launcher'. Any solutions?

Same with me.

[swetapatil1]

I am getting same error with version 2.2.0 of 'karma-chrome-launcher'. Any solutions?