karma runs rebuild too many times after updating entry file

Here is my karma config:

module.exports = function (config) {
  config.set({
    browsers: ['Chrome'],
    singleRun: true,
    frameworks: [
      'mocha',
      'chai',
      'sinon'
    ],
    files: [
      'tests/unit/tests.js'
    ],
    plugins: [
      'karma-chrome-launcher',
      'karma-mocha',
      'karma-chai',
      'karma-sinon',
      'karma-sourcemap-loader',
      'karma-webpack',
      'karma-coverage'
    ],
    preprocessors: {
      'tests/unit/tests.js': [
        'webpack',
        'sourcemap'
      ]
    },
    reporters: [
      'progress',
      'coverage'
    ],
    webpack: {},
    coverageReporter: {
      type: 'html',
      dir: 'coverage/'
    }
  });
};

When I update ‘tests/unit/tests.js’, for example I add indent and then save this file, and after this I run “karma start” and after this in console output I see that webpack build runs about 19 times. Then I run “karma start” again and all works okay, webpack build runs only 1 time. Maybe you know why this happens?

[pavel06081991]

Is there any updates on this issue?

[codymikol]

Closing as this does not seem to be an issue in the 5.0.0 release, if anyone is still having problems, please free to open an issue and I’ll be happy to assist!