karma.conf.js

const puppeteer = require("puppeteer");

process.env.TEST = true;
process.env.NODE_ENV = "test";
process.env.CHROME_BIN = puppeteer.executablePath();

const webpackConfig = require("./webpack.config.js")({ production: false, karma: true });

delete webpackConfig.entry;
delete webpackConfig.output.filename;

module.exports = (config) => {
  "use strict";

  var configuration = {
    basePath: "",
    frameworks: ["webpack", "mocha", "sinon-chai"],
    files: [
      { pattern: "node_modules/reflect-metadata/Reflect.js", include: true },
      { pattern: "node_modules/bluebird/js/browser/bluebird.js", include: true },
      { pattern: "./test/index.ts", include: true },
      { pattern: "**/*.map", served: true, included: false, watched: true }
    ],
    preprocessors: {
      "./test/index.ts": ["webpack"],
      "./**/**/**/**.ts": ["sourcemap"]
    },
    webpack: webpackConfig,
    webpackMiddleware: {
      noInfo: true
    },
    plugins: [
      "karma-webpack",
      "karma-sourcemap-writer",
      "karma-sourcemap-loader",
      "karma-mocha-reporter",
      "karma-mocha",
      "karma-sinon-chai",
      "karma-coverage-istanbul-reporter"
    ],
    mime: {
      "text/x-typescript": ["ts", "tsx"]
    },
    reporters: config.singleRun ? ["dots", "mocha", "coverage-istanbul"] : ["dots", "mocha"],
    coverageIstanbulReporter: {
      "reports": ["html", "lcov", "lcovonly", "text-summary"],
      "dir": "coverage",
      "combineBrowserReports": true,
      "fixWebpackSourcePaths": true,
      "skipFilesWithNoCoverage": true,
      "report-config": {
        html: {
          subdir: "html-report"
        }
      }
    },
    port: 9876,
    colors: true,
    logLevel: config.LOG_INFO,
    autoWatch: true,
    browsers: [],
    browserNoActivityTimeout: 50000
  };

  if (process.env.TRAVIS) {
    configuration.browsers.push("ChromeHeadless");
    configuration.plugins.push("karma-chrome-launcher");
  } else {
    configuration.browsers.push("ChromeHeadless");
    configuration.plugins.push("karma-chrome-launcher");
  }

  config.set(configuration);
};