ethers.js/karma-esm.conf.js

"use strict";

module.exports = function(config) {
  config.set({
    basePath: "./output/karma",
    frameworks: [ 'mocha' ],
    files: [
        { pattern: "./ethers.esm.js", type: "module" },
        { pattern: "./tests.esm.js", type: "module" }
    ],
    reporters: [ 'karma' ],
    plugins: [
      'karma-mocha',
      'karma-chrome-launcher',
      require('./packages/tests/karma-reporter')
    ],
    port: 9876,
    logLevel: config.LOG_INFO,
    browsers: [ 'ChromeHeadless', "HeadlessLittleLiar" ],
    autoWatch: false,
    singleRun: true,
    browserNoActivityTimeout: 3600000,
    customLaunchers: {
      HeadlessLittleLiar: {
        base: 'ChromeHeadless',
        // https://peter.sh/experiments/chromium-command-line-switches/
        flags: [
          '--disable-extensions',

          // Enable this to help debug CORS issues (otherwise fetch throws a useless TypeError)
          //'--disable-web-security',

          '--enable-automation',

          // Cloudflare will block (on the testnet endpoints) any traffic
          // from a headless chome (based on the user agent), so we lie
          // This was take from Safari, because that is what I had on-hand
          '--user-agent', 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15',

          // https://stackoverflow.com/questions/58484124/karma-disconnectedreconnect-failed-before-timeout-of-with-chromeheadless
          '--disable-gpu',
          '--no-sandbox'
        ],
      }
    },
    /*
    client: {
      mocha: {
        grep: 'utf',
      }
    }
    */
  })
}