snabbdom/karma.conf.js

const ci = !!process.env.CI;
const watch = !!process.env.WATCH;
const live = !!process.env.LIVE;

const ip = "bs-local.com";

const browserstack = require("./browserstack-karma.cjs");

// https://www.browserstack.com/open-source (text search "parallels")
const BROWSERSTACK_OPEN_SOURCE_CONCURRENCY = 5;

const browsers = ci
  ? Object.keys(browserstack)
  : live
  ? undefined
  : watch
  ? ["Chrome"]
  : ["ChromeHeadless", "FirefoxHeadless"];

module.exports = function (config) {
  config.set({
    basePath: ".",
    frameworks: ["mocha", "karma-typescript"],
    // list of files / patterns to load in the browser
    files: [{ pattern: "src/**/*.ts" }, { pattern: process.env.FILES_PATTERN }],
    preprocessors: {
      "**/*.ts": "karma-typescript",
    },
    plugins: [
      "karma-mocha",
      "karma-typescript",
      "karma-mocha-reporter",
      require("./karma-benchmark-reporter.cjs"),
      "karma-chrome-launcher",
      "karma-firefox-launcher",
      "karma-browserstack-launcher",
    ],
    hostname: ci ? ip : "localhost",
    karmaTypescriptConfig: {
      compilerOptions: {
        esModuleInterop: true,
      },
      include: [process.env.FILES_PATTERN, "src/**/*.ts"],
    },
    browserStack: {
      name: "Snabbdom",
      retryLimit: 1,
    },
    client: {
      captureConsole: true,
    },
    customLaunchers: browserstack,
    reporters: ["karma-typescript", "mocha", "benchmark", "BrowserStack"],
    mochaReporter: {
      showDiff: true,
    },
    port: 9876,
    colors: true,
    autoWatch: true,
    browsers: browsers,
    singleRun: !watch && !live,
    concurrency: ci ? BROWSERSTACK_OPEN_SOURCE_CONCURRENCY : Infinity,
  });
};