stryker-js: no coverage and error

Summary

I get an error (times a lot []) (11272) ERROR log4js A worker log process hung up unexpectedly { Error: read ECONNRESET at TCP.onread (net.js:659:25) errno: 'ECONNRESET', code: 'ECONNRESET', syscall: 'read' } and report is bad (like it doesn’t test good(?))

function add(a, b) {
    return a + b;
}
module.exports = add;

const add = require("../src/add.js");
describe("add.js", () => {
    it("2 + 4 should equal 6", () => {
        expect(add(2, 4)).toBe(6);
    });
});

Command I run:

• node ./node_modules/stryker/bin/stryker run --basePath=C:\Users\19gro\Desktop\hi

Stryker config

const basePath = process.argv[3].replace("--basePath=", "");
const path = require("path");

module.exports = config => {
    config.set({
        "coverageAnalysis": "perTest",
        "files": [
            path.join(basePath, "src/**/*.js"),
            path.join(basePath, "tests/**/*.js")
        ],
        "karma": {
            "config": {
                basePath,
                "browsers": [ "ChromeHeadless" ]
            },
            "configFile": "../../karma.conf.js",
            "project": "custom"
        },
        "mutate": [ path.join(basePath, "src/**/*.js") ],
        "mutator": "javascript",
        "packageManager": "npm",

        "reporter": [ "html", "clear-text" ],
        "testFramework": "jasmine",
        "testRunner": "karma"
    });
};

Karma config

module.exports = config => {
    config.set({
        "basePath": config.basePath || "/",
        "browsers": config.coverage ? [ "ChromeHeadless" ] : [ "Chrome" ],
        "client": { "clearContext": false },
        "colors": true,
        "coverageReporter": {
            "dir": "reports",
            "reporters": [
                {
                    "subdir": "coverage",
                    "type": "html"
                }
            ]
        },
        "failOnEmptyTestSuite": false,
        "files": [
            "./src/**/*.js",
            "./tests/**/*.spec.js"
        ],
        "frameworks": [ "jasmine" ],
        "preprocessors": {
            "./src/**/*.js": [ "webpack", "sourcemap" ],
            "./tests/**/*.spec.js" : [ "webpack", "sourcemap" ]
        },
        "reporters": config.coverage ? [ "progress", "coverage" ] : [ "progress", "kjhtml" ],
        "webpack": {
            "cache": true,
            "devtool": "inline-source-map",
            "module": {
                "rules": [
                    {
                        "enforce": "post",
                        "exclude": /node_modules|\.spec\.js$|tests/,
                        "test": /\.js$/,
                        "use": {
                            "loader": "istanbul-instrumenter-loader",
                            "options": { "esModules": true }
                        }
                    }
                ]
            }
        }
    });
};

Stryker environment

+-- stryker - current
+-- stryker-api - current

+-- jasmine@3.2.0
+-- karma@3.0.0

Your Environment

software	version(s)
node	10.6.0
npm	6.1.0
Operating System	win 10

Add stryker.log

stryker.log