How to use the apify-shared/consts.ENV_VARS.HEADLESS function in apify-shared

before(() => {
    prevEnvHeadless = process.env[ENV_VARS.HEADLESS];
    process.env[ENV_VARS.HEADLESS] = '1';

    // Find free port for the proxy
    return portastic.find({ min: 50000, max: 50100 }).then((ports) => {
        return new Promise((resolve, reject) => {
            const httpServer = http.createServer();

            // Setup proxy authorization
            httpServer.authenticate = function (req, fn) {
                // parse the "Proxy-Authorization" header
                const auth = req.headers['proxy-authorization'];
                if (!auth) {
                    // optimization: don't invoke the child process if no
                    // "Proxy-Authorization" header was given
                    // console.log('not Proxy-Authorization');
                    return fn(null, false);
                }

before(() => {
    prevEnvHeadless = process.env[ENV_VARS.HEADLESS];
    process.env[ENV_VARS.HEADLESS] = '1';

    // Find free port for the proxy
    return portastic.find({ min: 50000, max: 50100 }).then((ports) => {
        return new Promise((resolve, reject) => {
            const httpServer = http.createServer();

            // Setup proxy authorization
            httpServer.authenticate = function (req, fn) {
                // parse the "Proxy-Authorization" header
                const auth = req.headers['proxy-authorization'];
                if (!auth) {
                    // optimization: don't invoke the child process if no
                    // "Proxy-Authorization" header was given
                    // console.log('not Proxy-Authorization');
                    return fn(null, false);

after(() => {
        log.setLevel(logLevel);
        process.env[ENV_VARS.HEADLESS] = prevEnvHeadless;
    });

before(() => {
        prevEnvHeadless = process.env[ENV_VARS.HEADLESS];
        process.env[ENV_VARS.HEADLESS] = '1';
        logLevel = log.getLevel();
        log.setLevel(log.LEVELS.ERROR);
    });

before(() => {
        logLevel = log.getLevel();
        log.setLevel(log.LEVELS.ERROR);
        prevEnvHeadless = process.env[ENV_VARS.HEADLESS];
        process.env[ENV_VARS.HEADLESS] = '1';
    });

before(async () => {
        prevEnvHeadless = process.env[ENV_VARS.HEADLESS];
        process.env[ENV_VARS.HEADLESS] = '1';

        if (!fs.existsSync(TEST_ACTORS_FOLDER)) fs.mkdirSync(TEST_ACTORS_FOLDER);
        process.chdir(TEST_ACTORS_FOLDER);
    });

after(async () => {
        process.env[ENV_VARS.HEADLESS] = prevEnvHeadless;

        process.chdir('../');
        if (fs.existsSync(TEST_ACTORS_FOLDER)) await rimrafPromised(TEST_ACTORS_FOLDER);
    });

before(() => {
        logLevel = log.getLevel();
        log.setLevel(log.LEVELS.ERROR);
        prevEnvHeadless = process.env[ENV_VARS.HEADLESS];
        process.env[ENV_VARS.HEADLESS] = '1';
    });

export const getDefaultBrowseOptions = () => {
    return {
        headless: process.env[ENV_VARS.HEADLESS] === '1' && process.env[ENV_VARS.XVFB] !== '1',
        browserName: 'chrome',
        proxyUrl: null,
        userAgent: null,
    };
};

checkParamOrThrow(options.stealthOptions, 'options.stealthOptions', 'Maybe Object');
    if (options.useApifyProxy && options.proxyUrl) throw new Error('Cannot combine "options.useApifyProxy" with "options.proxyUrl"!');
    if (options.liveView || options.liveViewOptions) {
        log.deprecated('Live view is no longer available in Apify.launchPuppeteer() and launchPuppeteerOptions. '
            + 'Use options.useLiveView in PuppeteerPool for an updated version. '
            + 'For live view with Apify.launchPuppeteer(), use Apify.LiveViewServer.');
    }

    const puppeteer = getPuppeteerOrThrow(options.puppeteerModule);

    const optsCopy = Object.assign({}, options);

    optsCopy.args = optsCopy.args || [];
    optsCopy.args.push('--no-sandbox');
    if (optsCopy.headless == null) {
        optsCopy.headless = process.env[ENV_VARS.HEADLESS] === '1' && process.env[ENV_VARS.XVFB] !== '1';
    }
    if (optsCopy.useChrome && (optsCopy.executablePath === undefined || optsCopy.executablePath === null)) {
        optsCopy.executablePath = process.env[ENV_VARS.CHROME_EXECUTABLE_PATH] || getTypicalChromeExecutablePath();
    }
    if (optsCopy.useApifyProxy) {
        optsCopy.proxyUrl = getApifyProxyUrl({
            groups: optsCopy.apifyProxyGroups,
            session: optsCopy.apifyProxySession,
            groupsParamName: 'options.apifyProxyGroups',
            sessionParamName: 'options.apifyProxySession',
        });
    }
    if (optsCopy.defaultViewport === undefined) {
        optsCopy.defaultViewport = LAUNCH_PUPPETEER_DEFAULT_VIEWPORT;
    }