How to use the gemini-core.config function in gemini-core

'use strict';

const os = require('os');
const path = require('path');
const configparser = require('gemini-configparser');
const _ = require('lodash');
const GeminiError = require('../errors/gemini-error');
const util = require('./util');

const browserOptions = require('./browser-options');
const coreOptions = require('gemini-core').config.options;
const ENV_PREFIX = `${require('../../package').name}_`;

const is = util.is;
const anyObject = util.anyObject;
const resolveWithProjectRoot = util.resolveWithProjectRoot;
const booleanOption = util.booleanOption;
const positiveIntegerOption = util.positiveIntegerOption;
const root = configparser.root;
const section = configparser.section;
const option = configparser.option;
const map = configparser.map;

module.exports = root(
    section(_.extend(browserOptions.getTopLevel(), {
        system: section({
            projectRoot: option({

'use strict';

const _ = require('lodash');
const configparser = require('gemini-configparser');
const browserOptions = require('./browser-options');
const defaults = require('./defaults');
const optionsBuilder = require('./options-builder');

const options = optionsBuilder(_.propertyOf(defaults));

const section = configparser.section;
const map = configparser.map;

const coreOptions = require('gemini-core').config.options;

const ENV_PREFIX = `${require('../../package').name}_`;

const rootSection = section(_.extend(browserOptions.getTopLevel(), {

    browsers: map(section(browserOptions.getPerBrowser())),

    prepareEnvironment: options.optionalFunction('prepareEnvironment'),

    system: section({
        debug: options.boolean('debug'),

        mochaOpts: options.optionalObject('mochaOpts'),

        ctx: options.anyObject(),