You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: browser_type.go
    path of file: ./repos/k6/vendor/github.com/grafana/xk6-browser/chromium
    
    the code of the file until where you have to start completion: package chromium

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"math/rand"
	"os/exec"
	"path/filepath"
	"sort"
	"strings"
	"time"

	"github.com/grafana/xk6-browser/common"
	"github.com/grafana/xk6-browser/env"
	"github.com/grafana/xk6-browser/k6ext"
	"github.com/grafana/xk6-browser/log"
	"github.com/grafana/xk6-browser/storage"

	k6common "go.k6.io/k6/js/common"
	k6modules "go.k6.io/k6/js/modules"
	k6lib "go.k6.io/k6/lib"

	"github.com/dop251/goja"
)

// BrowserType provides methods to launch a Chrome browser instance or connect to an existing one.
// It's the entry point for interacting with the browser.
type 
    
func setFlagsFromK6Options(flags map[string]any, k6opts *k6lib.Options) error {
	if k6opts == nil {
		return nil
	}

	hostResolver := []string{}
	if currHostResolver, ok := flags["host-resolver-rules"]; ok {
		hostResolver = append(hostResolver, fmt.Sprintf("%s", currHostResolver))
	}

	// Add the host resolver rules.
	//
	// This is done by marshaling the k6 hosts option to JSON and then
	// unmarshaling it to a map[string]string. This is done because the
	// k6 v0.42 changed Hosts from a map to types.NullHosts and doesn't
	// expose the map anymore.
	//
	// TODO: A better way to do this would be to handle the resolver
	// rules by communicating with Chromium (and then using Hosts's
	// Match method) instead of passing the rules via the command line
	// to Chromium.
	var rules map[string]string
	b, err := json.Marshal(k6opts.Hosts)
	if err != nil {
		return fmt.Errorf("marshaling hosts option: %w", err)
	}
	if err := json.Unmarshal(b, &rules); err != nil {
		return fmt.Errorf("unmarshaling hosts option: %w", err)
	}
	for k, v := range rules {
		hostResolver = append(hostResolver, fmt.Sprintf("MAP %s %s", k, v))
	}
	if len(hostResolver) > 0 {
		sort.Strings(hostResolver)
		flags["host-resolver-rules"] = strings.Join(hostResolver, ",")
	}

	return nil
}