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: loader.go
    path of file: ./repos/Xray-core/infra/conf
    
    the code of the file until where you have to start completion: package conf

import (
	"encoding/json"
	"strings"
)

type ConfigCreator func() interface{}

type ConfigCreatorCache map[string]ConfigCreator

func (v ConfigCreatorCache) RegisterCreator(id string, creator ConfigCreator) error {
	if _, found := v[id]; found {
		return newError(id, " already registered.").AtError()
	}

	v[id] = creator
	return nil
}

func (v ConfigCreatorCache) CreateConfig(id strin
    
func (v *JSONConfigLoader) Load(raw []byte) (interface{}, string, error) {
	var obj map[string]json.RawMessage
	if err := json.Unmarshal(raw, &obj); err != nil {
		return nil, "", err
	}
	rawID, found := obj[v.idKey]
	if !found {
		return nil, "", newError(v.idKey, " not found in JSON context").AtError()
	}
	var id string
	if err := json.Unmarshal(rawID, &id); err != nil {
		return nil, "", err
	}
	rawConfig := json.RawMessage(raw)
	if len(v.configKey) > 0 {
		configValue, found := obj[v.configKey]
		if found {
			rawConfig = configValue
		} else {
			// Default to empty json object.
			rawConfig = json.RawMessage([]byte("{}"))
		}
	}
	config, err := v.LoadWithID([]byte(rawConfig), id)
	if err != nil {
		return nil, id, err
	}
	return config, id, nil
}