text: /* @flow */
  
  import {
    no,
    noop,
    identity
  } from 'shared/util'
  
  import { LIFECYCLE_HOOKS } from 'shared/constants'
  
  export type Config = {
    // user
    optionMergeStrategies: { [key: string]: Function };
    silent: boolean;
    productionTip: boolean;
    performance: boolean;
    devtools: boolean;
    errorHandler: ?(err: Error, vm: Component, info: string) => void;
    warnHandler: ?(msg: string, vm: Component, trace: string) => void;
    ignoredElements: Array<string | RegExp>;
    keyCodes: { [key: string]: number | Array<number> };
  
    // platform
    isReservedTag: (x?: string) => boolean;
    isReservedAttr: (x?: string) => boolean;
    parsePlatformTagName: (x: string) => string;
    isUnknownElement: (x?: string) => boolean;
    getTagNamespace: (x?: string) => string | void;
    mustUseProp: (tag: string, type: ?string, name: string) => boolean;
  
    // private
    async: boolean;
  
    // legacy
    _lifecycleHooks: Array<string>;
  };
  
  export default ({
    /**
     * Option merge strategies (used in core/util/options)
     */
    // $flow-disable-line
    // 合并策略
    optionMergeStrategies: Object.create(null),
  
    // 取消警告
    silent: false,
  
    // 加载时，显示生产提示
    productionTip: process.env.NODE_ENV !== 'production',
  
    // 开启调试工具
    devtools: process.env.NODE_ENV !== 'production',
  
    // 记录性能表现
    performance: false,
  
    // 监视错误的处理
    errorHandler: null,
  
    /**
     * Warn handler for watcher warns
     */
    warnHandler: null,
  
    /**
     * Ignore certain custom elements
     */
    ignoredElements: [],
  
    /**
     * Custom user key aliases for v-on
     */
    // $flow-disable-line
    keyCodes: Object.create(null),
  
    /**
     * Check if a tag is reserved so that it cannot be registered as a
     * component. This is platform-dependent and may be overwritten.
     */
    isReservedTag: no,
  
    /**
     * Check if an attribute is reserved so that it cannot be used as a component
     * prop. This is platform-dependent and may be overwritten.
     */
    isReservedAttr: no,
  
    /**
     * Check if a tag is an unknown element.
     * Platform-dependent.
     */
    isUnknownElement: no,
  
    /**
     * Get the namespace of an element
     */
    getTagNamespace: noop,
  
    /**
     * Parse the real tag name for the specific platform.
     */
    parsePlatformTagName: identity,
  
    /**
     * Check if an attribute must be bound using property, e.g. value
     * Platform-dependent.
     */
    mustUseProp: no,
  
    /**
     * Perform updates asynchronously. Intended to be used by Vue Test Utils
     * This will significantly reduce performance if set to false.
     */
    async: true,
  
    /**
     * Exposed for legacy reasons
     */
    _lifecycleHooks: LIFECYCLE_HOOKS
  }: Config)
  