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
    optionMergeStrategies: Object.create(null),
  
    /**
     * Whether to suppress warnings.
     */
    silent: false,
  
    /**
     * Show production mode tip message on boot?
     */
    productionTip: process.env.NODE_ENV !== 'production',
  
    /**
     * Whether to enable devtools
     */
    devtools: process.env.NODE_ENV !== 'production',
  
    /**
     * Whether to record perf
     */
    performance: false,
  
    /**
     * Error handler for watcher errors
     */
    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)
  