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declare global {  interface Request<ParamKeyType extends string = string> {    param: {      (key: ParamKeyType): string      (): Record<ParamKeyType, string>    }    paramData?: Record<ParamKeyType, string>    query: {      (key: string): string      (): Record<string, string>    }    queries: {      (key: string): string[]      (): Record<string, string[]>    }    header: {      (name: string): string      (): Record<string, string>    }  }}
export function extendRequestPrototype() {  if (!!Request.prototype.param as boolean) {    // already extended    return  }
  Request.prototype.param = function (this: Request, key?: string) {    if (this.paramData) {      if (key) {        return this.paramData[key]      } else {        return this.paramData      }    }    return null  } as InstanceType<typeof Request>['param']
  Request.prototype.header = function (this: Request, name?: string) {    if (name) {      return this.headers.get(name)    } else {      const result: Record<string, string> = {}      for (const [key, value] of this.headers) {        result[key] = value      }      return result    }  } as InstanceType<typeof Request>['header']
  Request.prototype.query = function (this: Request, key?: string) {    const url = new URL(this.url)    if (key) {      return url.searchParams.get(key)    } else {      const result: Record<string, string> = {}      for (const key of url.searchParams.keys()) {        result[key] = url.searchParams.get(key) || ''      }      return result    }  } as InstanceType<typeof Request>['query']
  Request.prototype.queries = function (this: Request, key?: string) {    const url = new URL(this.url)    if (key) {      return url.searchParams.getAll(key)    } else {      const result: Record<string, string[]> = {}      for (const key of url.searchParams.keys()) {        result[key] = url.searchParams.getAll(key)      }      return result    }  } as InstanceType<typeof Request>['queries']}