export class ErrorMsg<T = { [key: string]: string | number | boolean }> extends Error {

  constructor(params: {
    msg: (f: T) => { [key: string]: string } & { en: string },
    params?: T,
    code?: number
    error?: Error
  }) {
    super(params.msg(params.params!).en)
    this.params = params.params
    this.msg = params.msg
    this.error = this.error
  }
  code?: number
  params?: T
  msg: (f: T) => { [key: string]: string } & { en: string }
  error?: Error

  getStringTemplate() {
    let params = Object.assign({}, this.params)
    Object.keys(params).forEach(e => params[e] = `{${e}}`)
    return this.msg(params)
  }
}

// Example usage
// new ErrorMsg({
//   msg: params => ({
//     en: `The error is ${params.is}`,
//     cn: `错误是${params.is}`,
//   }),
//   params: {
//     is: 'hahaha'
//   },
//   code: 10001
// })