错误处理

api.ts

import {
  ValidationError,
  AuthenticationError,
  RoleError
} from './errors'


export function post (name: string) {
  if (typeof name !== 'string') {
    throw new ValidationError('name must be string')
  }
  
  const user = useSession()
  if (!user) {
    throw new AuthenticationError()
  }
  
  const role = useRole()
  if (role !== 'admin') {
    throw new RoleError('must be admin')
  }
  
}

app.tsx

import {
  ValidationError,
  AuthenticationError,
  RoleError
} from './errors'
import { post } from '@/apis'

try {
  await post(1)
} catch (e) {
  if (e instanceof ValidationError) {
    alert('参数错误')
  }
  
  if (e instanceof AuthenticationError) {
    alert('请登录')
  }
  
  if (e instanceof RoleError) {
    alert('管理员才能操作')
  }
  
  alert('未知错误，请重试')
}

ValidationError.ts

import { superjson } from '@midwayjs/hooks'

export class ValidationError extends Error {
  constructor (message) {
    super(message)
  }
}

superjson.registerClass(ValidationError)