Error: invalid "instanceof" keyword value Promise

Question

问题描述

npm run dev
报错： Error: invalid "instanceof" keyword value Promise
`

PS D:\work\new\201812\renren-fast-vue-master\renren-fast-vue-master> npm ru
n dev

> renren-fast-vue@1.2.2 dev D:\work\new\201812\renren-fast-vue-master\renre
n-fast-vue-master
> webpack-dev-server --inline --progress --config build/webpack.dev.conf.js

D:\work\new\201812\renren-fast-vue-master\renren-fast-vue-master\node_modul
es\webpack\node_modules\ajv-keywords\keywords\instanceof.js:52
    throw new Error('invalid "instanceof" keyword value ' + c);
    ^

Error: invalid "instanceof" keyword value Promise
    at getConstructor (D:\work\new\201812\renren-fast-vue-master\renren-fas
t-vue-master\node_modules\webpack\node_modules\ajv-keywords\keywords\instan
ceof.js:52:11)
    at Ajv.compile (D:\work\new\201812\renren-fast-vue-master\renren-fast-v
ue-master\node_modules\webpack\node_modules\ajv-keywords\keywords\instanceo
f.js:21:27)
    at Object.useCustomRule (D:\work\new\201812\renren-fast-vue-master\renr
en-fast-vue-master\node_modules\webpack\node_modules\ajv\lib\compile\index.
js:275:26)
    at Object.generate_custom [as code] (D:\work\new\201812\renren-fast-vue
-master\renren-fast-vue-master\node_modules\webpack\node_modules\ajv\lib\do
tjs\custom.js:32:24)
    at Object.generate_validate [as validate] (D:\work\new\201812\renren-fa
st-vue-master\renren-fast-vue-master\node_modules\webpack\node_modules\ajv\
lib\dotjs\validate.js:347:35)
    at Object.generate_anyOf [as code] (D:\work\new\201812\renren-fast-vue-
master\renren-fast-vue-master\node_modules\webpack\node_modules\ajv\lib\dot
js\anyOf.js:34:27)
    at generate_validate (D:\work\new\201812\renren-fast-vue-master\renren-
fast-vue-master\node_modules\webpack\node_modules\ajv\lib\dotjs\validate.js
:347:35)
    at localCompile (D:\work\new\201812\renren-fast-vue-master\renren-fast-

`

问题出现的环境背景及自己尝试过哪些方法

node V10.14.1
npm V6.5.0
webpack V4.2.8
webpack-dev-server V3.1.4

相关代码

renrenfast-vue开源项目执行 npm run dev报错
关键是之前运行都很正常

你期待的结果是什么？实际看到的错误信息又是什么？

期待能知晓报错原因

Answer 1

throw new Error('invalid "instanceof" keyword value ' + c);
Error: Invalid "instanceof" keyword
报错 throw new Error('invalid "instanceof" keyword value ' + c)解决办法
根据你的报错，搜到一些和你问题类似的，参考下

Answer 2

楼主降成哪个版本了？