class-validator not working nest-typescript-starter

I’m submitting a…

[ ] Regression 
[x] Bug report
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

class-validator not working

Expected behavior

class-validator should work

Minimal reproduction of the problem with instructions

Following the docs (https://docs.nestjs.com) untill the ‘pipes’ section (https://docs.nestjs.com/pipes). The pipes section creates a ValidationPipe. If you do not use this one, but try to use the ValidationPipe from the class-validator (npm install class-validator --save). The validation will not work.

@nestjs/common has a node_modules with the same dependency (class-validator). However if you do not install class-validator through npm, starting the application (npm start) will throw an error 'Cannot find module ‘class-validator’ '.

Workarounds:

• npm install class-validator --save to install the dependency, remove node_modules in @nestjs/common or
• npm install class-validator --save to install the dependency, do not remove node_modules in @nestjs/common but instead copy paste the installed class-validator from node_modules to your project files and reference to that directory as import

What is the motivation / use case for changing the behavior?

Removing the dependency from @nestjs/common would make it so that the project (following the docs) would work after installing the class-validator dependency.

Environment

Nest version:
  "name": "nest-typescript-starter",
  "version": "1.0.0"

    "@nestjs/common": "^4.5.9",
    "@nestjs/core": "^4.5.10",
    "@nestjs/microservices": "^4.5.8",
    "@nestjs/testing": "^4.5.5",
    "@nestjs/websockets": "^4.5.8",


 
For Tooling issues:
- Node version: v9.11.1 
- Platform:  Linux


Others:

[jawad-aziz-farhad]

I thought its part of nestjs core but its not. Installing package separately solved this issue npm i class-validator --save

[luminblade]

There is a ticket open for this on the class-validator site.

link

my workaround (for now) is to import the same library

import { IsInt, IsString } from '@nestjs/common/node_modules/class-validator';