TS2307: Cannot find module 'class-validator'

I'm attempting to use the class-validator module in a typescript project. However when I compile typescript issues the following warning:

src/main/ts/domain/Order.ts(1,48): error TS2307: Cannot find module 'class-validator'.

The line it is complaining about looks like this:

 import { IsInt, IsNotEmpty, IsDate, Min } from "class-validator";

I have gulp setup like this:

 var gulp = require('gulp'); var ts = require('gulp-typescript'); var tsProject = ts.createProject("tsconfig.json"); gulp.task('default', function() { return tsProject.src() .pipe(tsProject()) .js.pipe(gulp.dest("target/main/js")); });

And my tsconfig.json looks like this:

 { "files": [ "src/main/ts/**/*.ts" ], "compilerOptions": { "experimentalDecorators": true, "noImplicitAny": true, "target": "es6" } }

Thoughts?

4 Answers

Set "moduleResolution": "node" in your tsconfig.json:

{ "compilerOptions": { "experimentalDecorators": true, "moduleResolution": "node", "noImplicitAny": true, "target": "es6" }
}

You can find more info on how TypeScript resolves your imported modules here:

This worked for me: yarn add graphql class-validator type-graphql

Source:

You need to install typescript types for validator in addition to installing class-validator.

That is npm install @types/validator

You need ti install class-validator dependency , use this commond:

npm install class-validator