Error TS2307: Module 'class-validator' not found

I have been trying to incorporate the class-validator module into my TypeScript project. However, when I compile TypeScript, I encounter the following warning:

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

The problematic line in my code is as follows:

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

In order to address this issue, I have set up my gulp task 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"));
    });

Furthermore, my tsconfig.json file is configured as follows:

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

Any suggestions or feedback on how to resolve this issue?

Answer №1

To ensure proper module resolution in TypeScript, add the following line to your `tsconfig.json` file under `compilerOptions`:

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

For more information on how TypeScript resolves imported modules, visit: https://www.typescriptlang.org/docs/handbook/module-resolution.html#node

Answer №3

To successfully add the class-validator dependency, follow this command:

npm install class-validator

Answer №4

When using class-validator, don't forget to also install typescript types for validator.

To do so, run npm install @types/validator

Answer №5

To successfully implement call validation, make sure to install the call-validator and class-transformer packages

npm i --save class-validator class-transformer

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