ES2017 NEST JS @IsEmpty Unable to resolve signature of property decorator when called as an expression.This expression is not callable. is not empty

Question

Hi people im newer with Nest JS and i trying to add dto validator but for example when i tried to add isNotEmpty or Max compiler show me this error:

Unable to resolve signature of property decorator when called as an expression. This expression is not callable.

DTO:

import { Transform, Type } from 'class-transformer';
import { IsInt, isNotEmpty } from 'class-validator';

export class MessagesQueryDTO {
  @isNotEmpty()
  @IsInt()
  @Type(() => Number)
  readonly limit: number;
  
  @isNotEmpty()
  @Type(() => Number)
  @IsInt()
  readonly skip: number;
}

My config.json

{
  "exclude": ["**/*spec.ts"],
  "compilerOptions": {
    "module": "commonjs",
    "declaration": true,
    "removeComments": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "allowSyntheticDefaultImports": true,
    "target": "es2017",
    "sourceMap": true,
    "outDir": "./dist",
    "baseUrl": "./",
    "incremental": true,
    "esModuleInterop": true,
  }
}

Answer 1

To expand on Juan's answer, isNotEmpty is the internally used check from class-valdiator and can be used as a direct method. IsNotEmtpy (notice the capitalization) is the decorator, and should be used with @ to denote it as a decorator.

Answer 2

The isNotEmpty decorator should be IsNotEmpty with the first letter in uppercase.