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Use Class-Validator in DTOs

Minimal code-snippet showcasing the problem

@isNotEmpty({ message: '' })  // ts error
@ApiProperty({ description: '手机号', example: '13222222222', required: true })
phone: number;

Actual behavior

Had the same issue and found out after a few hours that it is a typo.
isNotEmpty should be IsNotEmpty (capital I )

Mentioned here

As mentioned by others, the decorators start with a capital letter: @IsNotEmpty . The isNotEmpty is the validator function that is used by the decorator.

Closing this as there is no action to take.