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javascriptnode.jstypescriptdecoratornestjs

Typescript decorator mess

Is there a way to solve massive decorator use inside classes?

Here's an example of a single property of a class in my NestJS app, with an incomplete swagger documentation decorator:

  @ApiModelProperty({
    description: 'description',
  })
  @Expose()
  @MaxLength(100, { message: 'message' })
  @IsString({ message: 'message' })
  @ValidateIf(address=> address.id !== null)
  @NotEquals(undefined, { message: 'message' })
  address: string;

This gets huge and ugly in no time. Any way to make the code look cleaner, defining the decorators in another file, maybe?

Solution

  • Not really sure for how long this has existed under nestjs/common library, but I stumbled with this issue and in case someone else stumbles with this. After requesting help on their official discord, jmcdo29 suggested https://docs.nestjs.com/custom-decorators#decorator-composition which seems like the way to go.