nestjs-custom-class-validators/src/decorators/enumArray.decorator.ts

This package contains a few custom validator I have found to be repetitive, So I made templates that handles both class-validator checks and Swagger configuration

import { Transform } from "class-transformer";
import { ArrayMinSize, IsOptional } from "class-validator";
import { ICustomEnumJSONArrayValidatorOptions } from "../dto/customValidatorOptions.dto";
import {
  TransformStringToJSONArray,
  TransformSingleItemToArray,
  TransformSortStringArray,
} from "../transformers/validatorTransformers";
import {
  swaggerProp,
  notEmptyFn,
  isArrayFn,
  isEnumFn,
} from "../utils/commonDecoratorFunctions";

export function CustomEnumJSONArrayValidator(
  details: ICustomEnumJSONArrayValidatorOptions
) {
  const { validEnum, optional, defaultValue, description } = details;

  const mySwaggerProp = swaggerProp({
    optional,
    description,
    defaultValue,
    type: "array",
  });

  return function (target: any, key: string) {
    if (optional) IsOptional()(target, key);
    notEmptyFn(key)(target, key);
    Transform(TransformStringToJSONArray)(target, key);
    Transform(TransformSingleItemToArray)(target, key);
    ArrayMinSize(1)(target, key);
    isArrayFn(key)(target, key);
    isEnumFn(key, validEnum as any, true)(target, key);
    Transform(TransformSortStringArray)(target, key);
    mySwaggerProp(target, key);
  };
}