Custom-class-validator-tools NPM

String type decorator

Decorator	Type	Description
@IsNullableString	string	null	If want to ignore value ≠= ‘’, @IsNullableString({ blank: true })
@IsUndefinableString	string	undefined	If want to ignore value ≠= ‘’, @IsUndefinableString({ blank: true })
@IsOptionalString	string	null	undefined	If want to ignore value ≠= ‘’, @IsOptionalString({ blank: true })
@IsNotEmptyNumberString	string	Checks a string is a number
@IsNotEmptyBooleanString	string	Checks a string is a boolean
@IsNullableNumberString	string	null	Checks a string is a number or null
@IsNullableBooleanString	string	null	Checks a string is a boolean or null
@IsUndefinableNumberString	string	undefined	Checks a string is a number or undefined
@IsUndefinableBooleanString	string	undefined	Checks a string is a boolean or null
@IsOptionalNumberString	string	null	undefined	Checks a string is a number or null or undefined
@IsOptionalBooleanString	string	null	undefined	Checks a string is a boolean or null or undefined

Number type decorator

Decorator	Type
@IsNotEmptyNumber	number
@IsNullableNumber	nubmer	null
@IsUndefinableNumber	number	undefined
@IsOptionalNumber	number	null	undefined

Boolean type decorator

Decorator	Type
@IsNotEmptyBoolean	boolean
@IsNullableBoolean	boolean	null
@IsUndefinalbeBoolean	boolean	undefined
@IsOptionalBoolean	boolean	null	undefined

ValidateNested usage case

import { isNotEmptyString, IsNotEmptyBoolean, isNullable, IsUndefinable } from 'custom-class-validator-tools';
import { IsInstance, ArrayNotEmpty, ValidateNested } from 'class-validator';
import { Type } from 'class-transformer';

class Tag {
  @IsNotEmptyString()
  tag1: string;
  @IsNotEmptyString()
  tag2: string;
}

class Result {
  @IsNotEmptyBoolean()
  failed: boolean;
}

class Post {
  @IsNullable()
  @ArrayNotEmpty()
  @IsInstance(Tag, { each: true })
  @ValidateNested({ each: true })
  @Type(() => Tag)
  tags: Tag[] | null;

  @IsUndefinable()
  @IsInstance(Result)
  @ValidateNested()
  @Type(() => Result)
  result?: Result;
}

class-transformer class-validator dayjs fp-ts

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