class-validator/esm2015/decorator/common/IsOptional.js

Decorator-based property validation for classes.

import { ValidationTypes } from '../../validation/ValidationTypes';
import { ValidationMetadata } from '../../metadata/ValidationMetadata';
import { getMetadataStorage } from '../../metadata/MetadataStorage';
/**
 * Checks if value is missing and if so, ignores all validators.
 */
export function IsOptional(validationOptions) {
    return function (object, propertyName) {
        const args = {
            type: ValidationTypes.CONDITIONAL_VALIDATION,
            target: object.constructor,
            propertyName: propertyName,
            constraints: [
                (object, value) => {
                    return object[propertyName] !== null && object[propertyName] !== undefined;
                },
            ],
            validationOptions: validationOptions,
        };
        getMetadataStorage().addValidationMetadata(new ValidationMetadata(args));
    };
}
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