ow/dist/operators/not.js

Function argument validation for humans

import randomId from '../utils/random-id.js';
import { validatorSymbol } from '../predicates/predicate.js';
/**
Operator which inverts the following validation.

@hidden

@param predictate - Predicate to wrap inside the operator.
*/
export const not = (predicate) => {
    const originalAddValidator = predicate.addValidator;
    predicate.addValidator = (validator) => {
        const { validator: function_, message, negatedMessage } = validator;
        const placeholder = randomId();
        validator.message = (value, label) => (negatedMessage
            ? negatedMessage(value, label)
            : message(value, placeholder).replace(/ to /, '$&not ').replace(placeholder, label));
        validator.validator = (value) => !function_(value);
        predicate[validatorSymbol].push(validator);
        predicate.addValidator = originalAddValidator;
        return predicate;
    };
    return predicate;
};