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27 lines
701 B
27 lines
701 B
import {Predicate, validatorSymbol} from '../predicates/predicate';
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/**
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* Operator which inverts the following validation.
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*
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* @hidden
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* @param predictate Predicate to wrap inside the operator.
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*/
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export const not = <T, P extends Predicate<T>>(predicate: P) => {
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const originalAddValidator = predicate.addValidator;
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predicate.addValidator = validator => {
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const fn = validator.validator;
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const message = validator.message;
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validator.message = (x: T, label: string) => `[NOT] ${message(x, label)}`;
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validator.validator = (x: T) => !fn(x);
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predicate[validatorSymbol].push(validator);
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predicate.addValidator = originalAddValidator;
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return predicate;
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};
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return predicate;
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};
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