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23 lines
632 B
23 lines
632 B
7 years ago
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import { Predicate, Validator, validatorSymbol } from '../predicates/predicate';
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/**
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* Operator which inverts all the validations.
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*
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* @param predictate Predicate to wrap inside the operator.
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*/
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export const not = <T extends Predicate>(predicate: T) => {
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predicate['addValidator'] = (validator: Validator<any>) => { // tslint:disable-line:no-string-literal
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const fn = validator.validator;
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const message = validator.message;
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validator.message = (x: any) => `[NOT] ${message(x)}`;
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validator.validator = (x: any) => !fn(x);
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predicate[validatorSymbol].push(validator);
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return predicate;
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};
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return predicate;
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};
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