senrecep/tsentials/tsentials-predicate

import { Predicate } from 'tsentials/predicate';
import type { Refinement } from 'tsentials/predicate';
// Create predicates
const isAdult = Predicate.from((u: User) => u.age >= 18);
const isActive = Predicate.from((u: User) => u.isActive);
// Combine with logic operators
Predicate.and(isAdult, isActive);
Predicate.or(isAdult, isGuest);
Predicate.not(isAdult);
// Combine many
Predicate.all(isAdult, isActive, hasBalance);
Predicate.any(isAdmin, isModerator);
// Refinement (type guard)
const isString = Predicate.refinement((x: unknown): x is string => typeof x === 'string');
const isNumber = Predicate.refinement((x: unknown): x is number => typeof x === 'number');
// Combine refinements (narrows to intersection)
const isStringAndNumber = Predicate.andRefinement(isString, isNumber); // Refinement<unknown, string & number>
// Convert predicate to a Rule-compatible function
Predicate.toRule(isAdult, validationError); // (value) => error | undefined