/**
 * Spec where each key maps to a predicate function.
 */
export type WhereSpec<T> = {
    [K in keyof T]?: (value: T[K]) => boolean;
};
/**
 * Create a predicate function that tests if an object matches a spec.
 * Each property in the spec is a predicate that the corresponding object property must satisfy.
 *
 * @param spec - Object where values are predicate functions
 * @returns Predicate function
 *
 * @example
 * const isAdult = whereFast({ age: n => n >= 18 });
 * isAdult({ name: 'alice', age: 25 }); // true
 * isAdult({ name: 'bob', age: 15 }); // false
 *
 * @example
 * users.filter(whereFast({ active: Boolean, role: r => r === 'admin' }));
 */
export declare function whereFast<T extends object>(spec: WhereSpec<T>): (obj: T) => boolean;
/**
 * Create a predicate function that tests if an object has properties equal to the spec values.
 * Simpler version of whereFast for exact equality checks.
 *
 * @param spec - Object with expected property values
 * @returns Predicate function
 *
 * @example
 * const isAdmin = whereEqFast({ role: 'admin', active: true });
 * isAdmin({ role: 'admin', active: true, name: 'alice' }); // true
 * isAdmin({ role: 'user', active: true }); // false
 */
export declare function whereEqFast<T extends object>(spec: Partial<T>): (obj: T) => boolean;
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