export type ConditionValue = string | number | boolean | null | undefined;
/**
 * Predicate factory functions for use as guard conditions.
 * Each returns a (value: ConditionValue) => boolean function.
 */
/** Pass only if value is strictly true (boolean). */
export declare function isTrue(): (v: ConditionValue) => boolean;
/** Pass only if value is strictly false (boolean). */
export declare function isFalse(): (v: ConditionValue) => boolean;
/** Pass if value is truthy (loose). */
export declare function isTruthy(): (v: ConditionValue) => boolean;
/** Pass if value is falsy (loose). */
export declare function isFalsy(): (v: ConditionValue) => boolean;
/** Pass if value > n. Returns false for non-numbers. */
export declare function gt(n: number): (v: ConditionValue) => boolean;
/** Pass if value < n. Returns false for non-numbers. */
export declare function lt(n: number): (v: ConditionValue) => boolean;
/** Pass if value >= n. Returns false for non-numbers. */
export declare function gte(n: number): (v: ConditionValue) => boolean;
/** Pass if value <= n. Returns false for non-numbers. */
export declare function lte(n: number): (v: ConditionValue) => boolean;
/** Pass if min <= value <= max (inclusive). Returns false for non-numbers. */
export declare function between(min: number, max: number): (v: ConditionValue) => boolean;
/** Pass if value === expected (strict equality). */
export declare function eq(expected: ConditionValue): (v: ConditionValue) => boolean;
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