/** Checks whether an unknown value is a non-empty string. */
export declare function isNonEmptyString(value: unknown): value is string;
/** Checks whether an unknown value is a positive safe integer. */
export declare function isPositiveSafeInteger(value: unknown): value is number;
/** Checks whether an unknown value is a non-negative safe integer. */
export declare function isNonNegativeSafeInteger(value: unknown): value is number;
/** Checks whether a string is the canonical UTC ISO representation of a date. */
export declare function isCanonicalUtcIsoDate(value: unknown): value is string;
/** Checks whether a list contains at least one item. */
export declare function isNonEmptyList<T>(values: readonly T[]): boolean;
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