import type { ConfigValue, ConfigEvaluationMetadata, EvaluatedValue, EvaluationPayload, Duration } from "./types";
/**
 * Parse an ISO 8601 duration string in the Quonfig grammar (e.g. "PT90S",
 * "PT1H30M", "P1DT6H2M1.5S") into a Duration. Milliseconds are exact: the
 * fraction is read as decimal digits (no float arithmetic) and rounded half
 * up to an integer ms count. Returns undefined for anything outside the
 * grammar.
 */
export declare const parseDuration: (iso: unknown) => Duration | undefined;
/** True for a value shaped like a parsed Duration ({ ms, seconds } numbers). */
export declare const isDuration: (value: unknown) => value is Duration;
/**
 * Parsed config entry — holds the parsed value, its type, raw server value, and metadata.
 */
export declare class Config {
    key: string;
    value: ConfigValue;
    type: string;
    rawValue: EvaluatedValue | undefined;
    configEvaluationMetadata: ConfigEvaluationMetadata | undefined;
    /**
     * Set when the server value could not be coerced to its declared type
     * (today: a duration outside the grammar). The value is then undefined.
     * Never contains the raw value.
     */
    coercionError: string | undefined;
    constructor(key: string, value: ConfigValue, type: string, rawValue?: EvaluatedValue, metadata?: ConfigEvaluationMetadata);
    /**
     * Parse the server evaluation payload into a map of Config objects.
     */
    static digest(payload: EvaluationPayload): {
        [key: string]: Config;
    };
}