/**
 * JQHTML Cache Key Serializer
 *
 * Produces a deterministic string for a plain-data argument value, so that two
 * structurally equal objects built on separate renders yield the SAME cache key.
 * Templates rebuild `{contact_id: 12}` on every render, so identity-based keying
 * can never match and permanently opts the receiving component out of caching.
 *
 * ---------------------------------------------------------------------------
 * THIS IS NOT `process_for_serialization()` IN local-storage.ts. DO NOT MERGE THEM.
 *
 * That serializer stores cache VALUES and deliberately degrades: a function, a
 * symbol or a circular reference is dropped and serialization continues, because
 * losing a method while keeping the data is the right trade for a payload.
 *
 * For a cache KEY that policy manufactures false hits. Two argument objects that
 * differ ONLY by a callback would serialize identically, and a component would
 * render with another component's cached content - strictly worse than not
 * caching at all. So this serializer DECLINES on the first value it cannot
 * express exactly. It never drops anything.
 * ---------------------------------------------------------------------------
 *
 * Allow-list, and nothing else: null, undefined, boolean, number, string, Date,
 * arrays, and plain objects (prototype Object.prototype or null), in any nesting.
 * Everything else declines with a reason that reaches `data-nocache`.
 */
export type Serialize_Result = {
    ok: true;
    text: string;
} | {
    ok: false;
    reason: string;
};
/**
 * Values larger than this are declined rather than keyed. The supported case is a
 * handful of key/value pairs or a list of ids - not a payload. Declining loudly
 * beats spending the budget on a key nobody benefits from.
 */
export declare const MAX_KEY_BYTES = 500;
/**
 * Serialize a value for use in a cache key.
 *
 * @returns `{ok: true, text}` when the value is exactly expressible, or
 *          `{ok: false, reason}` naming why it is not. Never throws.
 */
export declare function serialize_for_cache_key(value: any): Serialize_Result;
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