/**
 * extract.ts, turning a probe result into one observation.
 *
 * Three extractors, all bounded and all pure:
 *   jsonpath , `$`, `.key`, `["key"]`, `[0]`, `[*]` against parsed JSON
 *   regex    , one match, optionally a capture group
 *   jq-subset, a `.path[…]` selector optionally piped into length/keys/first/last
 *
 * None of them evaluates an expression. `jq-subset` is a hand-written walker
 * over a validated selector grammar, not a jq interpreter, precisely so there
 * is no expression language to escape from.
 */
import type { TriggerExtract, TriggerObservation, TriggerValue } from './types.js';
/** Deterministic string form used by change / transition / dedup comparisons. */
export declare function stableText(value: TriggerValue): string;
/** Numeric coercion, or null when the value simply is not a number. */
export declare function numericOf(value: TriggerValue): number | null;
export declare function toObservation(value: TriggerValue, at: number): TriggerObservation;
/**
 * Runs one extractor over a probe result. Throws nothing on a miss, a miss is
 * `null`, which is a perfectly good observation for a `change` rule to see.
 */
export declare function runExtract(extract: TriggerExtract, input: TriggerValue): TriggerValue;
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