/**
 * Repairs JSON that a provider cut off mid-value.
 *
 * Why this exists: when a structured call hits its output cap the provider
 * returns `finish_reason: "length"` and a payload that simply STOPS — commonly
 * inside a string, e.g.
 *
 *   {"chunks":[{"text":"…complete…"},{"text":"…trunca
 *
 * Every rung of the salvage ladder above this one hands that text to
 * `JSON.parse`, which rejects it outright, so a call that produced dozens of
 * perfectly good elements returned NOTHING. This trims back to the last element
 * that actually completed, drops the partial tail, and closes whatever
 * containers were left open — turning a total loss into an N-1 result the
 * caller's schema can validate.
 *
 * Deliberately conservative: a value is "complete" only when the input proves it
 * (a separating comma, or a closing bracket). A bare trailing token such as the
 * `3` in `[1,2,3` could itself be a truncated `35`, so it is dropped too.
 *
 * Pure and total — never throws.
 *
 * @param raw - The model's raw text. Leading prose / markdown fences are skipped
 *   up to the first `{` or `[`.
 * @returns Parseable JSON text, the input verbatim when it already parses, or
 *   `null` when nothing recoverable is present.
 */
export declare function repairTruncatedJson(raw: string): string | null;
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