/**
 * Validate and normalize an explicitly supplied acceptance array.
 *
 * @remarks
 * Absent input remains undefined. String entries are trimmed and blank strings
 * are dropped; an explicitly empty result remains [] so update can clear it.
 * Entries stay literal, including pipes and quoted unions. Nonstring entries
 * reject the entire input before any task mutation.
 *
 * @param acceptance - Optional array of literal string criteria supplied by the caller.
 * @returns Trimmed nonblank criteria, including an explicit empty array; undefined for absent input.
 * @throws CleoError when the input is not an array or includes a nonstring entry.
 * @example
 * ```typescript
 * const criteria = [' literal a|b ', '', ' verify output '];
 * normalizeAcceptance(criteria);
 * // ['literal a|b', 'verify output']
 * normalizeAcceptance([]); // [] requests an explicit clear on update
 * ```
 */
export declare function normalizeAcceptance(acceptance: readonly string[] | undefined): string[] | undefined;
/**
 * Parse acceptance criteria from a raw CLI string.
 *
 * @remarks
 * Supports two formats:
 * - JSON array: `'["AC1","AC2","AC3"]'` (literal entries, normalized whitespace)
 * - Pipe-separated: `"AC1|AC2|AC3"` (tokenized via `splitAcceptance`)
 *
 * The pipe-separated form uses a bracket+quote+escape-aware tokenizer so
 * criteria containing `ENUM (hot|cold|batch|embed)`, quoted string-unions
 * like `mode: 'realtime-token'|'batch'`, or escaped literals (`\|`) are
 * preserved as single tokens rather than being shredded.
 *
 * @param raw - Raw string from `--acceptance` flag
 * @returns Array of trimmed, non-empty acceptance criteria strings
 * @throws CleoError for malformed explicit JSON arrays or nonstring JSON elements.
 * @example
 * ```typescript
 * parseAcceptanceCriteria('first|ENUM (hot|cold)|third');
 * // ['first', 'ENUM (hot|cold)', 'third']
 * const raw = '["literal a|b", " verified "]';
 * parseAcceptanceCriteria(raw);
 * // ['literal a|b', 'verified']
 * ```
 *
 * @bug https://github.com/kryptobaseddev/cleo/issues/409
 * @task T1490
 * @task T9839
 */
export declare function parseAcceptanceCriteria(raw: string): string[];
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