/**
 * Shared helpers for TS skill handlers.
 *
 * These were previously copy-pasted across gen-image / gen-video /
 * gen-digital-human / gen-voice. Centralizing them keeps argument coercion and
 * image-input resolution identical across every atomic generator.
 *
 * Lives under handlers/ (not src/ root) so the compiled `dist/handlers/shared.js`
 * travels with the rest of the handler bundle when ab-agent copies `dist/`.
 */
/** Truthy check tolerant of CLI string values (`--flag` → true, `--flag true` → 'true'). */
export declare function isTrue(value: unknown): boolean;
/**
 * Coerce a flag value into a finite number, or `undefined` when absent/empty.
 * Throws SkillError on a non-numeric value so callers fail fast with a clear msg.
 */
export declare function toNumber(value: unknown, name: string): number | undefined;
/** Coerce a repeatable flag (string | string[] | undefined) into a string array. */
export declare function toStringArray(value: unknown): string[];
/**
 * Resolve an image reference into a value the backend accepts:
 *   - http(s) URLs and data: URIs pass through unchanged
 *   - local file paths are read and base64-encoded into a `data:<mime>;base64,…` URI
 * Throws SkillError when a local path does not exist or is not a file.
 */
export declare function resolveImageInput(pathOrUrl: string): string;