/**
 * Prompt resolution utilities for q/x commands.
 *
 * Supports three input channels:
 *   1. --prompt-file <path>  — read content from a file
 *   2. stdin pipe/redirect   — read from process.stdin when not a TTY
 *   3. argv prompt           — positional argument passed directly on the command line
 *
 * When multiple sources are present, argv is used as a short label/prefix
 * and the file/stdin content is appended after a blank line.
 */
/**
 * Read all bytes from stdin (pipe or redirect).
 * Returns empty string when stdin is a TTY (interactive terminal).
 */
export declare function readStdin(): Promise<string>;
/**
 * Resolve the final prompt from argv, stdin pipe, or --prompt-file.
 *
 * Priority:
 *   1. promptFile is specified → read file content
 *   2. argv is present → use argv (stdin is NOT read — prevents hang in child processes)
 *   3. argv is empty, no promptFile → read stdin pipe/redirect
 *   4. argv + promptFile both present → `${argv}\n\n${fileContent}`
 *   5. Neither present → return '' (caller decides error handling)
 *
 * @param _readStdin - injectable stdin reader, defaults to the module-level
 *   readStdin. Exposed as a parameter so unit tests can substitute a stub
 *   without fighting ESM module binding rules.
 */
export declare function resolvePrompt(argvPrompt: string, promptFile?: string, _readStdin?: () => Promise<string>): Promise<string>;