export type ExtractOpts = {
    commonJS?: boolean;
    double?: boolean;
    indent?: number;
    log?: (msg: string) => void;
    output?: string | URL;
    package?: string;
    regex?: string | null;
    semi?: boolean;
    startDir?: string;
    trailing?: boolean;
    types?: boolean;
    unlessPreRelease?: boolean;
};
export type RequiredExtractOpts = Required<ExtractOpts>;
/**
 * @typedef {Object} ExtractOpts packageExtract options
 * @property {boolean} [commonJS=false] Create a commonJS file instead of ESM
 * @property {boolean} [double=false] True for double quotes, otherwise single
 *   quotes
 * @property {number} [indent=2] Number of spaces to indent. <0 for tabs. 0
 *   for no newlines.
 * @property {(msg: string) => void} [log=console.log] How to log to stdout.
 * @property {string|URL} [output="package.js"] Filename for output, or "-"
 *   for stdout.
 * @property {string} [package="package.json"] Package file to extract from,
 *   found from cwd, searching up
 * @property {string|null} [regex] If given, regular expression to
 *   replace instead of regenerating output.  Regex should have named matching
 *   group to replace, where the matching group name is the desired field.
 * @property {boolean} [semi=false] Add semicolons to the end of each
 *   variable.
 * @property {string} [startDir=process.cwd()] Which directory to start the
 *   search from.
 * @property {boolean} [trailing=false] Add trailing commas for objects or
 *   arrays?
 * @property {boolean} [types=false] Attempt to add typescript type comments
 *   to extracted items.
 * @property {boolean} [unlessPreRelease=false] Only perform the action if
 * this is not a pre-release
 */
/**
 * @typedef {Required<ExtractOpts>} RequiredExtractOpts
 */
/**
 * Extract one or more fields from a JSON file.
 * @param {ExtractOpts} options
 * @param {string[]} [fields=['version']]
 */
export declare function packageExtract(options?: ExtractOpts, fields?: string[]): Promise<void>;