/**
 * Replaces key value pairs in a stream of lines.
 * @param {AsyncIterable<string>} source input as lines
 * @param {KeyValueUpdates} updates
 * @param {KeyValueTransformOptions} options
 * @return {AsyncIterable<string>} lines with replaces key value pairs
 */
export function keyValueTransformer(source: AsyncIterable<string>, updates: KeyValueUpdates, options?: KeyValueTransformOptions): AsyncIterable<string>;
export function stringsToLines(source: any): AsyncGenerator<string, void, unknown>;
export function Uint8ArraysToLines(source: any, decoder?: TextDecoder): AsyncGenerator<string, void, unknown>;
/**
 * @typedef {Function} KeyValueUpdates
 *
 * The last call to KeyValueUpdates will be with an undefined key to provide required 'default' key value pairs.
 *
 * @param {string} key current key
 * @param {string} value current value
 * @param {Set<string>} presentKeys the already seen keys
 * @return {AsyncIterable<string[]>} updated key and value pairs
 */
/**
 * @typedef {Function} Lines
 * @return {Iterable<string>}
 */
/**
 * @typedef {Object} KeyValueTransformOptions
 * @property {Function} extractKeyValue 1st. line with key and value
 * @property {Function} extractValueContinuation additional lines holding only values
 * @property {string} lineEnding used to separate lines
 * @property {string} keyValueSeparator chars to separate key from value like '=' or ':'
 * @property {Lines} keyValueLines to generate line(s) for a key value(s) pair
 * @property {Lines} [trailingLines] lines coming after all key values have been written
 * @property {Lines} [headLines] lines before all key values have been written
 */
/**
 * @type {KeyValueTransformOptions}
 * Options to describe key value pair separated by a colon ':'
 */
export const colonSeparatedKeyValuePairOptions: KeyValueTransformOptions;
/**
 * @type {KeyValueTransformOptions}
 * Options to describe key value pair separated by an equal sign '='
 */
export const equalSeparatedKeyValuePairOptions: KeyValueTransformOptions;
/**
 * @type {KeyValueTransformOptions}
 * Options to describe key value pair separated by a colon ':'
 */
export const colonSeparatedKeyValuePairOptionsDoublingKeys: KeyValueTransformOptions;
/**
 * The last call to KeyValueUpdates will be with an undefined key to provide required 'default' key value pairs.
 */
export type KeyValueUpdates = Function;
export type Lines = Function;
export type KeyValueTransformOptions = {
    /**
     * 1st. line with key and value
     */
    extractKeyValue: Function;
    /**
     * additional lines holding only values
     */
    extractValueContinuation: Function;
    /**
     * used to separate lines
     */
    lineEnding: string;
    /**
     * chars to separate key from value like '=' or ':'
     */
    keyValueSeparator: string;
    /**
     * to generate line(s) for a key value(s) pair
     */
    keyValueLines: Lines;
    /**
     * lines coming after all key values have been written
     */
    trailingLines?: Function | undefined;
    /**
     * lines before all key values have been written
     */
    headLines?: Function | undefined;
};