/*
* @license Apache-2.0
*
* Copyright (c) 2021 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

// TypeScript Version: 4.1

/// <reference types="node"/>

import { Transform } from 'stream';

/**
* Interface defining stream options.
*/
interface Options {
	/**
	* Specifies whether a stream should operate in object mode (default: `false`).
	*/
	objectMode?: boolean;

	/**
	* Specifies how `Buffer` objects should be decoded to strings (default: `null`).
	*/
	encoding?: string | null;

	/**
	* Specifies the `Buffer` level for when `write()` starts returning `false`.
	*/
	highWaterMark?: number;

	/**
	* Separator used to join streamed data (default: `/\r?\n/`).
	*/
	sep?: string | RegExp;

	/**
	* Specifies whether the stream should remain open even if one side ends (default: `false`).
	*/
	allowHalfOpen?: boolean;

	/**
	* Specifies whether the readable side should be in object mode (default: `false`).
	*/
	readableObjectMode?: boolean;
}

/**
* Interface defining a stream constructor which is both "newable" and "callable".
*/
interface Constructor {
	/**
	* Split stream constructor.
	*
	* @param options - stream options
	* @param options.sep - separator used to split streamed data (default: /\r?\n/)
	* @param options.objectMode - specifies whether a stream should operate in object mode (default: false)
	* @param options.encoding - specifies how `Buffer` objects should be decoded to `strings` (default: null)
	* @param options.highWaterMark - specifies the `Buffer` level for when `write()` starts returning `false`
	* @param options.allowHalfOpen - specifies whether the stream should remain open even if one side ends (default: false)
	* @param options.writableObjectMode - specifies whether the writable side should be in object mode (default: false)
	* @returns split stream
	*
	* @example
	* var SplitStream = splitStream;
	* var stream = new SplitStream();
	*
	* stream.write( '1\n2\n3' );
	* stream.end();
	*/
	new( options?: Options ): Transform; // newable

	/**
	* Split stream constructor.
	*
	* @param options - stream options
	* @param options.sep - separator used to split streamed data (default: /\r?\n/)
	* @param options.objectMode - specifies whether a stream should operate in object mode (default: false)
	* @param options.encoding - specifies how `Buffer` objects should be decoded to `strings` (default: null)
	* @param options.highWaterMark - specifies the `Buffer` level for when `write()` starts returning `false`
	* @param options.allowHalfOpen - specifies whether the stream should remain open even if one side ends (default: false)
	* @param options.writableObjectMode - specifies whether the writable side should be in object mode (default: false)
	* @returns split stream
	*
	* @example
	* var stream = splitStream();
	*
	* stream.write( '1\n2\n3' );
	* stream.end();
	*/
	( options?: Options ): Transform; // callable

	/**
	* Creates a reusable stream factory.
	*
	* @param options - stream options
	* @param options.sep - separator used to split streamed data (default: /\r?\n/)
	* @param options.objectMode - specifies whether a stream should operate in object mode (default: false)
	* @param options.encoding - specifies how `Buffer` objects should be decoded to `strings` (default: null)
	* @param options.highWaterMark - specifies the `Buffer` level for when `write()` starts returning `false`
	* @param options.allowHalfOpen - specifies whether the stream should remain open even if one side ends (default: false)
	* @param options.writableObjectMode - specifies whether the writable side should be in object mode (default: false)
	* @returns stream factory
	*
	* @example
	* var opts = {
	*     'sep': '\t',
	*     'objectMode': true,
	*     'encoding': 'utf8'
	* };
	*
	* var factory = splitStream.factory( opts );
	*
	* // Create 10 identically configured streams...
	* var streams = [];
	* var i;
	* for ( i = 0; i < 10; i++ ) {
	*     streams.push( factory() );
	* }
	*/
	factory( options?: Options ): () => Transform;

	/**
	* Returns a stream with `objectMode` set to `true`.
	*
	* @param options - stream options
	* @param options.sep - separator used to split streamed data (default: /\r?\n/)
	* @param options.encoding - specifies how `Buffer` objects should be decoded to `strings` (default: null)
	* @param options.highWaterMark - specifies the `Buffer` level for when `write()` starts returning `false`
	* @param options.allowHalfOpen - specifies whether the stream should remain open even if one side ends (default: false)
	* @param options.writableObjectMode - specifies whether the writable side should be in object mode (default: false)
	* @throws must provide valid options
	* @returns split stream
	*
	* @example
	* var stream = splitStream.objectMode({
	*     'sep': ','
	* });
	*
	* stream.write( 'a,b,c' );
	* stream.end();
	*/
	objectMode( options?: Options ): Transform;
}

/**
* Returns a split stream.
*
* @param options - stream options
* @throws must provide valid options
* @returns stream instance
*
* @example
* var SplitStream = splitStream;
* var stream = new SplitStream();
*
* stream.write( '1\n2\n3' );
* stream.end();
*
* @example
* var stream = splitStream();
*
* stream.write( '1\n2\n3' );
* stream.end();
*
* @example
* var opts = {
*     'sep': '\t',
*     'objectMode': true,
*     'encoding': 'utf8'
* };
*
* var factory = splitStream.factory( opts );
*
* // Create 10 identically configured streams...
* var streams = [];
* var i;
* for ( i = 0; i < 10; i++ ) {
*     streams.push( factory() );
* }
*
* @example
* var stream = splitStream.objectMode({
*     'sep': ','
* });
*
* stream.write( 'a,b,c' );
* stream.end();
*/
declare var splitStream: Constructor;


// EXPORTS //

export = splitStream;