// Copyright Joyent, Inc. and other Node contributors.

//

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

//

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

const {

ObjectDefineProperty,

} = primordials;

const {

promisify: { custom: customPromisify },

} = require('internal/util');

const pipeline = require('internal/streams/pipeline');

const eos = require('internal/streams/end-of-stream');

const internalBuffer = require('internal/buffer');

// Lazy loaded

let promises = null;

const Stream = module.exports = require('internal/streams/legacy').Stream;

Stream.Readable = require('internal/streams/readable');

Stream.Writable = require('internal/streams/writable');

Stream.Duplex = require('internal/streams/duplex');

Stream.Transform = require('internal/streams/transform');

Stream.PassThrough = require('internal/streams/passthrough');

Stream.pipeline = pipeline;

const { addAbortSignal } = require('internal/streams/add-abort-signal');

Stream.addAbortSignal = addAbortSignal;

Stream.finished = eos;

function lazyLoadPromises() {

if (promises === null) promises = require('stream/promises');

return promises;

}

ObjectDefineProperty(Stream, 'promises', {

configurable: true,

enumerable: true,

get() {

return lazyLoadPromises();

}

});

ObjectDefineProperty(pipeline, customPromisify, {

enumerable: true,

get() {

return lazyLoadPromises().pipeline;

}

});

ObjectDefineProperty(eos, customPromisify, {

enumerable: true,

get() {

return lazyLoadPromises().finished;

}

});

// Backwards-compat with node 0.4.x

Stream.Stream = Stream;

Stream._isUint8Array = require('internal/util/types').isUint8Array;

Stream._uint8ArrayToBuffer = function _uint8ArrayToBuffer(chunk) {

return new internalBuffer.FastBuffer(chunk.buffer,

chunk.byteOffset,

chunk.byteLength);

};