module.exports = (function() {
var __MODS__ = {};
var __DEFINE__ = function(modId, func, req) { var m = { exports: {}, _tempexports: {} }; __MODS__[modId] = { status: 0, func: func, req: req, m: m }; };
var __REQUIRE__ = function(modId, source) { if(!__MODS__[modId]) return require(source); if(!__MODS__[modId].status) { var m = __MODS__[modId].m; m._exports = m._tempexports; var desp = Object.getOwnPropertyDescriptor(m, "exports"); if (desp && desp.configurable) Object.defineProperty(m, "exports", { set: function (val) { if(typeof val === "object" && val !== m._exports) { m._exports.__proto__ = val.__proto__; Object.keys(val).forEach(function (k) { m._exports[k] = val[k]; }); } m._tempexports = val }, get: function () { return m._tempexports; } }); __MODS__[modId].status = 1; __MODS__[modId].func(__MODS__[modId].req, m, m.exports); } return __MODS__[modId].m.exports; };
var __REQUIRE_WILDCARD__ = function(obj) { if(obj && obj.__esModule) { return obj; } else { var newObj = {}; if(obj != null) { for(var k in obj) { if (Object.prototype.hasOwnProperty.call(obj, k)) newObj[k] = obj[k]; } } newObj.default = obj; return newObj; } };
var __REQUIRE_DEFAULT__ = function(obj) { return obj && obj.__esModule ? obj.default : obj; };
__DEFINE__(1662612701763, function(require, module, exports) {
var util = require('util');
var Stream = require('stream').Stream;
var DelayedStream = require('delayed-stream');

module.exports = CombinedStream;
function CombinedStream() {
  this.writable = false;
  this.readable = true;
  this.dataSize = 0;
  this.maxDataSize = 2 * 1024 * 1024;
  this.pauseStreams = true;

  this._released = false;
  this._streams = [];
  this._currentStream = null;
  this._insideLoop = false;
  this._pendingNext = false;
}
util.inherits(CombinedStream, Stream);

CombinedStream.create = function(options) {
  var combinedStream = new this();

  options = options || {};
  for (var option in options) {
    combinedStream[option] = options[option];
  }

  return combinedStream;
};

CombinedStream.isStreamLike = function(stream) {
  return (typeof stream !== 'function')
    && (typeof stream !== 'string')
    && (typeof stream !== 'boolean')
    && (typeof stream !== 'number')
    && (!Buffer.isBuffer(stream));
};

CombinedStream.prototype.append = function(stream) {
  var isStreamLike = CombinedStream.isStreamLike(stream);

  if (isStreamLike) {
    if (!(stream instanceof DelayedStream)) {
      var newStream = DelayedStream.create(stream, {
        maxDataSize: Infinity,
        pauseStream: this.pauseStreams,
      });
      stream.on('data', this._checkDataSize.bind(this));
      stream = newStream;
    }

    this._handleErrors(stream);

    if (this.pauseStreams) {
      stream.pause();
    }
  }

  this._streams.push(stream);
  return this;
};

CombinedStream.prototype.pipe = function(dest, options) {
  Stream.prototype.pipe.call(this, dest, options);
  this.resume();
  return dest;
};

CombinedStream.prototype._getNext = function() {
  this._currentStream = null;

  if (this._insideLoop) {
    this._pendingNext = true;
    return; // defer call
  }

  this._insideLoop = true;
  try {
    do {
      this._pendingNext = false;
      this._realGetNext();
    } while (this._pendingNext);
  } finally {
    this._insideLoop = false;
  }
};

CombinedStream.prototype._realGetNext = function() {
  var stream = this._streams.shift();


  if (typeof stream == 'undefined') {
    this.end();
    return;
  }

  if (typeof stream !== 'function') {
    this._pipeNext(stream);
    return;
  }

  var getStream = stream;
  getStream(function(stream) {
    var isStreamLike = CombinedStream.isStreamLike(stream);
    if (isStreamLike) {
      stream.on('data', this._checkDataSize.bind(this));
      this._handleErrors(stream);
    }

    this._pipeNext(stream);
  }.bind(this));
};

CombinedStream.prototype._pipeNext = function(stream) {
  this._currentStream = stream;

  var isStreamLike = CombinedStream.isStreamLike(stream);
  if (isStreamLike) {
    stream.on('end', this._getNext.bind(this));
    stream.pipe(this, {end: false});
    return;
  }

  var value = stream;
  this.write(value);
  this._getNext();
};

CombinedStream.prototype._handleErrors = function(stream) {
  var self = this;
  stream.on('error', function(err) {
    self._emitError(err);
  });
};

CombinedStream.prototype.write = function(data) {
  this.emit('data', data);
};

CombinedStream.prototype.pause = function() {
  if (!this.pauseStreams) {
    return;
  }

  if(this.pauseStreams && this._currentStream && typeof(this._currentStream.pause) == 'function') this._currentStream.pause();
  this.emit('pause');
};

CombinedStream.prototype.resume = function() {
  if (!this._released) {
    this._released = true;
    this.writable = true;
    this._getNext();
  }

  if(this.pauseStreams && this._currentStream && typeof(this._currentStream.resume) == 'function') this._currentStream.resume();
  this.emit('resume');
};

CombinedStream.prototype.end = function() {
  this._reset();
  this.emit('end');
};

CombinedStream.prototype.destroy = function() {
  this._reset();
  this.emit('close');
};

CombinedStream.prototype._reset = function() {
  this.writable = false;
  this._streams = [];
  this._currentStream = null;
};

CombinedStream.prototype._checkDataSize = function() {
  this._updateDataSize();
  if (this.dataSize <= this.maxDataSize) {
    return;
  }

  var message =
    'DelayedStream#maxDataSize of ' + this.maxDataSize + ' bytes exceeded.';
  this._emitError(new Error(message));
};

CombinedStream.prototype._updateDataSize = function() {
  this.dataSize = 0;

  var self = this;
  this._streams.forEach(function(stream) {
    if (!stream.dataSize) {
      return;
    }

    self.dataSize += stream.dataSize;
  });

  if (this._currentStream && this._currentStream.dataSize) {
    this.dataSize += this._currentStream.dataSize;
  }
};

CombinedStream.prototype._emitError = function(err) {
  this._reset();
  this.emit('error', err);
};

}, function(modId) {var map = {}; return __REQUIRE__(map[modId], modId); })
return __REQUIRE__(1662612701763);
})()
//miniprogram-npm-outsideDeps=["util","stream","delayed-stream"]
//# sourceMappingURL=index.js.map