unzipper-esm/dist/DuplexStream.js

Unzip cross-platform streaming API

"use strict";

function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var _stream = require("stream");
function _classCallCheck(a, n) { if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function"); }
function _defineProperties(e, r) { for (var t = 0; t < r.length; t++) { var o = r[t]; o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, _toPropertyKey(o.key), o); } }
function _createClass(e, r, t) { return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", { writable: !1 }), e; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
function _callSuper(t, o, e) { return o = _getPrototypeOf(o), _possibleConstructorReturn(t, _isNativeReflectConstruct() ? Reflect.construct(o, e || [], _getPrototypeOf(t).constructor) : o.apply(t, e)); }
function _possibleConstructorReturn(t, e) { if (e && ("object" == _typeof(e) || "function" == typeof e)) return e; if (void 0 !== e) throw new TypeError("Derived constructors may only return object or undefined"); return _assertThisInitialized(t); }
function _assertThisInitialized(e) { if (void 0 === e) throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); return e; }
function _isNativeReflectConstruct() { try { var t = !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); } catch (t) {} return (_isNativeReflectConstruct = function _isNativeReflectConstruct() { return !!t; })(); }
function _getPrototypeOf(t) { return _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf.bind() : function (t) { return t.__proto__ || Object.getPrototypeOf(t); }, _getPrototypeOf(t); }
function _inherits(t, e) { if ("function" != typeof e && null !== e) throw new TypeError("Super expression must either be null or a function"); t.prototype = Object.create(e && e.prototype, { constructor: { value: t, writable: !0, configurable: !0 } }), Object.defineProperty(t, "prototype", { writable: !1 }), e && _setPrototypeOf(t, e); }
function _setPrototypeOf(t, e) { return _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function (t, e) { return t.__proto__ = e, t; }, _setPrototypeOf(t, e); } // Copy-pasted from `duplexer3` source code on Jun 19th, 2026:
// https://github.com/sindresorhus/duplexer3/blob/main/index.js
//
// Reasons:
//
// * `duplexer3` doesn't provide CommonJS exports,
//    so it won't work in a CommonJS-only environment:
//    https://gitlab.com/catamphetamine/read-excel-file/-/work_items/113
//
// * `duplexer3` prefixes Node.js "native" modules with "node:" prefix.
//    The "node:" protocol prefix for built-in modules has been supported
//    in Node.js since versions `v14.13.1` and `v12.20.0` for ECMAScript modules (`import`).
//    Support for CommonJS (`require()`) followed later in versions `v16.0.0` and `v14.18.0`.
//    Because `unzipper` supports Node.js >= 8, `unzipper-esm` has to meet that baseline,
//    so it doesn't use the "node:" protocol prefix.
//
// * Code style
//   * Changed the `import` from `import stream from "stream"` to a named import of `Duplex` class.
//   * Changed `DuplexWrapper` from a "prototypal inheritance function" to a proper class.
//   * Changed the arguments from `(options, writable, readable)` to `(writable, readable, options)`.
//   * Replaced the default exported function with a default exported class.
//   * Removed `new Readable(options).wrap(readable)` conversion because there's no need to
//     support legacy Node.js < 0.10 streams.
//
// 'node:stream'
var DuplexStream = exports["default"] = /*#__PURE__*/function (_Duplex) {
  /**
   * Creates a combined "duplex" stream from a separate writable stream and a separate readable stream.
   * Whenever data is written to the "duplex" stream, it gets written to the writable stream.
   * Whenever data is read from the "duplex" stream, it gets read from the readable stream.
   * @param {Writable} writable — Writable stream.
   * @param {Readable} readable — Readable stream.
   * @param {object} options — Node.js `Duplex` stream options, plus an additional `boolean` option called `bubbleErrors` which could be set to `false` to not "bubble" errors from `readable` or `writable` stream to the resulting "duplex" stream (`bubbleErrors` is `true` by default).
   */
  function DuplexStream(writable, readable, options) {
    var _this;
    _classCallCheck(this, DuplexStream);
    _this = _callSuper(this, DuplexStream, [options]);
    _this._writable = writable;
    _this._readable = readable;
    _this._waiting = false;
    writable.once('finish', function () {
      _this.end();
    });
    _this.once('finish', function () {
      writable.end();
    });
    readable.on('readable', function () {
      if (_this._waiting) {
        _this._waiting = false;
        _this._read();
      }
    });
    readable.once('end', function () {
      _this.push(null);
    });
    if (!options || typeof options.bubbleErrors === 'undefined' || options.bubbleErrors) {
      writable.on('error', function (error) {
        _this.emit('error', error);
      });
      readable.on('error', function (error) {
        _this.emit('error', error);
      });
    }
    return _this;
  }
  _inherits(DuplexStream, _Duplex);
  return _createClass(DuplexStream, [{
    key: "_write",
    value: function _write(input, encoding, done) {
      this._writable.write(input, encoding, done);
    }
  }, {
    key: "_read",
    value: function _read() {
      var buffer;
      var readCount = 0;
      while ((buffer = this._readable.read()) !== null) {
        this.push(buffer);
        readCount++;
      }
      if (readCount === 0) {
        this._waiting = true;
      }
    }
  }]);
}(_stream.Duplex);
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