read-excel-file/commonjs/export/convertInputToNodeStream.js

Read `.xlsx` files in a web browser or in Node.js

"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"] = convertInputToNodeStream;
var _fs = _interopRequireDefault(require("fs"));
var _buffer = require("buffer");
var _stream = _interopRequireWildcard(require("stream"));
function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
/**
 * Converts Node.js input argument to a stream.
 * @param  {(string|Stream|Buffer|Blob)} input - A Node.js readable stream or a `Buffer` or a `Blob` or a path to a file.
 * @returns {Stream}
 */
function convertInputToNodeStream(input) {
  return input instanceof _stream["default"] ? input : input instanceof Buffer ? createReadableStreamFromBuffer(input) : input instanceof _buffer.Blob ? createReadableStreamFromBlob(input) : _fs["default"].createReadStream(input);
}

// Creates a readable stream from a `Buffer`.
function createReadableStreamFromBuffer(buffer) {
  // Node.js seems to have a bug in `Readable.from()` function:
  // it doesn't correctly handle empty buffers, i.e. it doesn't return a correct stream.
  // https://gitlab.com/catamphetamine/read-excel-file/-/issues/106
  if (buffer.length === 0) {
    throw new Error('No data');
  }
  return _stream.Readable.from(buffer);
}

// Creates a readable stream from a `Blob`.
function createReadableStreamFromBlob(blob) {
  // I didn't test but I'd presume that Node.js would throw on an empty `Blob`
  // same way it does on an empty `Buffer`.
  // https://gitlab.com/catamphetamine/read-excel-file/-/issues/106
  if (blob.size === 0) {
    throw new Error('No data');
  }
  // Convert a web `ReadableStream` to a Node.js `Readable` `Stream`.
  return _stream.Readable.fromWeb(blob.stream());
}
//# sourceMappingURL=convertInputToNodeStream.js.map