first commit

node_modules/formidable/src/Formidable.js

@@ -0,0 +1,617 @@
+/* eslint-disable class-methods-use-this */
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const os = require('os');
+const path = require('path');
+const hexoid = require('hexoid');
+const once = require('once');
+const dezalgo = require('dezalgo');
+const { EventEmitter } = require('events');
+const { StringDecoder } = require('string_decoder');
+const qs = require('qs');
+
+const toHexoId = hexoid(25);
+const DEFAULT_OPTIONS = {
+  maxFields: 1000,
+  maxFieldsSize: 20 * 1024 * 1024,
+  maxFileSize: 200 * 1024 * 1024,
+  minFileSize: 1,
+  allowEmptyFiles: true,
+  keepExtensions: false,
+  encoding: 'utf-8',
+  hashAlgorithm: false,
+  uploadDir: os.tmpdir(),
+  multiples: false,
+  enabledPlugins: ['octetstream', 'querystring', 'multipart', 'json'],
+  fileWriteStreamHandler: null,
+  defaultInvalidName: 'invalid-name',
+  filter: function () {
+    return true;
+  },
+};
+
+const PersistentFile = require('./PersistentFile');
+const VolatileFile = require('./VolatileFile');
+const DummyParser = require('./parsers/Dummy');
+const MultipartParser = require('./parsers/Multipart');
+const errors = require('./FormidableError.js');
+
+const { FormidableError } = errors;
+
+function hasOwnProp(obj, key) {
+  return Object.prototype.hasOwnProperty.call(obj, key);
+}
+
+class IncomingForm extends EventEmitter {
+  constructor(options = {}) {
+    super();
+
+    this.options = { ...DEFAULT_OPTIONS, ...options };
+
+    const dir = path.resolve(
+      this.options.uploadDir || this.options.uploaddir || os.tmpdir(),
+    );
+
+    this.uploaddir = dir;
+    this.uploadDir = dir;
+
+    // initialize with null
+    [
+      'error',
+      'headers',
+      'type',
+      'bytesExpected',
+      'bytesReceived',
+      '_parser',
+    ].forEach((key) => {
+      this[key] = null;
+    });
+
+    this._setUpRename();
+
+    this._flushing = 0;
+    this._fieldsSize = 0;
+    this._fileSize = 0;
+    this._plugins = [];
+    this.openedFiles = [];
+
+    this.options.enabledPlugins = []
+      .concat(this.options.enabledPlugins)
+      .filter(Boolean);
+
+    if (this.options.enabledPlugins.length === 0) {
+      throw new FormidableError(
+        'expect at least 1 enabled builtin plugin, see options.enabledPlugins',
+        errors.missingPlugin,
+      );
+    }
+
+    this.options.enabledPlugins.forEach((pluginName) => {
+      const plgName = pluginName.toLowerCase();
+      // eslint-disable-next-line import/no-dynamic-require, global-require
+      this.use(require(path.join(__dirname, 'plugins', `${plgName}.js`)));
+    });
+
+    this._setUpMaxFields();
+  }
+
+  use(plugin) {
+    if (typeof plugin !== 'function') {
+      throw new FormidableError(
+        '.use: expect `plugin` to be a function',
+        errors.pluginFunction,
+      );
+    }
+    this._plugins.push(plugin.bind(this));
+    return this;
+  }
+
+  parse(req, cb) {
+    this.pause = () => {
+      try {
+        req.pause();
+      } catch (err) {
+        // the stream was destroyed
+        if (!this.ended) {
+          // before it was completed, crash & burn
+          this._error(err);
+        }
+        return false;
+      }
+      return true;
+    };
+
+    this.resume = () => {
+      try {
+        req.resume();
+      } catch (err) {
+        // the stream was destroyed
+        if (!this.ended) {
+          // before it was completed, crash & burn
+          this._error(err);
+        }
+        return false;
+      }
+
+      return true;
+    };
+
+    // Setup callback first, so we don't miss anything from data events emitted immediately.
+    if (cb) {
+      const callback = once(dezalgo(cb));
+      const fields = {};
+      let mockFields = '';
+      const files = {};
+
+      this.on('field', (name, value) => {
+        if (
+          this.options.multiples &&
+          (this.type === 'multipart' || this.type === 'urlencoded')
+        ) {
+          const mObj = { [name]: value };
+          mockFields = mockFields
+            ? `${mockFields}&${qs.stringify(mObj)}`
+            : `${qs.stringify(mObj)}`;
+        } else {
+          fields[name] = value;
+        }
+      });
+      this.on('file', (name, file) => {
+        // TODO: too much nesting
+        if (this.options.multiples) {
+          if (hasOwnProp(files, name)) {
+            if (!Array.isArray(files[name])) {
+              files[name] = [files[name]];
+            }
+            files[name].push(file);
+          } else {
+            files[name] = file;
+          }
+        } else {
+          files[name] = file;
+        }
+      });
+      this.on('error', (err) => {
+        callback(err, fields, files);
+      });
+      this.on('end', () => {
+        if (this.options.multiples) {
+          Object.assign(fields, qs.parse(mockFields));
+        }
+        callback(null, fields, files);
+      });
+    }
+
+    // Parse headers and setup the parser, ready to start listening for data.
+    this.writeHeaders(req.headers);
+
+    // Start listening for data.
+    req
+      .on('error', (err) => {
+        this._error(err);
+      })
+      .on('aborted', () => {
+        this.emit('aborted');
+        this._error(new FormidableError('Request aborted', errors.aborted));
+      })
+      .on('data', (buffer) => {
+        try {
+          this.write(buffer);
+        } catch (err) {
+          this._error(err);
+        }
+      })
+      .on('end', () => {
+        if (this.error) {
+          return;
+        }
+        if (this._parser) {
+          this._parser.end();
+        }
+        this._maybeEnd();
+      });
+
+    return this;
+  }
+
+  writeHeaders(headers) {
+    this.headers = headers;
+    this._parseContentLength();
+    this._parseContentType();
+
+    if (!this._parser) {
+      this._error(
+        new FormidableError(
+          'no parser found',
+          errors.noParser,
+          415, // Unsupported Media Type
+        ),
+      );
+      return;
+    }
+
+    this._parser.once('error', (error) => {
+      this._error(error);
+    });
+  }
+
+  write(buffer) {
+    if (this.error) {
+      return null;
+    }
+    if (!this._parser) {
+      this._error(
+        new FormidableError('uninitialized parser', errors.uninitializedParser),
+      );
+      return null;
+    }
+
+    this.bytesReceived += buffer.length;
+    this.emit('progress', this.bytesReceived, this.bytesExpected);
+
+    this._parser.write(buffer);
+
+    return this.bytesReceived;
+  }
+
+  pause() {
+    // this does nothing, unless overwritten in IncomingForm.parse
+    return false;
+  }
+
+  resume() {
+    // this does nothing, unless overwritten in IncomingForm.parse
+    return false;
+  }
+
+  onPart(part) {
+    // this method can be overwritten by the user
+    this._handlePart(part);
+  }
+
+  _handlePart(part) {
+    if (part.originalFilename && typeof part.originalFilename !== 'string') {
+      this._error(
+        new FormidableError(
+          `the part.originalFilename should be string when it exists`,
+          errors.filenameNotString,
+        ),
+      );
+      return;
+    }
+
+    // This MUST check exactly for undefined. You can not change it to !part.originalFilename.
+
+    // todo: uncomment when switch tests to Jest
+    // console.log(part);
+
+    // ? NOTE(@tunnckocore): no it can be any falsey value, it most probably depends on what's returned
+    // from somewhere else. Where recently I changed the return statements
+    // and such thing because code style
+    // ? NOTE(@tunnckocore): or even better, if there is no mimetype, then it's for sure a field
+    // ? NOTE(@tunnckocore): originalFilename is an empty string when a field?
+    if (!part.mimetype) {
+      let value = '';
+      const decoder = new StringDecoder(
+        part.transferEncoding || this.options.encoding,
+      );
+
+      part.on('data', (buffer) => {
+        this._fieldsSize += buffer.length;
+        if (this._fieldsSize > this.options.maxFieldsSize) {
+          this._error(
+            new FormidableError(
+              `options.maxFieldsSize (${this.options.maxFieldsSize} bytes) exceeded, received ${this._fieldsSize} bytes of field data`,
+              errors.maxFieldsSizeExceeded,
+              413, // Payload Too Large
+            ),
+          );
+          return;
+        }
+        value += decoder.write(buffer);
+      });
+
+      part.on('end', () => {
+        this.emit('field', part.name, value);
+      });
+      return;
+    }
+
+    if (!this.options.filter(part)) {
+      return;
+    }
+
+    this._flushing += 1;
+
+    const newFilename = this._getNewName(part);
+    const filepath = this._joinDirectoryName(newFilename);
+    const file = this._newFile({
+      newFilename,
+      filepath,
+      originalFilename: part.originalFilename,
+      mimetype: part.mimetype,
+    });
+    file.on('error', (err) => {
+      this._error(err);
+    });
+    this.emit('fileBegin', part.name, file);
+
+    file.open();
+    this.openedFiles.push(file);
+
+    part.on('data', (buffer) => {
+      this._fileSize += buffer.length;
+      if (this._fileSize < this.options.minFileSize) {
+        this._error(
+          new FormidableError(
+            `options.minFileSize (${this.options.minFileSize} bytes) inferior, received ${this._fileSize} bytes of file data`,
+            errors.smallerThanMinFileSize,
+            400,
+          ),
+        );
+        return;
+      }
+      if (this._fileSize > this.options.maxFileSize) {
+        this._error(
+          new FormidableError(
+            `options.maxFileSize (${this.options.maxFileSize} bytes) exceeded, received ${this._fileSize} bytes of file data`,
+            errors.biggerThanMaxFileSize,
+            413,
+          ),
+        );
+        return;
+      }
+      if (buffer.length === 0) {
+        return;
+      }
+      this.pause();
+      file.write(buffer, () => {
+        this.resume();
+      });
+    });
+
+    part.on('end', () => {
+      if (!this.options.allowEmptyFiles && this._fileSize === 0) {
+        this._error(
+          new FormidableError(
+            `options.allowEmptyFiles is false, file size should be greather than 0`,
+            errors.noEmptyFiles,
+            400,
+          ),
+        );
+        return;
+      }
+
+      file.end(() => {
+        this._flushing -= 1;
+        this.emit('file', part.name, file);
+        this._maybeEnd();
+      });
+    });
+  }
+
+  // eslint-disable-next-line max-statements
+  _parseContentType() {
+    if (this.bytesExpected === 0) {
+      this._parser = new DummyParser(this, this.options);
+      return;
+    }
+
+    if (!this.headers['content-type']) {
+      this._error(
+        new FormidableError(
+          'bad content-type header, no content-type',
+          errors.missingContentType,
+          400,
+        ),
+      );
+      return;
+    }
+
+    const results = [];
+    const _dummyParser = new DummyParser(this, this.options);
+
+    // eslint-disable-next-line no-plusplus
+    for (let idx = 0; idx < this._plugins.length; idx++) {
+      const plugin = this._plugins[idx];
+
+      let pluginReturn = null;
+
+      try {
+        pluginReturn = plugin(this, this.options) || this;
+      } catch (err) {
+        // directly throw from the `form.parse` method;
+        // there is no other better way, except a handle through options
+        const error = new FormidableError(
+          `plugin on index ${idx} failed with: ${err.message}`,
+          errors.pluginFailed,
+          500,
+        );
+        error.idx = idx;
+        throw error;
+      }
+
+      Object.assign(this, pluginReturn);
+
+      // todo: use Set/Map and pass plugin name instead of the `idx` index
+      this.emit('plugin', idx, pluginReturn);
+      results.push(pluginReturn);
+    }
+
+    this.emit('pluginsResults', results);
+
+    // NOTE: probably not needed, because we check options.enabledPlugins in the constructor
+    // if (results.length === 0 /* && results.length !== this._plugins.length */) {
+    //   this._error(
+    //     new Error(
+    //       `bad content-type header, unknown content-type: ${this.headers['content-type']}`,
+    //     ),
+    //   );
+    // }
+  }
+
+  _error(err, eventName = 'error') {
+    // if (!err && this.error) {
+    //   this.emit('error', this.error);
+    //   return;
+    // }
+    if (this.error || this.ended) {
+      return;
+    }
+
+    this.error = err;
+    this.emit(eventName, err);
+
+    if (Array.isArray(this.openedFiles)) {
+      this.openedFiles.forEach((file) => {
+        file.destroy();
+      });
+    }
+  }
+
+  _parseContentLength() {
+    this.bytesReceived = 0;
+    if (this.headers['content-length']) {
+      this.bytesExpected = parseInt(this.headers['content-length'], 10);
+    } else if (this.headers['transfer-encoding'] === undefined) {
+      this.bytesExpected = 0;
+    }
+
+    if (this.bytesExpected !== null) {
+      this.emit('progress', this.bytesReceived, this.bytesExpected);
+    }
+  }
+
+  _newParser() {
+    return new MultipartParser(this.options);
+  }
+
+  _newFile({ filepath, originalFilename, mimetype, newFilename }) {
+    return this.options.fileWriteStreamHandler
+      ? new VolatileFile({
+          newFilename,
+          filepath,
+          originalFilename,
+          mimetype,
+          createFileWriteStream: this.options.fileWriteStreamHandler,
+          hashAlgorithm: this.options.hashAlgorithm,
+        })
+      : new PersistentFile({
+          newFilename,
+          filepath,
+          originalFilename,
+          mimetype,
+          hashAlgorithm: this.options.hashAlgorithm,
+        });
+  }
+
+  _getFileName(headerValue) {
+    // matches either a quoted-string or a token (RFC 2616 section 19.5.1)
+    const m = headerValue.match(
+      /\bfilename=("(.*?)"|([^()<>{}[\]@,;:"?=\s/\t]+))($|;\s)/i,
+    );
+    if (!m) return null;
+
+    const match = m[2] || m[3] || '';
+    let originalFilename = match.substr(match.lastIndexOf('\\') + 1);
+    originalFilename = originalFilename.replace(/%22/g, '"');
+    originalFilename = originalFilename.replace(/&#([\d]{4});/g, (_, code) =>
+      String.fromCharCode(code),
+    );
+
+    return originalFilename;
+  }
+
+  _getExtension(str) {
+    if (!str) {
+      return '';
+    }
+
+    const basename = path.basename(str);
+    const firstDot = basename.indexOf('.');
+    const lastDot = basename.lastIndexOf('.');
+    const extname = path.extname(basename).replace(/(\.[a-z0-9]+).*/i, '$1');
+
+    if (firstDot === lastDot) {
+      return extname;
+    }
+
+    return basename.slice(firstDot, lastDot) + extname;
+  }
+
+
+
+  _joinDirectoryName(name) {
+    const newPath = path.join(this.uploadDir, name);
+
+    // prevent directory traversal attacks
+    if (!newPath.startsWith(this.uploadDir)) {
+      return path.join(this.uploadDir, this.options.defaultInvalidName);
+    }
+
+    return newPath;
+  }
+
+  _setUpRename() {
+    const hasRename = typeof this.options.filename === 'function';
+    if (hasRename) {
+      this._getNewName = (part) => {
+        let ext = '';
+        let name = this.options.defaultInvalidName;
+        if (part.originalFilename) {
+          // can be null
+          ({ ext, name } = path.parse(part.originalFilename));
+          if (this.options.keepExtensions !== true) {
+            ext = '';
+          }
+        }
+        return this.options.filename.call(this, name, ext, part, this);
+      };
+    } else {
+      this._getNewName = (part) => {
+        const name = toHexoId();
+
+        if (part && this.options.keepExtensions) {
+          const originalFilename = typeof part === 'string' ? part : part.originalFilename;
+          return `${name}${this._getExtension(originalFilename)}`;
+        }
+    
+        return name;
+      }
+    }
+  }
+
+  _setUpMaxFields() {
+    if (this.options.maxFields !== 0) {
+      let fieldsCount = 0;
+      this.on('field', () => {
+        fieldsCount += 1;
+        if (fieldsCount > this.options.maxFields) {
+          this._error(
+            new FormidableError(
+              `options.maxFields (${this.options.maxFields}) exceeded`,
+              errors.maxFieldsExceeded,
+              413,
+            ),
+          );
+        }
+      });
+    }
+  }
+
+  _maybeEnd() {
+    // console.log('ended', this.ended);
+    // console.log('_flushing', this._flushing);
+    // console.log('error', this.error);
+    if (!this.ended || this._flushing || this.error) {
+      return;
+    }
+
+    this.emit('end');
+  }
+}
+
+IncomingForm.DEFAULT_OPTIONS = DEFAULT_OPTIONS;
+module.exports = IncomingForm;

node_modules/formidable/src/FormidableError.js

@@ -0,0 +1,45 @@
+/* eslint-disable no-plusplus */
+
+const missingPlugin = 1000;
+const pluginFunction = 1001;
+const aborted = 1002;
+const noParser = 1003;
+const uninitializedParser = 1004;
+const filenameNotString = 1005;
+const maxFieldsSizeExceeded = 1006;
+const maxFieldsExceeded = 1007;
+const smallerThanMinFileSize = 1008;
+const biggerThanMaxFileSize = 1009;
+const noEmptyFiles = 1010;
+const missingContentType = 1011;
+const malformedMultipart = 1012;
+const missingMultipartBoundary = 1013;
+const unknownTransferEncoding = 1014;
+
+const FormidableError = class extends Error {
+  constructor(message, internalCode, httpCode = 500) {
+    super(message);
+    this.code = internalCode;
+    this.httpCode = httpCode;
+  }
+};
+
+module.exports = {
+  missingPlugin,
+  pluginFunction,
+  aborted,
+  noParser,
+  uninitializedParser,
+  filenameNotString,
+  maxFieldsSizeExceeded,
+  maxFieldsExceeded,
+  smallerThanMinFileSize,
+  biggerThanMaxFileSize,
+  noEmptyFiles,
+  missingContentType,
+  malformedMultipart,
+  missingMultipartBoundary,
+  unknownTransferEncoding,
+
+  FormidableError,
+};

node_modules/formidable/src/PersistentFile.js

@@ -0,0 +1,87 @@
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const fs = require('fs');
+const crypto = require('crypto');
+const { EventEmitter } = require('events');
+
+class PersistentFile extends EventEmitter {
+  constructor({ filepath, newFilename, originalFilename, mimetype, hashAlgorithm }) {
+    super();
+
+    this.lastModifiedDate = null;
+    Object.assign(this, { filepath, newFilename, originalFilename, mimetype, hashAlgorithm });
+
+    this.size = 0;
+    this._writeStream = null;
+
+    if (typeof this.hashAlgorithm === 'string') {
+      this.hash = crypto.createHash(this.hashAlgorithm);
+    } else {
+      this.hash = null;
+    }
+  }
+
+  open() {
+    this._writeStream = new fs.WriteStream(this.filepath);
+    this._writeStream.on('error', (err) => {
+      this.emit('error', err);
+    });
+  }
+
+  toJSON() {
+    const json = {
+      size: this.size,
+      filepath: this.filepath,
+      newFilename: this.newFilename,
+      mimetype: this.mimetype,
+      mtime: this.lastModifiedDate,
+      length: this.length,
+      originalFilename: this.originalFilename,
+    };
+    if (this.hash && this.hash !== '') {
+      json.hash = this.hash;
+    }
+    return json;
+  }
+
+  toString() {
+    return `PersistentFile: ${this._file.newFilename}, Original: ${this._file.originalFilename}, Path: ${this._file.filepath}`;
+  }
+
+  write(buffer, cb) {
+    if (this.hash) {
+      this.hash.update(buffer);
+    }
+
+    if (this._writeStream.closed) {
+      cb();
+      return;
+    }
+
+    this._writeStream.write(buffer, () => {
+      this.lastModifiedDate = new Date();
+      this.size += buffer.length;
+      this.emit('progress', this.size);
+      cb();
+    });
+  }
+
+  end(cb) {
+    if (this.hash) {
+      this.hash = this.hash.digest('hex');
+    }
+    this._writeStream.end(() => {
+      this.emit('end');
+      cb();
+    });
+  }
+
+  destroy() {
+    this._writeStream.destroy();
+    fs.unlink(this.filepath, () => {});
+  }
+}
+
+module.exports = PersistentFile;

node_modules/formidable/src/VolatileFile.js

@@ -0,0 +1,82 @@
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const crypto = require('crypto');
+const { EventEmitter } = require('events');
+
+class VolatileFile extends EventEmitter {
+  constructor({ filepath, newFilename, originalFilename, mimetype, hashAlgorithm, createFileWriteStream }) {
+    super();
+
+    this.lastModifiedDate = null;
+    Object.assign(this, { filepath, newFilename, originalFilename, mimetype, hashAlgorithm, createFileWriteStream });
+
+    this.size = 0;
+    this._writeStream = null;
+
+    if (typeof this.hashAlgorithm === 'string') {
+      this.hash = crypto.createHash(this.hashAlgorithm);
+    } else {
+      this.hash = null;
+    }
+  }
+
+  open() {
+    this._writeStream = this.createFileWriteStream(this);
+    this._writeStream.on('error', (err) => {
+      this.emit('error', err);
+    });
+  }
+
+  destroy() {
+    this._writeStream.destroy();
+  }
+
+  toJSON() {
+    const json = {
+      size: this.size,
+      newFilename: this.newFilename,
+      length: this.length,
+      originalFilename: this.originalFilename,
+      mimetype: this.mimetype,
+    };
+    if (this.hash && this.hash !== '') {
+      json.hash = this.hash;
+    }
+    return json;
+  }
+
+  toString() {
+    return `VolatileFile: ${this.originalFilename}`;
+  }
+
+  write(buffer, cb) {
+    if (this.hash) {
+      this.hash.update(buffer);
+    }
+
+    if (this._writeStream.closed || this._writeStream.destroyed) {
+      cb();
+      return;
+    }
+
+    this._writeStream.write(buffer, () => {
+      this.size += buffer.length;
+      this.emit('progress', this.size);
+      cb();
+    });
+  }
+
+  end(cb) {
+    if (this.hash) {
+      this.hash = this.hash.digest('hex');
+    }
+    this._writeStream.end(() => {
+      this.emit('end');
+      cb();
+    });
+  }
+}
+
+module.exports = VolatileFile;

node_modules/formidable/src/index.js

@@ -0,0 +1,38 @@
+'use strict';
+
+const PersistentFile = require('./PersistentFile');
+const VolatileFile = require('./VolatileFile');
+const Formidable = require('./Formidable');
+const FormidableError = require('./FormidableError');
+
+const plugins = require('./plugins/index');
+const parsers = require('./parsers/index');
+
+// make it available without requiring the `new` keyword
+// if you want it access `const formidable.IncomingForm` as v1
+const formidable = (...args) => new Formidable(...args);
+
+module.exports = Object.assign(formidable, {
+  errors: FormidableError,
+  File: PersistentFile,
+  PersistentFile,
+  VolatileFile,
+  Formidable,
+  formidable,
+
+  // alias
+  IncomingForm: Formidable,
+
+  // parsers
+  ...parsers,
+  parsers,
+
+  // misc
+  defaultOptions: Formidable.DEFAULT_OPTIONS,
+  enabledPlugins: Formidable.DEFAULT_OPTIONS.enabledPlugins,
+
+  // plugins
+  plugins: {
+    ...plugins,
+  },
+});

node_modules/formidable/src/parsers/Dummy.js

@@ -0,0 +1,21 @@
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const { Transform } = require('stream');
+
+class DummyParser extends Transform {
+  constructor(incomingForm, options = {}) {
+    super();
+    this.globalOptions = { ...options };
+    this.incomingForm = incomingForm;
+  }
+
+  _flush(callback) {
+    this.incomingForm.ended = true;
+    this.incomingForm._maybeEnd();
+    callback();
+  }
+}
+
+module.exports = DummyParser;

node_modules/formidable/src/parsers/JSON.js

@@ -0,0 +1,35 @@
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const { Transform } = require('stream');
+
+class JSONParser extends Transform {
+  constructor(options = {}) {
+    super({ readableObjectMode: true });
+    this.chunks = [];
+    this.globalOptions = { ...options };
+  }
+
+  _transform(chunk, encoding, callback) {
+    this.chunks.push(String(chunk)); // todo consider using a string decoder
+    callback();
+  }
+
+  _flush(callback) {
+    try {
+      const fields = JSON.parse(this.chunks.join(''));
+      Object.keys(fields).forEach((key) => {
+        const value = fields[key];
+        this.push({ key, value });
+      });
+    } catch (e) {
+      callback(e);
+      return;
+    }
+    this.chunks = null;
+    callback();
+  }
+}
+
+module.exports = JSONParser;

node_modules/formidable/src/parsers/Multipart.js

@@ -0,0 +1,347 @@
+/* eslint-disable no-fallthrough */
+/* eslint-disable no-bitwise */
+/* eslint-disable no-plusplus */
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const { Transform } = require('stream');
+const errors = require('../FormidableError.js');
+
+const { FormidableError } = errors;
+
+let s = 0;
+const STATE = {
+  PARSER_UNINITIALIZED: s++,
+  START: s++,
+  START_BOUNDARY: s++,
+  HEADER_FIELD_START: s++,
+  HEADER_FIELD: s++,
+  HEADER_VALUE_START: s++,
+  HEADER_VALUE: s++,
+  HEADER_VALUE_ALMOST_DONE: s++,
+  HEADERS_ALMOST_DONE: s++,
+  PART_DATA_START: s++,
+  PART_DATA: s++,
+  PART_END: s++,
+  END: s++,
+};
+
+let f = 1;
+const FBOUNDARY = { PART_BOUNDARY: f, LAST_BOUNDARY: (f *= 2) };
+
+const LF = 10;
+const CR = 13;
+const SPACE = 32;
+const HYPHEN = 45;
+const COLON = 58;
+const A = 97;
+const Z = 122;
+
+function lower(c) {
+  return c | 0x20;
+}
+
+exports.STATES = {};
+
+Object.keys(STATE).forEach((stateName) => {
+  exports.STATES[stateName] = STATE[stateName];
+});
+
+class MultipartParser extends Transform {
+  constructor(options = {}) {
+    super({ readableObjectMode: true });
+    this.boundary = null;
+    this.boundaryChars = null;
+    this.lookbehind = null;
+    this.bufferLength = 0;
+    this.state = STATE.PARSER_UNINITIALIZED;
+
+    this.globalOptions = { ...options };
+    this.index = null;
+    this.flags = 0;
+  }
+
+  _flush(done) {
+    if (
+      (this.state === STATE.HEADER_FIELD_START && this.index === 0) ||
+      (this.state === STATE.PART_DATA && this.index === this.boundary.length)
+    ) {
+      this._handleCallback('partEnd');
+      this._handleCallback('end');
+      done();
+    } else if (this.state !== STATE.END) {
+      done(
+        new FormidableError(
+          `MultipartParser.end(): stream ended unexpectedly: ${this.explain()}`,
+          errors.malformedMultipart,
+          400,
+        ),
+      );
+    }
+  }
+
+  initWithBoundary(str) {
+    this.boundary = Buffer.from(`\r\n--${str}`);
+    this.lookbehind = Buffer.alloc(this.boundary.length + 8);
+    this.state = STATE.START;
+    this.boundaryChars = {};
+
+    for (let i = 0; i < this.boundary.length; i++) {
+      this.boundaryChars[this.boundary[i]] = true;
+    }
+  }
+
+  // eslint-disable-next-line max-params
+  _handleCallback(name, buf, start, end) {
+    if (start !== undefined && start === end) {
+      return;
+    }
+    this.push({ name, buffer: buf, start, end });
+  }
+
+  // eslint-disable-next-line max-statements
+  _transform(buffer, _, done) {
+    let i = 0;
+    let prevIndex = this.index;
+    let { index, state, flags } = this;
+    const { lookbehind, boundary, boundaryChars } = this;
+    const boundaryLength = boundary.length;
+    const boundaryEnd = boundaryLength - 1;
+    this.bufferLength = buffer.length;
+    let c = null;
+    let cl = null;
+
+    const setMark = (name, idx) => {
+      this[`${name}Mark`] = typeof idx === 'number' ? idx : i;
+    };
+
+    const clearMarkSymbol = (name) => {
+      delete this[`${name}Mark`];
+    };
+
+    const dataCallback = (name, shouldClear) => {
+      const markSymbol = `${name}Mark`;
+      if (!(markSymbol in this)) {
+        return;
+      }
+
+      if (!shouldClear) {
+        this._handleCallback(name, buffer, this[markSymbol], buffer.length);
+        setMark(name, 0);
+      } else {
+        this._handleCallback(name, buffer, this[markSymbol], i);
+        clearMarkSymbol(name);
+      }
+    };
+
+    for (i = 0; i < this.bufferLength; i++) {
+      c = buffer[i];
+      switch (state) {
+        case STATE.PARSER_UNINITIALIZED:
+          return i;
+        case STATE.START:
+          index = 0;
+          state = STATE.START_BOUNDARY;
+        case STATE.START_BOUNDARY:
+          if (index === boundary.length - 2) {
+            if (c === HYPHEN) {
+              flags |= FBOUNDARY.LAST_BOUNDARY;
+            } else if (c !== CR) {
+              return i;
+            }
+            index++;
+            break;
+          } else if (index - 1 === boundary.length - 2) {
+            if (flags & FBOUNDARY.LAST_BOUNDARY && c === HYPHEN) {
+              this._handleCallback('end');
+              state = STATE.END;
+              flags = 0;
+            } else if (!(flags & FBOUNDARY.LAST_BOUNDARY) && c === LF) {
+              index = 0;
+              this._handleCallback('partBegin');
+              state = STATE.HEADER_FIELD_START;
+            } else {
+              return i;
+            }
+            break;
+          }
+
+          if (c !== boundary[index + 2]) {
+            index = -2;
+          }
+          if (c === boundary[index + 2]) {
+            index++;
+          }
+          break;
+        case STATE.HEADER_FIELD_START:
+          state = STATE.HEADER_FIELD;
+          setMark('headerField');
+          index = 0;
+        case STATE.HEADER_FIELD:
+          if (c === CR) {
+            clearMarkSymbol('headerField');
+            state = STATE.HEADERS_ALMOST_DONE;
+            break;
+          }
+
+          index++;
+          if (c === HYPHEN) {
+            break;
+          }
+
+          if (c === COLON) {
+            if (index === 1) {
+              // empty header field
+              return i;
+            }
+            dataCallback('headerField', true);
+            state = STATE.HEADER_VALUE_START;
+            break;
+          }
+
+          cl = lower(c);
+          if (cl < A || cl > Z) {
+            return i;
+          }
+          break;
+        case STATE.HEADER_VALUE_START:
+          if (c === SPACE) {
+            break;
+          }
+
+          setMark('headerValue');
+          state = STATE.HEADER_VALUE;
+        case STATE.HEADER_VALUE:
+          if (c === CR) {
+            dataCallback('headerValue', true);
+            this._handleCallback('headerEnd');
+            state = STATE.HEADER_VALUE_ALMOST_DONE;
+          }
+          break;
+        case STATE.HEADER_VALUE_ALMOST_DONE:
+          if (c !== LF) {
+            return i;
+          }
+          state = STATE.HEADER_FIELD_START;
+          break;
+        case STATE.HEADERS_ALMOST_DONE:
+          if (c !== LF) {
+            return i;
+          }
+
+          this._handleCallback('headersEnd');
+          state = STATE.PART_DATA_START;
+          break;
+        case STATE.PART_DATA_START:
+          state = STATE.PART_DATA;
+          setMark('partData');
+        case STATE.PART_DATA:
+          prevIndex = index;
+
+          if (index === 0) {
+            // boyer-moore derrived algorithm to safely skip non-boundary data
+            i += boundaryEnd;
+            while (i < this.bufferLength && !(buffer[i] in boundaryChars)) {
+              i += boundaryLength;
+            }
+            i -= boundaryEnd;
+            c = buffer[i];
+          }
+
+          if (index < boundary.length) {
+            if (boundary[index] === c) {
+              if (index === 0) {
+                dataCallback('partData', true);
+              }
+              index++;
+            } else {
+              index = 0;
+            }
+          } else if (index === boundary.length) {
+            index++;
+            if (c === CR) {
+              // CR = part boundary
+              flags |= FBOUNDARY.PART_BOUNDARY;
+            } else if (c === HYPHEN) {
+              // HYPHEN = end boundary
+              flags |= FBOUNDARY.LAST_BOUNDARY;
+            } else {
+              index = 0;
+            }
+          } else if (index - 1 === boundary.length) {
+            if (flags & FBOUNDARY.PART_BOUNDARY) {
+              index = 0;
+              if (c === LF) {
+                // unset the PART_BOUNDARY flag
+                flags &= ~FBOUNDARY.PART_BOUNDARY;
+                this._handleCallback('partEnd');
+                this._handleCallback('partBegin');
+                state = STATE.HEADER_FIELD_START;
+                break;
+              }
+            } else if (flags & FBOUNDARY.LAST_BOUNDARY) {
+              if (c === HYPHEN) {
+                this._handleCallback('partEnd');
+                this._handleCallback('end');
+                state = STATE.END;
+                flags = 0;
+              } else {
+                index = 0;
+              }
+            } else {
+              index = 0;
+            }
+          }
+
+          if (index > 0) {
+            // when matching a possible boundary, keep a lookbehind reference
+            // in case it turns out to be a false lead
+            lookbehind[index - 1] = c;
+          } else if (prevIndex > 0) {
+            // if our boundary turned out to be rubbish, the captured lookbehind
+            // belongs to partData
+            this._handleCallback('partData', lookbehind, 0, prevIndex);
+            prevIndex = 0;
+            setMark('partData');
+
+            // reconsider the current character even so it interrupted the sequence
+            // it could be the beginning of a new sequence
+            i--;
+          }
+
+          break;
+        case STATE.END:
+          break;
+        default:
+          return i;
+      }
+    }
+
+    dataCallback('headerField');
+    dataCallback('headerValue');
+    dataCallback('partData');
+
+    this.index = index;
+    this.state = state;
+    this.flags = flags;
+
+    done();
+    return this.bufferLength;
+  }
+
+  explain() {
+    return `state = ${MultipartParser.stateToString(this.state)}`;
+  }
+}
+
+// eslint-disable-next-line consistent-return
+MultipartParser.stateToString = (stateNumber) => {
+  // eslint-disable-next-line no-restricted-syntax, guard-for-in
+  for (const stateName in STATE) {
+    const number = STATE[stateName];
+    if (number === stateNumber) return stateName;
+  }
+};
+
+module.exports = Object.assign(MultipartParser, { STATES: exports.STATES });

node_modules/formidable/src/parsers/OctetStream.js

@@ -0,0 +1,12 @@
+'use strict';
+
+const { PassThrough } = require('stream');
+
+class OctetStreamParser extends PassThrough {
+  constructor(options = {}) {
+    super();
+    this.globalOptions = { ...options };
+  }
+}
+
+module.exports = OctetStreamParser;

node_modules/formidable/src/parsers/Querystring.js

@@ -0,0 +1,38 @@
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const { Transform } = require('stream');
+const querystring = require('querystring');
+
+// This is a buffering parser, not quite as nice as the multipart one.
+// If I find time I'll rewrite this to be fully streaming as well
+class QuerystringParser extends Transform {
+  constructor(options = {}) {
+    super({ readableObjectMode: true });
+    this.globalOptions = { ...options };
+    this.buffer = '';
+    this.bufferLength = 0;
+  }
+
+  _transform(buffer, encoding, callback) {
+    this.buffer += buffer.toString('ascii');
+    this.bufferLength = this.buffer.length;
+    callback();
+  }
+
+  _flush(callback) {
+    const fields = querystring.parse(this.buffer, '&', '=');
+    // eslint-disable-next-line no-restricted-syntax, guard-for-in
+    for (const key in fields) {
+      this.push({
+        key,
+        value: fields[key],
+      });
+    }
+    this.buffer = '';
+    callback();
+  }
+}
+
+module.exports = QuerystringParser;

node_modules/formidable/src/parsers/StreamingQuerystring.js

@@ -0,0 +1,121 @@
+// not used
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const { Transform } = require('stream');
+const errors = require('../FormidableError.js');
+
+const { FormidableError } = errors;
+
+const AMPERSAND = 38;
+const EQUALS = 61;
+
+class QuerystringParser extends Transform {
+  constructor(options = {}) {
+    super({ readableObjectMode: true });
+
+    const { maxFieldSize } = options;
+    this.maxFieldLength = maxFieldSize;
+    this.buffer = Buffer.from('');
+    this.fieldCount = 0;
+    this.sectionStart = 0;
+    this.key = '';
+    this.readingKey = true;
+  }
+
+  _transform(buffer, encoding, callback) {
+    let len = buffer.length;
+    if (this.buffer && this.buffer.length) {
+      // we have some data left over from the last write which we are in the middle of processing
+      len += this.buffer.length;
+      buffer = Buffer.concat([this.buffer, buffer], len);
+    }
+
+    for (let i = this.buffer.length || 0; i < len; i += 1) {
+      const c = buffer[i];
+      if (this.readingKey) {
+        // KEY, check for =
+        if (c === EQUALS) {
+          this.key = this.getSection(buffer, i);
+          this.readingKey = false;
+          this.sectionStart = i + 1;
+        } else if (c === AMPERSAND) {
+          // just key, no value. Prepare to read another key
+          this.emitField(this.getSection(buffer, i));
+          this.sectionStart = i + 1;
+        }
+        // VALUE, check for &
+      } else if (c === AMPERSAND) {
+        this.emitField(this.key, this.getSection(buffer, i));
+        this.sectionStart = i + 1;
+      }
+
+      if (
+        this.maxFieldLength &&
+        i - this.sectionStart === this.maxFieldLength
+      ) {
+        callback(
+          new FormidableError(
+            `${
+              this.readingKey ? 'Key' : `Value for ${this.key}`
+            } longer than maxFieldLength`,
+          ),
+          errors.maxFieldsSizeExceeded,
+          413,
+        );
+      }
+    }
+
+    // Prepare the remaining key or value (from sectionStart to the end) for the next write() or for end()
+    len -= this.sectionStart;
+    if (len) {
+      // i.e. Unless the last character was a & or =
+      this.buffer = Buffer.from(this.buffer, 0, this.sectionStart);
+    } else this.buffer = null;
+
+    this.sectionStart = 0;
+    callback();
+  }
+
+  _flush(callback) {
+    // Emit the last field
+    if (this.readingKey) {
+      // we only have a key if there's something in the buffer. We definitely have no value
+        if (this.buffer && this.buffer.length){
+          this.emitField(this.buffer.toString('ascii'));
+        }
+    } else {
+      // We have a key, we may or may not have a value
+      this.emitField(
+        this.key,
+        this.buffer && this.buffer.length && this.buffer.toString('ascii'),
+      );
+    }
+    this.buffer = '';
+    callback();
+  }
+
+  getSection(buffer, i) {
+    if (i === this.sectionStart) return '';
+
+    return buffer.toString('ascii', this.sectionStart, i);
+  }
+
+  emitField(key, val) {
+    this.key = '';
+    this.readingKey = true;
+    this.push({ key, value: val || '' });
+  }
+}
+
+module.exports = QuerystringParser;
+
+// const q = new QuerystringParser({maxFieldSize: 100});
+// (async function() {
+//     for await (const chunk of q) {
+//       console.log(chunk);
+//     }
+// })();
+// q.write("a=b&c=d")
+// q.end()

node_modules/formidable/src/parsers/index.js

@@ -0,0 +1,17 @@
+'use strict';
+
+const JSONParser = require('./JSON');
+const DummyParser = require('./Dummy');
+const MultipartParser = require('./Multipart');
+const OctetStreamParser = require('./OctetStream');
+const QueryStringParser = require('./Querystring');
+
+Object.assign(exports, {
+  JSONParser,
+  DummyParser,
+  MultipartParser,
+  OctetStreamParser,
+  OctetstreamParser: OctetStreamParser,
+  QueryStringParser,
+  QuerystringParser: QueryStringParser,
+});

node_modules/formidable/src/plugins/index.js

@@ -0,0 +1,13 @@
+'use strict';
+
+const octetstream = require('./octetstream');
+const querystring = require('./querystring');
+const multipart = require('./multipart');
+const json = require('./json');
+
+Object.assign(exports, {
+  octetstream,
+  querystring,
+  multipart,
+  json,
+});

node_modules/formidable/src/plugins/json.js

@@ -0,0 +1,38 @@
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const JSONParser = require('../parsers/JSON');
+
+// the `options` is also available through the `this.options` / `formidable.options`
+module.exports = function plugin(formidable, options) {
+  // the `this` context is always formidable, as the first argument of a plugin
+  // but this allows us to customize/test each plugin
+
+  /* istanbul ignore next */
+  const self = this || formidable;
+
+  if (/json/i.test(self.headers['content-type'])) {
+    init.call(self, self, options);
+  }
+};
+
+// Note that it's a good practice (but it's up to you) to use the `this.options` instead
+// of the passed `options` (second) param, because when you decide
+// to test the plugin you can pass custom `this` context to it (and so `this.options`)
+function init(_self, _opts) {
+  this.type = 'json';
+
+  const parser = new JSONParser(this.options);
+
+  parser.on('data', ({ key, value }) => {
+    this.emit('field', key, value);
+  });
+
+  parser.once('end', () => {
+    this.ended = true;
+    this._maybeEnd();
+  });
+
+  this._parser = parser;
+}

node_modules/formidable/src/plugins/multipart.js

@@ -0,0 +1,173 @@
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const { Stream } = require('stream');
+const MultipartParser = require('../parsers/Multipart');
+const errors = require('../FormidableError.js');
+
+const { FormidableError } = errors;
+
+// the `options` is also available through the `options` / `formidable.options`
+module.exports = function plugin(formidable, options) {
+  // the `this` context is always formidable, as the first argument of a plugin
+  // but this allows us to customize/test each plugin
+
+  /* istanbul ignore next */
+  const self = this || formidable;
+
+  // NOTE: we (currently) support both multipart/form-data and multipart/related
+  const multipart = /multipart/i.test(self.headers['content-type']);
+
+  if (multipart) {
+    const m = self.headers['content-type'].match(
+      /boundary=(?:"([^"]+)"|([^;]+))/i,
+    );
+    if (m) {
+      const initMultipart = createInitMultipart(m[1] || m[2]);
+      initMultipart.call(self, self, options); // lgtm [js/superfluous-trailing-arguments]
+    } else {
+      const err = new FormidableError(
+        'bad content-type header, no multipart boundary',
+        errors.missingMultipartBoundary,
+        400,
+      );
+      self._error(err);
+    }
+  }
+};
+
+// Note that it's a good practice (but it's up to you) to use the `this.options` instead
+// of the passed `options` (second) param, because when you decide
+// to test the plugin you can pass custom `this` context to it (and so `this.options`)
+function createInitMultipart(boundary) {
+  return function initMultipart() {
+    this.type = 'multipart';
+
+    const parser = new MultipartParser(this.options);
+    let headerField;
+    let headerValue;
+    let part;
+
+    parser.initWithBoundary(boundary);
+
+    // eslint-disable-next-line max-statements, consistent-return
+    parser.on('data', ({ name, buffer, start, end }) => {
+      if (name === 'partBegin') {
+        part = new Stream();
+        part.readable = true;
+        part.headers = {};
+        part.name = null;
+        part.originalFilename = null;
+        part.mimetype = null;
+
+        part.transferEncoding = this.options.encoding;
+        part.transferBuffer = '';
+
+        headerField = '';
+        headerValue = '';
+      } else if (name === 'headerField') {
+        headerField += buffer.toString(this.options.encoding, start, end);
+      } else if (name === 'headerValue') {
+        headerValue += buffer.toString(this.options.encoding, start, end);
+      } else if (name === 'headerEnd') {
+        headerField = headerField.toLowerCase();
+        part.headers[headerField] = headerValue;
+
+        // matches either a quoted-string or a token (RFC 2616 section 19.5.1)
+        const m = headerValue.match(
+          // eslint-disable-next-line no-useless-escape
+          /\bname=("([^"]*)"|([^\(\)<>@,;:\\"\/\[\]\?=\{\}\s\t/]+))/i,
+        );
+        if (headerField === 'content-disposition') {
+          if (m) {
+            part.name = m[2] || m[3] || '';
+          }
+
+          part.originalFilename = this._getFileName(headerValue);
+        } else if (headerField === 'content-type') {
+          part.mimetype = headerValue;
+        } else if (headerField === 'content-transfer-encoding') {
+          part.transferEncoding = headerValue.toLowerCase();
+        }
+
+        headerField = '';
+        headerValue = '';
+      } else if (name === 'headersEnd') {
+        switch (part.transferEncoding) {
+          case 'binary':
+          case '7bit':
+          case '8bit':
+          case 'utf-8': {
+            const dataPropagation = (ctx) => {
+              if (ctx.name === 'partData') {
+                part.emit('data', ctx.buffer.slice(ctx.start, ctx.end));
+              }
+            };
+            const dataStopPropagation = (ctx) => {
+              if (ctx.name === 'partEnd') {
+                part.emit('end');
+                parser.off('data', dataPropagation);
+                parser.off('data', dataStopPropagation);
+              }
+            };
+            parser.on('data', dataPropagation);
+            parser.on('data', dataStopPropagation);
+            break;
+          }
+          case 'base64': {
+            const dataPropagation = (ctx) => {
+              if (ctx.name === 'partData') {
+                part.transferBuffer += ctx.buffer
+                  .slice(ctx.start, ctx.end)
+                  .toString('ascii');
+
+                /*
+                  four bytes (chars) in base64 converts to three bytes in binary
+                  encoding. So we should always work with a number of bytes that
+                  can be divided by 4, it will result in a number of buytes that
+                  can be divided vy 3.
+                  */
+                const offset = parseInt(part.transferBuffer.length / 4, 10) * 4;
+                part.emit(
+                  'data',
+                  Buffer.from(
+                    part.transferBuffer.substring(0, offset),
+                    'base64',
+                  ),
+                );
+                part.transferBuffer = part.transferBuffer.substring(offset);
+              }
+            };
+            const dataStopPropagation = (ctx) => {
+              if (ctx.name === 'partEnd') {
+                part.emit('data', Buffer.from(part.transferBuffer, 'base64'));
+                part.emit('end');
+                parser.off('data', dataPropagation);
+                parser.off('data', dataStopPropagation);
+              }
+            };
+            parser.on('data', dataPropagation);
+            parser.on('data', dataStopPropagation);
+            break;
+          }
+          default:
+            return this._error(
+              new FormidableError(
+                'unknown transfer-encoding',
+                errors.unknownTransferEncoding,
+                501,
+              ),
+            );
+        }
+
+        this.onPart(part);
+      } else if (name === 'end') {
+        this.ended = true;
+        this._maybeEnd();
+      }
+    });
+
+    this._parser = parser;
+  };
+}

node_modules/formidable/src/plugins/octetstream.js

@@ -0,0 +1,86 @@
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const OctetStreamParser = require('../parsers/OctetStream');
+
+// the `options` is also available through the `options` / `formidable.options`
+module.exports = function plugin(formidable, options) {
+  // the `this` context is always formidable, as the first argument of a plugin
+  // but this allows us to customize/test each plugin
+
+  /* istanbul ignore next */
+  const self = this || formidable;
+
+  if (/octet-stream/i.test(self.headers['content-type'])) {
+    init.call(self, self, options);
+  }
+
+  return self;
+};
+
+// Note that it's a good practice (but it's up to you) to use the `this.options` instead
+// of the passed `options` (second) param, because when you decide
+// to test the plugin you can pass custom `this` context to it (and so `this.options`)
+function init(_self, _opts) {
+  this.type = 'octet-stream';
+  const originalFilename = this.headers['x-file-name'];
+  const mimetype = this.headers['content-type'];
+
+  const thisPart = {
+    originalFilename,
+    mimetype,
+  };
+  const newFilename = this._getNewName(thisPart);
+  const filepath = this._joinDirectoryName(newFilename);
+  const file = this._newFile({
+    newFilename,
+    filepath,
+    originalFilename,
+    mimetype,
+  });
+
+  this.emit('fileBegin', originalFilename, file);
+  file.open();
+  this.openedFiles.push(file);
+  this._flushing += 1;
+
+  this._parser = new OctetStreamParser(this.options);
+
+  // Keep track of writes that haven't finished so we don't emit the file before it's done being written
+  let outstandingWrites = 0;
+
+  this._parser.on('data', (buffer) => {
+    this.pause();
+    outstandingWrites += 1;
+
+    file.write(buffer, () => {
+      outstandingWrites -= 1;
+      this.resume();
+
+      if (this.ended) {
+        this._parser.emit('doneWritingFile');
+      }
+    });
+  });
+
+  this._parser.on('end', () => {
+    this._flushing -= 1;
+    this.ended = true;
+
+    const done = () => {
+      file.end(() => {
+        this.emit('file', 'file', file);
+        this._maybeEnd();
+      });
+    };
+
+    if (outstandingWrites === 0) {
+      done();
+    } else {
+      this._parser.once('doneWritingFile', done);
+    }
+  });
+
+  return this;
+}

node_modules/formidable/src/plugins/querystring.js

@@ -0,0 +1,42 @@
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const QuerystringParser = require('../parsers/Querystring');
+
+// the `options` is also available through the `this.options` / `formidable.options`
+module.exports = function plugin(formidable, options) {
+  // the `this` context is always formidable, as the first argument of a plugin
+  // but this allows us to customize/test each plugin
+
+  /* istanbul ignore next */
+  const self = this || formidable;
+
+  if (/urlencoded/i.test(self.headers['content-type'])) {
+    init.call(self, self, options);
+  }
+
+  return self;
+};
+
+// Note that it's a good practice (but it's up to you) to use the `this.options` instead
+// of the passed `options` (second) param, because when you decide
+// to test the plugin you can pass custom `this` context to it (and so `this.options`)
+function init(_self, _opts) {
+  this.type = 'urlencoded';
+
+  const parser = new QuerystringParser(this.options);
+
+  parser.on('data', ({ key, value }) => {
+    this.emit('field', key, value);
+  });
+
+  parser.once('end', () => {
+    this.ended = true;
+    this._maybeEnd();
+  });
+
+  this._parser = parser;
+
+  return this;
+}