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node_modules/winston-transport/dist/index.js

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+'use strict';
+
+// Expose modern transport directly as the export
+
+module.exports = require('./modern');
+
+// Expose legacy stream
+module.exports.LegacyTransportStream = require('./legacy');

node_modules/winston-transport/dist/legacy.js

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+'use strict';
+
+var util = require('util');
+
+var _require = require('triple-beam'),
+    LEVEL = _require.LEVEL;
+
+var TransportStream = require('./modern');
+
+/**
+ * Constructor function for the LegacyTransportStream. This is an internal
+ * wrapper `winston >= 3` uses to wrap older transports implementing
+ * log(level, message, meta).
+ * @param {Object} options - Options for this TransportStream instance.
+ * @param {Transpot} options.transport - winston@2 or older Transport to wrap.
+ */
+
+var LegacyTransportStream = module.exports = function LegacyTransportStream() {
+  var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
+
+  TransportStream.call(this, options);
+  if (!options.transport || typeof options.transport.log !== 'function') {
+    throw new Error('Invalid transport, must be an object with a log method.');
+  }
+
+  this.transport = options.transport;
+  this.level = this.level || options.transport.level;
+  this.handleExceptions = this.handleExceptions || options.transport.handleExceptions;
+
+  // Display our deprecation notice.
+  this._deprecated();
+
+  // Properly bubble up errors from the transport to the
+  // LegacyTransportStream instance, but only once no matter how many times
+  // this transport is shared.
+  function transportError(err) {
+    this.emit('error', err, this.transport);
+  }
+
+  if (!this.transport.__winstonError) {
+    this.transport.__winstonError = transportError.bind(this);
+    this.transport.on('error', this.transport.__winstonError);
+  }
+};
+
+/*
+ * Inherit from TransportStream using Node.js built-ins
+ */
+util.inherits(LegacyTransportStream, TransportStream);
+
+/**
+ * Writes the info object to our transport instance.
+ * @param {mixed} info - TODO: add param description.
+ * @param {mixed} enc - TODO: add param description.
+ * @param {function} callback - TODO: add param description.
+ * @returns {undefined}
+ * @private
+ */
+LegacyTransportStream.prototype._write = function _write(info, enc, callback) {
+  if (this.silent || info.exception === true && !this.handleExceptions) {
+    return callback(null);
+  }
+
+  // Remark: This has to be handled in the base transport now because we
+  // cannot conditionally write to our pipe targets as stream.
+  if (!this.level || this.levels[this.level] >= this.levels[info[LEVEL]]) {
+    this.transport.log(info[LEVEL], info.message, info, this._nop);
+  }
+
+  callback(null);
+};
+
+/**
+ * Writes the batch of info objects (i.e. "object chunks") to our transport
+ * instance after performing any necessary filtering.
+ * @param {mixed} chunks - TODO: add params description.
+ * @param {function} callback - TODO: add params description.
+ * @returns {mixed} - TODO: add returns description.
+ * @private
+ */
+LegacyTransportStream.prototype._writev = function _writev(chunks, callback) {
+  for (var i = 0; i < chunks.length; i++) {
+    if (this._accept(chunks[i])) {
+      this.transport.log(chunks[i].chunk[LEVEL], chunks[i].chunk.message, chunks[i].chunk, this._nop);
+      chunks[i].callback();
+    }
+  }
+
+  return callback(null);
+};
+
+/**
+ * Displays a deprecation notice. Defined as a function so it can be
+ * overriden in tests.
+ * @returns {undefined}
+ */
+LegacyTransportStream.prototype._deprecated = function _deprecated() {
+  // eslint-disable-next-line no-console
+  console.error([this.transport.name + ' is a legacy winston transport. Consider upgrading: ', '- Upgrade docs: https://github.com/winstonjs/winston/blob/master/UPGRADE-3.0.md'].join('\n'));
+};
+
+/**
+ * Clean up error handling state on the legacy transport associated
+ * with this instance.
+ * @returns {undefined}
+ */
+LegacyTransportStream.prototype.close = function close() {
+  if (this.transport.close) {
+    this.transport.close();
+  }
+
+  if (this.transport.__winstonError) {
+    this.transport.removeListener('error', this.transport.__winstonError);
+    this.transport.__winstonError = null;
+  }
+};

node_modules/winston-transport/dist/modern.js

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+'use strict';
+
+var util = require('util');
+var Writable = require('readable-stream/lib/_stream_writable.js');
+
+var _require = require('triple-beam'),
+    LEVEL = _require.LEVEL;
+
+/**
+ * Constructor function for the TransportStream. This is the base prototype
+ * that all `winston >= 3` transports should inherit from.
+ * @param {Object} options - Options for this TransportStream instance
+ * @param {String} options.level - Highest level according to RFC5424.
+ * @param {Boolean} options.handleExceptions - If true, info with
+ * { exception: true } will be written.
+ * @param {Function} options.log - Custom log function for simple Transport
+ * creation
+ * @param {Function} options.close - Called on "unpipe" from parent.
+ */
+
+
+var TransportStream = module.exports = function TransportStream() {
+  var _this = this;
+
+  var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
+
+  Writable.call(this, { objectMode: true, highWaterMark: options.highWaterMark });
+
+  this.format = options.format;
+  this.level = options.level;
+  this.handleExceptions = options.handleExceptions;
+  this.handleRejections = options.handleRejections;
+  this.silent = options.silent;
+
+  if (options.log) this.log = options.log;
+  if (options.logv) this.logv = options.logv;
+  if (options.close) this.close = options.close;
+
+  // Get the levels from the source we are piped from.
+  this.once('pipe', function (logger) {
+    // Remark (indexzero): this bookkeeping can only support multiple
+    // Logger parents with the same `levels`. This comes into play in
+    // the `winston.Container` code in which `container.add` takes
+    // a fully realized set of options with pre-constructed TransportStreams.
+    _this.levels = logger.levels;
+    _this.parent = logger;
+  });
+
+  // If and/or when the transport is removed from this instance
+  this.once('unpipe', function (src) {
+    // Remark (indexzero): this bookkeeping can only support multiple
+    // Logger parents with the same `levels`. This comes into play in
+    // the `winston.Container` code in which `container.add` takes
+    // a fully realized set of options with pre-constructed TransportStreams.
+    if (src === _this.parent) {
+      _this.parent = null;
+      if (_this.close) {
+        _this.close();
+      }
+    }
+  });
+};
+
+/*
+ * Inherit from Writeable using Node.js built-ins
+ */
+util.inherits(TransportStream, Writable);
+
+/**
+ * Writes the info object to our transport instance.
+ * @param {mixed} info - TODO: add param description.
+ * @param {mixed} enc - TODO: add param description.
+ * @param {function} callback - TODO: add param description.
+ * @returns {undefined}
+ * @private
+ */
+TransportStream.prototype._write = function _write(info, enc, callback) {
+  if (this.silent || info.exception === true && !this.handleExceptions) {
+    return callback(null);
+  }
+
+  // Remark: This has to be handled in the base transport now because we
+  // cannot conditionally write to our pipe targets as stream. We always
+  // prefer any explicit level set on the Transport itself falling back to
+  // any level set on the parent.
+  var level = this.level || this.parent && this.parent.level;
+
+  if (!level || this.levels[level] >= this.levels[info[LEVEL]]) {
+    if (info && !this.format) {
+      return this.log(info, callback);
+    }
+
+    var errState = void 0;
+    var transformed = void 0;
+
+    // We trap(and re-throw) any errors generated by the user-provided format, but also
+    // guarantee that the streams callback is invoked so that we can continue flowing.
+    try {
+      transformed = this.format.transform(Object.assign({}, info), this.format.options);
+    } catch (err) {
+      errState = err;
+    }
+
+    if (errState || !transformed) {
+      // eslint-disable-next-line callback-return
+      callback();
+      if (errState) throw errState;
+      return;
+    }
+
+    return this.log(transformed, callback);
+  }
+  this._writableState.sync = false;
+  return callback(null);
+};
+
+/**
+ * Writes the batch of info objects (i.e. "object chunks") to our transport
+ * instance after performing any necessary filtering.
+ * @param {mixed} chunks - TODO: add params description.
+ * @param {function} callback - TODO: add params description.
+ * @returns {mixed} - TODO: add returns description.
+ * @private
+ */
+TransportStream.prototype._writev = function _writev(chunks, callback) {
+  if (this.logv) {
+    var infos = chunks.filter(this._accept, this);
+    if (!infos.length) {
+      return callback(null);
+    }
+
+    // Remark (indexzero): from a performance perspective if Transport
+    // implementers do choose to implement logv should we make it their
+    // responsibility to invoke their format?
+    return this.logv(infos, callback);
+  }
+
+  for (var i = 0; i < chunks.length; i++) {
+    if (!this._accept(chunks[i])) continue;
+
+    if (chunks[i].chunk && !this.format) {
+      this.log(chunks[i].chunk, chunks[i].callback);
+      continue;
+    }
+
+    var errState = void 0;
+    var transformed = void 0;
+
+    // We trap(and re-throw) any errors generated by the user-provided format, but also
+    // guarantee that the streams callback is invoked so that we can continue flowing.
+    try {
+      transformed = this.format.transform(Object.assign({}, chunks[i].chunk), this.format.options);
+    } catch (err) {
+      errState = err;
+    }
+
+    if (errState || !transformed) {
+      // eslint-disable-next-line callback-return
+      chunks[i].callback();
+      if (errState) {
+        // eslint-disable-next-line callback-return
+        callback(null);
+        throw errState;
+      }
+    } else {
+      this.log(transformed, chunks[i].callback);
+    }
+  }
+
+  return callback(null);
+};
+
+/**
+ * Predicate function that returns true if the specfied `info` on the
+ * WriteReq, `write`, should be passed down into the derived
+ * TransportStream's I/O via `.log(info, callback)`.
+ * @param {WriteReq} write - winston@3 Node.js WriteReq for the `info` object
+ * representing the log message.
+ * @returns {Boolean} - Value indicating if the `write` should be accepted &
+ * logged.
+ */
+TransportStream.prototype._accept = function _accept(write) {
+  var info = write.chunk;
+  if (this.silent) {
+    return false;
+  }
+
+  // We always prefer any explicit level set on the Transport itself
+  // falling back to any level set on the parent.
+  var level = this.level || this.parent && this.parent.level;
+
+  // Immediately check the average case: log level filtering.
+  if (info.exception === true || !level || this.levels[level] >= this.levels[info[LEVEL]]) {
+    // Ensure the info object is valid based on `{ exception }`:
+    // 1. { handleExceptions: true }: all `info` objects are valid
+    // 2. { exception: false }: accepted by all transports.
+    if (this.handleExceptions || info.exception !== true) {
+      return true;
+    }
+  }
+
+  return false;
+};
+
+/**
+ * _nop is short for "No operation"
+ * @returns {Boolean} Intentionally false.
+ */
+TransportStream.prototype._nop = function _nop() {
+  // eslint-disable-next-line no-undefined
+  return void undefined;
+};