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node_modules/mongoose/lib/utils.js

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+'use strict';
+
+/*!
+ * Module dependencies.
+ */
+
+const ms = require('ms');
+const mpath = require('mpath');
+const ObjectId = require('./types/objectid');
+const PopulateOptions = require('./options/PopulateOptions');
+const clone = require('./helpers/clone');
+const immediate = require('./helpers/immediate');
+const isObject = require('./helpers/isObject');
+const isMongooseArray = require('./types/array/isMongooseArray');
+const isMongooseDocumentArray = require('./types/DocumentArray/isMongooseDocumentArray');
+const isBsonType = require('./helpers/isBsonType');
+const getFunctionName = require('./helpers/getFunctionName');
+const isMongooseObject = require('./helpers/isMongooseObject');
+const promiseOrCallback = require('./helpers/promiseOrCallback');
+const schemaMerge = require('./helpers/schema/merge');
+const specialProperties = require('./helpers/specialProperties');
+const { trustedSymbol } = require('./helpers/query/trusted');
+
+let Document;
+
+exports.specialProperties = specialProperties;
+
+exports.isMongooseArray = isMongooseArray.isMongooseArray;
+exports.isMongooseDocumentArray = isMongooseDocumentArray.isMongooseDocumentArray;
+exports.registerMongooseArray = isMongooseArray.registerMongooseArray;
+exports.registerMongooseDocumentArray = isMongooseDocumentArray.registerMongooseDocumentArray;
+
+/**
+ * Produces a collection name from model `name`. By default, just returns
+ * the model name
+ *
+ * @param {String} name a model name
+ * @param {Function} pluralize function that pluralizes the collection name
+ * @return {String} a collection name
+ * @api private
+ */
+
+exports.toCollectionName = function(name, pluralize) {
+  if (name === 'system.profile') {
+    return name;
+  }
+  if (name === 'system.indexes') {
+    return name;
+  }
+  if (typeof pluralize === 'function') {
+    return pluralize(name);
+  }
+  return name;
+};
+
+/**
+ * Determines if `a` and `b` are deep equal.
+ *
+ * Modified from node/lib/assert.js
+ *
+ * @param {any} a a value to compare to `b`
+ * @param {any} b a value to compare to `a`
+ * @return {Boolean}
+ * @api private
+ */
+
+exports.deepEqual = function deepEqual(a, b) {
+  if (a === b) {
+    return true;
+  }
+
+  if (typeof a !== 'object' || typeof b !== 'object') {
+    return a === b;
+  }
+
+  if (a instanceof Date && b instanceof Date) {
+    return a.getTime() === b.getTime();
+  }
+
+  if ((isBsonType(a, 'ObjectId') && isBsonType(b, 'ObjectId')) ||
+      (isBsonType(a, 'Decimal128') && isBsonType(b, 'Decimal128'))) {
+    return a.toString() === b.toString();
+  }
+
+  if (a instanceof RegExp && b instanceof RegExp) {
+    return a.source === b.source &&
+        a.ignoreCase === b.ignoreCase &&
+        a.multiline === b.multiline &&
+        a.global === b.global &&
+        a.dotAll === b.dotAll &&
+        a.unicode === b.unicode &&
+        a.sticky === b.sticky &&
+        a.hasIndices === b.hasIndices;
+  }
+
+  if (a == null || b == null) {
+    return false;
+  }
+
+  if (a.prototype !== b.prototype) {
+    return false;
+  }
+
+  if (a instanceof Map || b instanceof Map) {
+    if (!(a instanceof Map) || !(b instanceof Map)) {
+      return false;
+    }
+    return deepEqual(Array.from(a.keys()), Array.from(b.keys())) &&
+      deepEqual(Array.from(a.values()), Array.from(b.values()));
+  }
+
+  // Handle MongooseNumbers
+  if (a instanceof Number && b instanceof Number) {
+    return a.valueOf() === b.valueOf();
+  }
+
+  if (Buffer.isBuffer(a)) {
+    return exports.buffer.areEqual(a, b);
+  }
+
+  if (Array.isArray(a) || Array.isArray(b)) {
+    if (!Array.isArray(a) || !Array.isArray(b)) {
+      return false;
+    }
+    const len = a.length;
+    if (len !== b.length) {
+      return false;
+    }
+    for (let i = 0; i < len; ++i) {
+      if (!deepEqual(a[i], b[i])) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  if (a.$__ != null) {
+    a = a._doc;
+  } else if (isMongooseObject(a)) {
+    a = a.toObject();
+  }
+
+  if (b.$__ != null) {
+    b = b._doc;
+  } else if (isMongooseObject(b)) {
+    b = b.toObject();
+  }
+
+  const ka = Object.keys(a);
+  const kb = Object.keys(b);
+  const kaLength = ka.length;
+
+  // having the same number of owned properties (keys incorporates
+  // hasOwnProperty)
+  if (kaLength !== kb.length) {
+    return false;
+  }
+
+  // ~~~cheap key test
+  for (let i = kaLength - 1; i >= 0; i--) {
+    if (ka[i] !== kb[i]) {
+      return false;
+    }
+  }
+
+  // equivalent values for every corresponding key, and
+  // ~~~possibly expensive deep test
+  for (const key of ka) {
+    if (!deepEqual(a[key], b[key])) {
+      return false;
+    }
+  }
+
+  return true;
+};
+
+/**
+ * Get the last element of an array
+ * @param {Array} arr
+ */
+
+exports.last = function(arr) {
+  if (arr.length > 0) {
+    return arr[arr.length - 1];
+  }
+  return void 0;
+};
+
+/*!
+ * ignore
+ */
+
+exports.promiseOrCallback = promiseOrCallback;
+
+/*!
+ * ignore
+ */
+
+exports.cloneArrays = function cloneArrays(arr) {
+  if (!Array.isArray(arr)) {
+    return arr;
+  }
+
+  return arr.map(el => exports.cloneArrays(el));
+};
+
+/*!
+ * ignore
+ */
+
+exports.omit = function omit(obj, keys) {
+  if (keys == null) {
+    return Object.assign({}, obj);
+  }
+  if (!Array.isArray(keys)) {
+    keys = [keys];
+  }
+
+  const ret = Object.assign({}, obj);
+  for (const key of keys) {
+    delete ret[key];
+  }
+  return ret;
+};
+
+
+/**
+ * Shallow copies defaults into options.
+ *
+ * @param {Object} defaults
+ * @param {Object} [options]
+ * @return {Object} the merged object
+ * @api private
+ */
+
+exports.options = function(defaults, options) {
+  const keys = Object.keys(defaults);
+  let i = keys.length;
+  let k;
+
+  options = options || {};
+
+  while (i--) {
+    k = keys[i];
+    if (!(k in options)) {
+      options[k] = defaults[k];
+    }
+  }
+
+  return options;
+};
+
+/**
+ * Merges `from` into `to` without overwriting existing properties.
+ *
+ * @param {Object} to
+ * @param {Object} from
+ * @param {Object} [options]
+ * @param {String} [path]
+ * @api private
+ */
+
+exports.merge = function merge(to, from, options, path) {
+  options = options || {};
+
+  const keys = Object.keys(from);
+  let i = 0;
+  const len = keys.length;
+  let key;
+
+  if (from[trustedSymbol]) {
+    to[trustedSymbol] = from[trustedSymbol];
+  }
+
+  path = path || '';
+  const omitNested = options.omitNested || {};
+
+  while (i < len) {
+    key = keys[i++];
+    if (options.omit && options.omit[key]) {
+      continue;
+    }
+    if (omitNested[path]) {
+      continue;
+    }
+    if (specialProperties.has(key)) {
+      continue;
+    }
+    if (to[key] == null) {
+      to[key] = from[key];
+    } else if (exports.isObject(from[key])) {
+      if (!exports.isObject(to[key])) {
+        to[key] = {};
+      }
+      if (from[key] != null) {
+        // Skip merging schemas if we're creating a discriminator schema and
+        // base schema has a given path as a single nested but discriminator schema
+        // has the path as a document array, or vice versa (gh-9534)
+        if (options.isDiscriminatorSchemaMerge &&
+            (from[key].$isSingleNested && to[key].$isMongooseDocumentArray) ||
+            (from[key].$isMongooseDocumentArray && to[key].$isSingleNested)) {
+          continue;
+        } else if (from[key].instanceOfSchema) {
+          if (to[key].instanceOfSchema) {
+            schemaMerge(to[key], from[key].clone(), options.isDiscriminatorSchemaMerge);
+          } else {
+            to[key] = from[key].clone();
+          }
+          continue;
+        } else if (isBsonType(from[key], 'ObjectId')) {
+          to[key] = new ObjectId(from[key]);
+          continue;
+        }
+      }
+      merge(to[key], from[key], options, path ? path + '.' + key : key);
+    } else if (options.overwrite) {
+      to[key] = from[key];
+    }
+  }
+};
+
+/**
+ * Applies toObject recursively.
+ *
+ * @param {Document|Array|Object} obj
+ * @return {Object}
+ * @api private
+ */
+
+exports.toObject = function toObject(obj) {
+  Document || (Document = require('./document'));
+  let ret;
+
+  if (obj == null) {
+    return obj;
+  }
+
+  if (obj instanceof Document) {
+    return obj.toObject();
+  }
+
+  if (Array.isArray(obj)) {
+    ret = [];
+
+    for (const doc of obj) {
+      ret.push(toObject(doc));
+    }
+
+    return ret;
+  }
+
+  if (exports.isPOJO(obj)) {
+    ret = {};
+
+    if (obj[trustedSymbol]) {
+      ret[trustedSymbol] = obj[trustedSymbol];
+    }
+
+    for (const k of Object.keys(obj)) {
+      if (specialProperties.has(k)) {
+        continue;
+      }
+      ret[k] = toObject(obj[k]);
+    }
+
+    return ret;
+  }
+
+  return obj;
+};
+
+exports.isObject = isObject;
+
+/**
+ * Determines if `arg` is a plain old JavaScript object (POJO). Specifically,
+ * `arg` must be an object but not an instance of any special class, like String,
+ * ObjectId, etc.
+ *
+ * `Object.getPrototypeOf()` is part of ES5: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf
+ *
+ * @param {Object|Array|String|Function|RegExp|any} arg
+ * @api private
+ * @return {Boolean}
+ */
+
+exports.isPOJO = require('./helpers/isPOJO');
+
+/**
+ * Determines if `arg` is an object that isn't an instance of a built-in value
+ * class, like Array, Buffer, ObjectId, etc.
+ * @param {Any} val
+ */
+
+exports.isNonBuiltinObject = function isNonBuiltinObject(val) {
+  return typeof val === 'object' &&
+    !exports.isNativeObject(val) &&
+    !exports.isMongooseType(val) &&
+    val != null;
+};
+
+/**
+ * Determines if `obj` is a built-in object like an array, date, boolean,
+ * etc.
+ * @param {Any} arg
+ */
+
+exports.isNativeObject = function(arg) {
+  return Array.isArray(arg) ||
+    arg instanceof Date ||
+    arg instanceof Boolean ||
+    arg instanceof Number ||
+    arg instanceof String;
+};
+
+/**
+ * Determines if `val` is an object that has no own keys
+ * @param {Any} val
+ */
+
+exports.isEmptyObject = function(val) {
+  return val != null &&
+    typeof val === 'object' &&
+    Object.keys(val).length === 0;
+};
+
+/**
+ * Search if `obj` or any POJOs nested underneath `obj` has a property named
+ * `key`
+ * @param {Object} obj
+ * @param {String} key
+ */
+
+exports.hasKey = function hasKey(obj, key) {
+  const props = Object.keys(obj);
+  for (const prop of props) {
+    if (prop === key) {
+      return true;
+    }
+    if (exports.isPOJO(obj[prop]) && exports.hasKey(obj[prop], key)) {
+      return true;
+    }
+  }
+  return false;
+};
+
+/**
+ * process.nextTick helper.
+ *
+ * Wraps `callback` in a try/catch + nextTick.
+ *
+ * node-mongodb-native has a habit of state corruption when an error is immediately thrown from within a collection callback.
+ *
+ * @param {Function} callback
+ * @api private
+ */
+
+exports.tick = function tick(callback) {
+  if (typeof callback !== 'function') {
+    return;
+  }
+  return function() {
+    try {
+      callback.apply(this, arguments);
+    } catch (err) {
+      // only nextTick on err to get out of
+      // the event loop and avoid state corruption.
+      immediate(function() {
+        throw err;
+      });
+    }
+  };
+};
+
+/**
+ * Returns true if `v` is an object that can be serialized as a primitive in
+ * MongoDB
+ * @param {Any} v
+ */
+
+exports.isMongooseType = function(v) {
+  return isBsonType(v, 'ObjectId') || isBsonType(v, 'Decimal128') || v instanceof Buffer;
+};
+
+exports.isMongooseObject = isMongooseObject;
+
+/**
+ * Converts `expires` options of index objects to `expiresAfterSeconds` options for MongoDB.
+ *
+ * @param {Object} object
+ * @api private
+ */
+
+exports.expires = function expires(object) {
+  if (!(object && object.constructor.name === 'Object')) {
+    return;
+  }
+  if (!('expires' in object)) {
+    return;
+  }
+
+  object.expireAfterSeconds = (typeof object.expires !== 'string')
+    ? object.expires
+    : Math.round(ms(object.expires) / 1000);
+  delete object.expires;
+};
+
+/**
+ * populate helper
+ * @param {String} path
+ * @param {String} select
+ * @param {Model} model
+ * @param {Object} match
+ * @param {Object} options
+ * @param {Any} subPopulate
+ * @param {Boolean} justOne
+ * @param {Boolean} count
+ */
+
+exports.populate = function populate(path, select, model, match, options, subPopulate, justOne, count) {
+  // might have passed an object specifying all arguments
+  let obj = null;
+  if (arguments.length === 1) {
+    if (path instanceof PopulateOptions) {
+      // If reusing old populate docs, avoid reusing `_docs` because that may
+      // lead to bugs and memory leaks. See gh-11641
+      path._docs = [];
+      path._childDocs = [];
+      return [path];
+    }
+
+    if (Array.isArray(path)) {
+      const singles = makeSingles(path);
+      return singles.map(o => exports.populate(o)[0]);
+    }
+
+    if (exports.isObject(path)) {
+      obj = Object.assign({}, path);
+    } else {
+      obj = { path: path };
+    }
+  } else if (typeof model === 'object') {
+    obj = {
+      path: path,
+      select: select,
+      match: model,
+      options: match
+    };
+  } else {
+    obj = {
+      path: path,
+      select: select,
+      model: model,
+      match: match,
+      options: options,
+      populate: subPopulate,
+      justOne: justOne,
+      count: count
+    };
+  }
+
+  if (typeof obj.path !== 'string') {
+    throw new TypeError('utils.populate: invalid path. Expected string. Got typeof `' + typeof path + '`');
+  }
+
+  return _populateObj(obj);
+
+  // The order of select/conditions args is opposite Model.find but
+  // necessary to keep backward compatibility (select could be
+  // an array, string, or object literal).
+  function makeSingles(arr) {
+    const ret = [];
+    arr.forEach(function(obj) {
+      if (/[\s]/.test(obj.path)) {
+        const paths = obj.path.split(' ');
+        paths.forEach(function(p) {
+          const copy = Object.assign({}, obj);
+          copy.path = p;
+          ret.push(copy);
+        });
+      } else {
+        ret.push(obj);
+      }
+    });
+
+    return ret;
+  }
+};
+
+function _populateObj(obj) {
+  if (Array.isArray(obj.populate)) {
+    const ret = [];
+    obj.populate.forEach(function(obj) {
+      if (/[\s]/.test(obj.path)) {
+        const copy = Object.assign({}, obj);
+        const paths = copy.path.split(' ');
+        paths.forEach(function(p) {
+          copy.path = p;
+          ret.push(exports.populate(copy)[0]);
+        });
+      } else {
+        ret.push(exports.populate(obj)[0]);
+      }
+    });
+    obj.populate = exports.populate(ret);
+  } else if (obj.populate != null && typeof obj.populate === 'object') {
+    obj.populate = exports.populate(obj.populate);
+  }
+
+  const ret = [];
+  const paths = obj.path.split(' ');
+  if (obj.options != null) {
+    obj.options = clone(obj.options);
+  }
+
+  for (const path of paths) {
+    ret.push(new PopulateOptions(Object.assign({}, obj, { path: path })));
+  }
+
+  return ret;
+}
+
+/**
+ * Return the value of `obj` at the given `path`.
+ *
+ * @param {String} path
+ * @param {Object} obj
+ * @param {Any} map
+ */
+
+exports.getValue = function(path, obj, map) {
+  return mpath.get(path, obj, '_doc', map);
+};
+
+/**
+ * Sets the value of `obj` at the given `path`.
+ *
+ * @param {String} path
+ * @param {Anything} val
+ * @param {Object} obj
+ * @param {Any} map
+ * @param {Any} _copying
+ */
+
+exports.setValue = function(path, val, obj, map, _copying) {
+  mpath.set(path, val, obj, '_doc', map, _copying);
+};
+
+/**
+ * Returns an array of values from object `o`.
+ *
+ * @param {Object} o
+ * @return {Array}
+ * @api private
+ */
+
+exports.object = {};
+exports.object.vals = function vals(o) {
+  const keys = Object.keys(o);
+  let i = keys.length;
+  const ret = [];
+
+  while (i--) {
+    ret.push(o[keys[i]]);
+  }
+
+  return ret;
+};
+
+/**
+ * @see exports.options
+ */
+
+exports.object.shallowCopy = exports.options;
+
+const hop = Object.prototype.hasOwnProperty;
+
+/**
+ * Safer helper for hasOwnProperty checks
+ *
+ * @param {Object} obj
+ * @param {String} prop
+ */
+
+exports.object.hasOwnProperty = function(obj, prop) {
+  return hop.call(obj, prop);
+};
+
+/**
+ * Determine if `val` is null or undefined
+ *
+ * @param {Any} val
+ * @return {Boolean}
+ */
+
+exports.isNullOrUndefined = function(val) {
+  return val === null || val === undefined;
+};
+
+/*!
+ * ignore
+ */
+
+exports.array = {};
+
+/**
+ * Flattens an array.
+ *
+ * [ 1, [ 2, 3, [4] ]] -> [1,2,3,4]
+ *
+ * @param {Array} arr
+ * @param {Function} [filter] If passed, will be invoked with each item in the array. If `filter` returns a falsy value, the item will not be included in the results.
+ * @param {Array} ret
+ * @return {Array}
+ * @api private
+ */
+
+exports.array.flatten = function flatten(arr, filter, ret) {
+  ret || (ret = []);
+
+  arr.forEach(function(item) {
+    if (Array.isArray(item)) {
+      flatten(item, filter, ret);
+    } else {
+      if (!filter || filter(item)) {
+        ret.push(item);
+      }
+    }
+  });
+
+  return ret;
+};
+
+/*!
+ * ignore
+ */
+
+const _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+exports.hasUserDefinedProperty = function(obj, key) {
+  if (obj == null) {
+    return false;
+  }
+
+  if (Array.isArray(key)) {
+    for (const k of key) {
+      if (exports.hasUserDefinedProperty(obj, k)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  if (_hasOwnProperty.call(obj, key)) {
+    return true;
+  }
+  if (typeof obj === 'object' && key in obj) {
+    const v = obj[key];
+    return v !== Object.prototype[key] && v !== Array.prototype[key];
+  }
+
+  return false;
+};
+
+/*!
+ * ignore
+ */
+
+const MAX_ARRAY_INDEX = Math.pow(2, 32) - 1;
+
+exports.isArrayIndex = function(val) {
+  if (typeof val === 'number') {
+    return val >= 0 && val <= MAX_ARRAY_INDEX;
+  }
+  if (typeof val === 'string') {
+    if (!/^\d+$/.test(val)) {
+      return false;
+    }
+    val = +val;
+    return val >= 0 && val <= MAX_ARRAY_INDEX;
+  }
+
+  return false;
+};
+
+/**
+ * Removes duplicate values from an array
+ *
+ * [1, 2, 3, 3, 5] => [1, 2, 3, 5]
+ * [ ObjectId("550988ba0c19d57f697dc45e"), ObjectId("550988ba0c19d57f697dc45e") ]
+ *    => [ObjectId("550988ba0c19d57f697dc45e")]
+ *
+ * @param {Array} arr
+ * @return {Array}
+ * @api private
+ */
+
+exports.array.unique = function(arr) {
+  const primitives = new Set();
+  const ids = new Set();
+  const ret = [];
+
+  for (const item of arr) {
+    if (typeof item === 'number' || typeof item === 'string' || item == null) {
+      if (primitives.has(item)) {
+        continue;
+      }
+      ret.push(item);
+      primitives.add(item);
+    } else if (isBsonType(item, 'ObjectId')) {
+      if (ids.has(item.toString())) {
+        continue;
+      }
+      ret.push(item);
+      ids.add(item.toString());
+    } else {
+      ret.push(item);
+    }
+  }
+
+  return ret;
+};
+
+exports.buffer = {};
+
+/**
+ * Determines if two buffers are equal.
+ *
+ * @param {Buffer} a
+ * @param {Object} b
+ */
+
+exports.buffer.areEqual = function(a, b) {
+  if (!Buffer.isBuffer(a)) {
+    return false;
+  }
+  if (!Buffer.isBuffer(b)) {
+    return false;
+  }
+  if (a.length !== b.length) {
+    return false;
+  }
+  for (let i = 0, len = a.length; i < len; ++i) {
+    if (a[i] !== b[i]) {
+      return false;
+    }
+  }
+  return true;
+};
+
+exports.getFunctionName = getFunctionName;
+
+/**
+ * Decorate buffers
+ * @param {Object} destination
+ * @param {Object} source
+ */
+
+exports.decorate = function(destination, source) {
+  for (const key in source) {
+    if (specialProperties.has(key)) {
+      continue;
+    }
+    destination[key] = source[key];
+  }
+};
+
+/**
+ * merges to with a copy of from
+ *
+ * @param {Object} to
+ * @param {Object} fromObj
+ * @api private
+ */
+
+exports.mergeClone = function(to, fromObj) {
+  if (isMongooseObject(fromObj)) {
+    fromObj = fromObj.toObject({
+      transform: false,
+      virtuals: false,
+      depopulate: true,
+      getters: false,
+      flattenDecimals: false
+    });
+  }
+  const keys = Object.keys(fromObj);
+  const len = keys.length;
+  let i = 0;
+  let key;
+
+  while (i < len) {
+    key = keys[i++];
+    if (specialProperties.has(key)) {
+      continue;
+    }
+    if (typeof to[key] === 'undefined') {
+      to[key] = clone(fromObj[key], {
+        transform: false,
+        virtuals: false,
+        depopulate: true,
+        getters: false,
+        flattenDecimals: false
+      });
+    } else {
+      let val = fromObj[key];
+      if (val != null && val.valueOf && !(val instanceof Date)) {
+        val = val.valueOf();
+      }
+      if (exports.isObject(val)) {
+        let obj = val;
+        if (isMongooseObject(val) && !val.isMongooseBuffer) {
+          obj = obj.toObject({
+            transform: false,
+            virtuals: false,
+            depopulate: true,
+            getters: false,
+            flattenDecimals: false
+          });
+        }
+        if (val.isMongooseBuffer) {
+          obj = Buffer.from(obj);
+        }
+        exports.mergeClone(to[key], obj);
+      } else {
+        to[key] = clone(val, {
+          flattenDecimals: false
+        });
+      }
+    }
+  }
+};
+
+/**
+ * Executes a function on each element of an array (like _.each)
+ *
+ * @param {Array} arr
+ * @param {Function} fn
+ * @api private
+ */
+
+exports.each = function(arr, fn) {
+  for (const item of arr) {
+    fn(item);
+  }
+};
+
+/*!
+ * ignore
+ */
+
+exports.getOption = function(name) {
+  const sources = Array.prototype.slice.call(arguments, 1);
+
+  for (const source of sources) {
+    if (source == null) {
+      continue;
+    }
+    if (source[name] != null) {
+      return source[name];
+    }
+  }
+
+  return null;
+};
+
+/*!
+ * ignore
+ */
+
+exports.noop = function() {};
+
+exports.errorToPOJO = function errorToPOJO(error) {
+  const isError = error instanceof Error;
+  if (!isError) {
+    throw new Error('`error` must be `instanceof Error`.');
+  }
+
+  const ret = {};
+  for (const properyName of Object.getOwnPropertyNames(error)) {
+    ret[properyName] = error[properyName];
+  }
+  return ret;
+};
+
+/*!
+ * ignore
+ */
+
+exports.warn = function warn(message) {
+  return process.emitWarning(message, { code: 'MONGOOSE' });
+};
+
+
+exports.injectTimestampsOption = function injectTimestampsOption(writeOperation, timestampsOption) {
+  if (timestampsOption == null) {
+    return;
+  }
+  writeOperation.timestamps = timestampsOption;
+};