fix(*): restore ability to webpack by removing makeLazyLoader

* fix(lib): remove makeLazyLoader

* memoize lazy loading function

lib/operations/collection_ops.js

@@ -18,13 +18,24 @@ const handleCallback = require('../utils').handleCallback;
 const indexInformationDb = require('./db_ops').indexInformation;
 const isObject = require('../utils').isObject;
 const Long = require('mongodb-core').BSON.Long;
-const makeLazyLoader = require('../utils').makeLazyLoader;
 const MongoError = require('mongodb-core').MongoError;
 const ReadPreference = require('mongodb-core').ReadPreference;
 const toError = require('../utils').toError;
 
-const loadCollection = makeLazyLoader(`${__dirname}/../collection`);
-const loadDb = makeLazyLoader(`${__dirname}/../db`);
+let collection;
+function loadCollection() {
+  if (!collection) {
+    collection = require('../collection');
+  }
+  return collection;
+}
+let db;
+function loadDb() {
+  if (!db) {
+    db = require('../db');
+  }
+  return db;
+}
 
 /**
  * Group function helper

lib/operations/cursor_ops.js

@@ -3,11 +3,16 @@
 const buildCountCommand = require('./collection_ops').buildCountCommand;
 const formattedOrderClause = require('../utils').formattedOrderClause;
 const handleCallback = require('../utils').handleCallback;
-const makeLazyLoader = require('../utils').makeLazyLoader;
 const MongoError = require('mongodb-core').MongoError;
 const push = Array.prototype.push;
 
-const loadCursor = makeLazyLoader(`${__dirname}/../cursor`);
+let cursor;
+function loadCursor() {
+  if (!cursor) {
+    cursor = require('../cursor');
+  }
+  return cursor;
+}
 
 /**
  * Get the count of documents for this cursor.

lib/operations/db_ops.js

@@ -6,7 +6,6 @@ const resolveReadPreference = require('../utils').resolveReadPreference;
 const crypto = require('crypto');
 const debugOptions = require('../utils').debugOptions;
 const handleCallback = require('../utils').handleCallback;
-const makeLazyLoader = require('../utils').makeLazyLoader;
 const MongoError = require('mongodb-core').MongoError;
 const parseIndexOptions = require('../utils').parseIndexOptions;
 const ReadPreference = require('mongodb-core').ReadPreference;
@@ -18,8 +17,20 @@ const findOne = require('./collection_ops').findOne;
 const remove = require('./collection_ops').remove;
 const updateOne = require('./collection_ops').updateOne;
 
-const loadCollection = makeLazyLoader(`${__dirname}/../collection`);
-const loadDb = makeLazyLoader(`${__dirname}/../db`);
+let collection;
+function loadCollection() {
+  if (!collection) {
+    collection = require('../collection');
+  }
+  return collection;
+}
+let db;
+function loadDb() {
+  if (!db) {
+    db = require('../db');
+  }
+  return db;
+}
 
 const debugFields = [
   'authSource',

lib/operations/mongo_client_ops.js

@@ -3,7 +3,6 @@
 const authenticate = require('../authenticate');
 const deprecate = require('util').deprecate;
 const Logger = require('mongodb-core').Logger;
-const makeLazyLoader = require('../utils').makeLazyLoader;
 const MongoError = require('mongodb-core').MongoError;
 const Mongos = require('../topologies/mongos');
 const parse = require('mongodb-core').parseConnectionString;
@@ -12,7 +11,13 @@ const ReplSet = require('../topologies/replset');
 const Server = require('../topologies/server');
 const ServerSessionPool = require('mongodb-core').Sessions.ServerSessionPool;
 
-const loadClient = makeLazyLoader(`${__dirname}/../mongo_client`);
+let client;
+function loadClient() {
+  if (!client) {
+    client = require('../mongo_client');
+  }
+  return client;
+}
 
 const monitoringEvents = [
   'timeout',

lib/utils.js

@@ -694,16 +694,6 @@ function deprecateOptions(config, fn) {
   return deprecated;
 }
 
-function makeLazyLoader(modulePath) {
-  let mod;
-  return function lazyLoad() {
-    if (!mod) {
-      mod = require(modulePath);
-    }
-    return mod;
-  };
-}
-
 module.exports = {
   filterOptions,
   mergeOptions,
@@ -729,6 +719,5 @@ module.exports = {
   isPromiseLike,
   decorateWithCollation,
   decorateWithReadConcern,
-  deprecateOptions,
-  makeLazyLoader
+  deprecateOptions
 };