AWS Lambda mounts Lambda Layers to /opt/nodejs/src and development source must be kept at /lib/<module_name>/nodejs. This causes problems with some IDEs not being able to find source to provide code hints. Above simple shell script will create symlinks to overcome this problem.

mount.py

#!/usr/bin/python

import os
import glob
import sys

# variables
srcBase = "lib/nodejs/src/"
cwd = os.getcwd()

if len(sys.argv) == 3:
  sb = cwd + "/lib/" + sys.argv[1] + "/nodejs/src/*." + sys.argv[2]
  tb = cwd + "/opt/nodejs/src/"
else:
  sb = cwd + "/lib/" + sys.argv[1] + "/nodejs/src/" + sys.argv[3] + "/*." + sys.argv[2]
  tb = cwd + "/opt/nodejs/src/" + sys.argv[3] + "/"

# create base folder structure
if not os.path.exists(tb):
  os.makedirs(tb)

targets = glob.glob(sb)

for target in targets:
  file = os.path.basename(target)
  path = tb + file

  if not os.path.islink(path):
    os.symlink(target, path)
    print file + " --> " + target
  else:
    print "link " + file + " found ... skipping."
    
# assumption - assumes you are saving your layer under "/lib/<module_name>/nodejs" local folder.
# usage - python mount.py <src_folder> <extension> <sub_folder>
# eg1 - python mount.py helpers js
# eg2 - python mount.py helpers json models