Cannot find module error after install

[Happy0]

`
[happy0@delta patchwork]$ sudo npm install -g depject-tree
/usr/bin/depject-tree -> /usr/lib/node_modules/depject-tree/index.js

• depject-tree@1.1.1
  updated 1 package in 0.354s
  [happy0@delta patchwork]$ depject-tree . node_modules/patchcore
  module.js:491
  throw err;
  ^

Error: Cannot find module 'depject/is'
at Function.Module._resolveFilename (module.js:489:15)
at Function.Module._load (module.js:439:25)
at Module.require (module.js:517:17)
at require (internal/module.js:11:18)
at Object. (/usr/lib/node_modules/depject-tree/index.js:8:17)
at Module._compile (module.js:573:30)
at Object.Module._extensions..js (module.js:584:10)
at Module.load (module.js:507:32)
at tryModuleLoad (module.js:470:12)
at Function.Module._load (module.js:462:3)
[happy0@delta patchwork]$
[happy0@delta patchwork]$
`

[Happy0]

Ah, it worked after I globally installed depject and libneste.

Should these be part of the package.json for depject-tree? (Note: I've only recently began using nodejs, so I'm not 100% sure what the convention is.)