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Package does not work as a library

See original GitHub issue

Steps to reproduce the problem:

npm init a project on node 4.3.2
npm i --save-dev contentful-export

contentful-export@1.0.4 node_modules/contentful-export
├── json-stringify-safe@5.0.1
├── bluebird@3.4.1
├── npmlog@2.0.4 (ansi@0.3.1, gauge@1.2.7, are-we-there-yet@1.1.2)
├── yargs@4.8.1 (decamelize@1.2.0, y18n@3.2.1, lodash.assign@4.1.0, which-module@1.0.0, set-blocking@2.0.0, require-main-filename@1.0.1, window-size@0.2.0, require-directory@2.1.1, get-caller-file@1.0.1, yargs-parser@2.4.1, os-locale@1.4.0, cliui@3.2.0, string-width@1.0.1, read-pkg-up@1.0.1)
├── lodash@4.14.0
└── contentful-batch-libs@4.0.13 (contentful-management@1.1.9, contentful@3.5.0, babel-runtime@6.11.6)

Then run the following code:

const spaceExport = require('contentful-export')

const options = {
  spaceId: 'a_valid_space_id',
  managementToken: 'a_valid_mgmnt_token',
};

spaceExport(options)
  .then((output) => {
    console.log('space data', output)
  })
  .catch((err) => {
    console.log('oh no! errors occurred!', err)
  })

Throws the following error:

/exporter/node_modules/contentful-export/node_modules/contentful-batch-libs/utils/create-clients.js:34
    spaceId: opts.sourceSpace
                 ^

TypeError: Cannot read property 'sourceSpace' of undefined
    at createClients (exporter/node_modules/contentful-export/node_modules/contentful-batch-libs/utils/create-clients.js:34:18)
    at runContentfulExport (exporter/node_modules/contentful-export/dist/run-contentful-export.js:41:45)
    at Object.<anonymous> (exporter/index.js:9:1)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Function.Module.runMain (module.js:441:10)
    at startup (node.js:134:18)
    at node.js:962:3

Using the same SPACE_ID and MANAGEMENT_TOKEN in the CLI works correctly.

My use case is I’d like to create automatic backup AWS Lambdas to backup my Contentful spaces, and the CLI tool is not an option in this context.