Using ilp-packet in nodejs.sh

[michiel@mbp ~]$ mkdir exampleForDavid
[michiel@mbp ~]$ cd exampleForDavid/
[michiel@mbp ~/exampleForDavid]$ npm install ilp-packet
npm WARN saveError ENOENT: no such file or directory, open '/Users/michiel/exampleForDavid/package.json'
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN enoent ENOENT: no such file or directory, open '/Users/michiel/exampleForDavid/package.json'
npm WARN exampleForDavid No description
npm WARN exampleForDavid No repository field.
npm WARN exampleForDavid No README data
npm WARN exampleForDavid No license field.

+ [email protected]
added 5 packages in 1.112s
[michiel@mbp ~/exampleForDavid]$ ls
node_modules		package-lock.json
[michiel@mbp ~/exampleForDavid]$ node
> const IlpPacket = require('ilp-packet')
undefined
> IlpPacket.serializeIlpPrepare({ amount: '123', executionCondition: crypto.randomBytes(32), expiresAt: new Date(), destination: 'g.fuelling.david', data: Buffer.from([])}).toString('hex')
'0c4b000000000000007b3230313830323238313630393337313336a60c5dc975d7f8039f266abcb1c692cff2954d0a58927b61e42f4d67eefc396710672e6675656c6c696e672e646176696400'
>

IlpPacket.serializeIlpFulfill({ fulfillment: crypto.randomBytes(32), data: Buffer.from([])}).toString('hex')
'0d21e331a376641320c27398771e5df15c6ff8d8fb1c7cbf3cd500d596d300fe5efc00'