Thank you for the reply. :)
Will revise my code

Is this a bug or did I just misunderstood something?
I tried to console.log the output within parse() and it seems like I get correct char, word, and line counts (on the initial test case: "Once upon a time")

This error shows upon Test (not on submit)

TypeError: Cannot read properties of undefined (reading 'getChunk')
    at DocumentParser.parse (test.js:54:21)
    at Context.<anonymous> (test.js:93:12)
    at process.processImmediate (node:internal/timers:471:21)

Appreciate any feedback :)