Calling systemDocumentsIdDownloadGet() throws SyntaxError

[TroyMorvant]

When I try calling the function below:

const data = await this.api.systemDocumentsIdDownloadGet({id: document.id});

It throws the following:

SyntaxError: Unexpected token � in JSON at position 0

at JSON.parse ()
at /Users/troymorvant/Projects/FN/integrations/integration-worker-
connectwise/node_modules/isomorphic-fetch/node_modules/node-fetch/lib/body.js:46:16
at process.internalTickCallback (internal/process/next_tick.js:77:7)

Shouldn't fetch() return a buffer for files rather than attempting to parse the response as json?