Avoid SolidFetchBuilder returning undefined?

[mielvds]

The fetch var in SolidFetchBuilder is allowed to be undefined:

Bashlib/src/authentication/CreateFetch.ts

Line 44 in d4c82f0

private fetch: undefined | ((input: RequestInfo, init?: RequestInit | undefined) => Promise<Response>);

This is difficult to work with in typescript, since you need to include checks. However, authenticateToken(options); and authenticateInteractive(options) return a SessionInfo, which does not allow fetch to be undefined.

I was wondering whether

• the methods buildFromClientCredentialsToken and buildInteractive cannot simply return the SessionInfo object and/or
• default to nodefetch when undefined

On a more general note: what's the added-value of the SolidFetchBuilder class to these methods?

[Dexagod]

The goal of this builder was to centralize the location where the refreshing of the sessions can be handled, through I have not yet gotten to this, and this might not have been an ideal solution.