Switch all functions to run synchronously

[ridafkih]

Removes all asynchronous functionality from the library.

Feel free to not merge, if it's not something you want to implement. I'm sure you had your reasons for going fully asynchronous (performance?). For myself, I'm setting up a custom integration with your (great) library which integrates directly into my app.config.ts, but this library doesn't play well because the configuration cannot return a promise, and cannot resolve as a module (meaning no top-level asynchronous functionality).

I'll re-release this under my own namespace for personal use, and switch it over if you decide to merge this in. c:

Note, this would constitute a major version bump.

[ridafkih]

No dice, the performance just wasn't going to cut it for my implementation, asynchronous is really required for this library with the current implementation. I was unable to reliably hash with a compiled package made from this PRs code, it would sometimes take minutes at a time. I did go ahead and make my own spin on a native dependency hashing library. On a relatively fresh Expo project, I'm able to get ~3.5K files hashed into an MD5 hash in about 460ms.

The repository can be found at ridafkih/dephash, and it's on NPM @ dephash

It uses glob to check for a series of patterns, puts those all in a list, instantiates a single hash, iterates over it and gets the Buffer that represents the contents each matched file, updates the hash iteratively, and then digests it once all files have been included. By employing some of that here, we could likely improve the performance tremendously.

[robertherber]

@ridafkih Looks nice with a faster file processing approach, would you like to open a PR on this? :) Is it also taking into account whether the files are gitignored or not?