std/node: add buffer module

[EvanHahn]

For completeness, we should add a polyfill for Node's buffer module.

[jamilservicos]

I believe that many depend on Buffer.
so publishing an alternative to the nodejs buffer commands, could open the door to many migrations and adaptations.
mainly for encryption modules.

but it doesn't have to be exactly a compatibility for the nodejs Buffer, being the same done in C, the deno could include its own version in the native module with aliases for the already known methods, to facilitate the migration from one language to another.

[seishun]

I'm currently working on it.

[ahuggins-nhs]

@seishun I'd like to contribute, but I find the current work on an implementation a little confusing. I'm trying to understand what the goal is, because I don't understand if the effort is simply to polyfill, or if the effort is to also depend on decoders/encoders provided in deno's std lib.

A polyfill exists currently; is there a good reason to roll all "new" code for this instead of porting the previous art with its permissive license? Can you help me understand the direction?

Once I can wrap my head around that, I'll have a better idea of how to spend efforts contributing.

Edit: this will go a long way toward porting EDI/AS2 libraries I wrote for Node that I now regret tangling up in Node's streaming pattern(s). Having a Buffer implementation will make it easier to port cross-platform; at that point, all I'll need to do is kill the Node stream support in favor of WhatWG Streams.

Edit2: I also see this issue: #3403 and I'm wondering if discussion should be done over there instead?

[stale]

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