engine262 VS m4b-tool

engine262

Indeed. ECMA-262 has been implemented using JavaScript https://github.com/engine262/engine262.

Node.js is not the only JavaScript runtime. JavaScript runtimes have been written using JavaScript alone, see engine262. There is also Deno, QuickJS, txiki.js, Bun, none of which use COmmonJS by default, SpiderMonkey, et al.

for an interpreted language like JS, this project is really nice https://github.com/engine262/engine262. More or less 2 parts: parser and evaluator

That is a bit complex, so here's a list of JS engines: if you pick one written *in* JS, that would probably be most useful -- engine262 for example

then you might be impressed by https://github.com/engine262/engine262 as well

Engine 262

It's outside of what you asked for, but here's a JavaScript engine in JavaScript. Might make for some interesting bedtime reading!

Interesting to see a JS implementation written in JS:

https://github.com/engine262/engine262/

(The readme explains what the point of it is.)

I’ve been using https://github.com/sandreas/m4b-tool for years to combine files into m4b, add cover and metadata. I also use iOS and prologue for listening.

MP3Merge, m4b-tool. This one is interesting for iOS users.

Look into m4btool (https://github.com/sandreas/m4b-tool). Audiobookbinder increases the m4b filesize. Followed this post for my own purposes: https://apple.stackexchange.com/questions/426094/convert-multiple-mp3-files-or-single-m4a-into-m4b-with-ffmpeg-and-afconvert

M4B-tool which wraps ffmpeg might be your best bet if you are planning on converting m4b’s.