Hello all. I've got a proposal that I'd like to surface for consideration. I put this together after speaking a bit with Matteo Collina and @ljharb... The fundamental idea is to introduce a mechanism for zero-copy concatenation of ArrayBuffer in a way that allows the result to still be an ArrayBuffer that can be wrapped with a TypedArray. The explainer is here: https://github.com/jasnell/proposal-zero-copy-arraybuffer-list/blob/main/README.md

For a quick example:

const ab1 = new ArrayBuffer(10);
const ab2 = new ArrayBuffer(20);
const combined = ArrayBuffer.of(ab1, ab2);
const u8 = new Uint8Array(combined);

Here, combined is effectively a list of the component ArrayBuffer instances that is itself an ArrayBuffer.

The idea here is adapted from the very popular npm module bl which implements a similar idea around Node.js Buffer interface but in a way that still has a number of warts.

There is a more detailed example in the explainer. @littledan and ljharb have already graciously provided some extremely helpful feedback.