native-messaging-quickjs VS requestNativeScripts

QuickJS https://github.com/guest271314/native-messaging-quickjs (after strip the executable is less than 1MB; the last time I checked node executable is well over 80MB) to run ImageMagick and pipe the result to local file system, remote end-point, or to the browser as a stream.

Dynamically set arbitrary Web pages as "externally_connectable" and forward messages from the Web page to Native Messaging host the forward messages from Native Messagin host back to arbitrary Web page https://github.com/guest271314/native-messaging-quickjs/tree/dynamic-externally-connectable

I can ship qjs in a browser extension with no undue constraint on storage, and run qjs from the browser from any Web site https://github.com/guest271314/native-messaging-quickjs/tree/dynamic-externally-connectable. That is a different story for node and deno, when we really analyze the built-ins we use, do not amount to all of the built-ins, however, there is no way that I am aware of to reduce the size of V8 engine; even d8 is what, 20MB, and not simple to extend to actually use stdin, stdout.

Working JavaScript (QuickJS) version: https://github.com/guest271314/native-messaging-quickjs/blob/main/nm_qjs.js

A QuickJS Native Messaging host that echoes input https://github.com/guest271314/native-messaaging-quickjs from client. Have fun.

That is already possible using just window.open() with a local server or WebRTC, or Web Bluetooth, or WebTransport, or Fetch, e.g., without using extension code https://github.com/guest271314/requestNativeScripts/blob/master/Explainer.md, and with extension code using Native Messaging https://github.com/guest271314/sw-transfer-stream, https://github.com/guest271314/offscreen-webrtc.

Technically you can use a variety of means to execute arbitrary shell scripts. One approach is to use inotifywait to check for file changes, which can be written to local filesystem using File API and where implemented File System Access API, for an overview of this particular approach see https://github.com/guest271314/requestNativeScripts/blob/master/Explainer.md, for implementation see https://github.com/guest271314/captureSystemAudio#usage, where I use the process to execute PulseAudio's parec to capture system audio and stream the raw PCM to the browser in real-time by opening and closing local files.