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Use dart:js_interop, extension types, and fetch() to send HTTP(s) requests from inside WASM

Instructions for this devcontainer

Tested with Dart SDK v3.5.2, Bun 1.2.4, Deno 2.2.3, Node.js 23.9.0, Chrome browser v133.0, and Firefox browser v135.0 .

Preparation

  1. Open this repo in devcontainer, e.g. using Github Codespaces. Type or copy/paste following commands to devcontainer's terminal.

Installation

  1. cd into the folder of this example:
cd browser-and-node-js_interop-extension_type-fetch
  1. Ensure all dependencies are installed:
dart pub get

Building

  1. cd into the web subfolder, where sources are located:
cd web
  1. Compile the example:
dart compile wasm main.dart

Test with browser

  1. Run simple HTTP server to temporarily publish project to Web:
python3 -m http.server

Codespace will show you "Open in Browser" button. Just click that button or obtain web address from "Forwarded Ports" tab.

  1. As index.html and a 60k-sized wasm file are loaded into browser, refer to browser developer console to see the results.

Test with Node.js

  1. Run with Node.js:
node node-and-deno.mjs

Test with Bun

  1. Install Bun:
curl -fsSL https://bun.sh/install | bash
  1. Run with Bun:
~/.bun/bin/bun node-and-deno.mjs

Test with Deno

  1. Install Deno:
curl -fsSL https://deno.land/install.sh | bash -s -- --yes
  1. Run with Deno:
~/.deno/bin/deno run --allow-read --allow-net node-and-deno.mjs

Finish

Perform your own experiments if desired.