@grain/js-runner NPM

@grain/js-runner

The JavaScript runner for the Grain language.

Why

This project makes it easier to get your Grain programs running in a JavaScript environment—either Node.js or the browser. If your Grain code is compiled in unlinked mode (--no-link), @grain/js-runner will perform module resolution and load all necessary modules.

Installation

To install the package, install it from npm:

npm install @grain/js-runner

Usage

The package provides two versions of the runner. One for the browser and one for node.

In the browser, without a bundler, add this as a script to your index.html:

<script src="node_modules/@grain/js-runner/dist/grain-runner-browser.js"></script>
<script>
  // You'll also need to install the @grain/stdlib package
  let locator = Grain.defaultURLLocator(["/", "node_modules/@grain/stdlib"]);
  let GrainRunner = Grain.buildGrainRunner(locator);
  GrainRunner.runURL("hello.gr.wasm");
</script>

The easiest way to get running in the browser is to fork the grain-web-example.

In node, you can require the runner:

let Grain = require("@grain/js-runner");
let locator = Grain.defaultFileLocator([
  __dirname,
  require.resolve("@grain/stdlib"),
]);
let GrainRunner = Grain.buildGrainRunner(locator);
GrainRunner.runFile("hello.gr.wasm");

You can also just use the Grain CLI to run your files, like grain run hello.gr.wasm.