A typescript library for running starlark-go in the browser using WebAssembly.
npm install starlark-wasm
import { Starlark } from "starlark-wasm";
import wasmUrl from "starlark-wasm/wasm?url";
const exampleCode = `
def hello_world(name):
print("hello " + name)
return 42`;
// load the wasm module
Starlark.init(wasmUrl);
// instantiate a new starlark runtime, defining a load and print function
const starlark = new Starlark({
// load gives you module loading
load: async (filename) => {
const files = {
"main.star": exampleCode,
};
return files[filename];
},
// print to a console
print: (message) => {
console.log(message);
},
});
const returnValue = await starlark.run(
"main.star", // the file to run
"hello_world", // the function to call
["starlark"], // the args for the function
{}, // the kwargs for the function
1 // maximum execution seconds before timeout
);
-
index.html
: A demo of using this library, running starlark in the browser -
go/
: The go code that compiles tostarlark.wasm
-
public/
: Wherestarlark.wasm
lives. Note: this is to be hosted and included as an asset in your project -
src/
: The typescript project
The WebAssembly code adds a wasm_runner
function a window.starlark
global. This global object also has the underlying print
and load
functions which wasm_runner
calls during execution. Calling run
on a Starlark
instance also registers an execution thread with this global object, so that when the underlying load
and print
functions are called, they can invoke the respective functions on the relevant instance. This allows you to set up multiple runtimes/projects and call starlark functions on them independently, e.g. loading from different file structures or printing to different consoles.
-
Build
starlark.wasm
npm run build-go
-
Build the typescript project
npm run build
-
Run the demo
npm run dev
Borrowed concepts and inspiration from https://github.com/HarikrishnanBalagopal/starlark-webasm