"Hello world" JavaScript Plugin

[nbouvrette]

I was just trying out the SWC plugins (JavaScript, not Rust) and maybe I am missing something but documentation is hard to find. I tried to do this "Hello world" plugin and I am getting an odd error. Can anyone help?

import { Module, plugins, Program, transformSync } from '@swc/core';
import Visitor from '@swc/core/Visitor.js';

class testVisitor extends Visitor {
  visitModule(module: Module): Module {
    module.body.forEach((content) => {
      console.dir(content);
    });

    return module;
  }
}

function testPlugin() {
  return (program: Program) => new testVisitor().visitProgram(program);
}

const input = `const hello = "world";`;

const output = transformSync(input, {
  plugin: plugins([testPlugin()]),
});

console.log(output);

This triggers:

hello-world\lib\swc-plugin\index.js:23
        return _super !== null && _super.apply(this, arguments) || this;
                                         ^

TypeError: Class constructor Visitor cannot be invoked without 'new'
    at new MessageModulesTransformer (hello-world\lib\swc-plugin\index.js:23:42)
    at hello-world\lib\swc-plugin\index.js:34:40
    at hello-world\node_modules\@swc\core\index.js:78:17
    at Compiler.transformSync (hello-world\node_modules\@swc\core\index.js:220:43)
    at Object.transformSync (hello-world\node_modules\@swc\core\index.js:325:21)
    at Object.<anonymous> (hello-world\lib\swc-plugin\index.js:37:19)
    at Module._compile (internal/modules/cjs/loader.js:1085:14)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
    at Module.load (internal/modules/cjs/loader.js:950:32)
    at Function.Module._load (internal/modules/cjs/loader.js:790:12)

[guiled]

Hi ! I managed to run your test