solve/static/app.js


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import { wrap, proxy } from './comlink-4.3.1.js';

report.onclick = () => { location.pathname = '/report' };

window.sandbox = new class {
    box = wrap(new Worker('sandbox.js', { type: 'module' }));
    run(code) {
        return new Promise(async (resolve, reject) => {
            const errorHandler = proxy(reject);
            const result = await this.box.run(code, errorHandler);
            resolve(result);
        });
    }
}();

const query = new URLSearchParams(location.search);
const code = query.get('code') ?? '7*7';
let tmp = await window.sandbox.run(code);
console.log(tmp);
output.textContent = tmp;