@sebastianwessel/quickjs/dist/esm/sandbox/expose/isES2015Class.js

A typescript package to execute JavaScript and TypeScript code in a WebAssembly QuickJS sandbox

const classRegex = new RegExp(/^class\s/);
export function isES2015Class(cls) {
    return typeof cls === 'function' && classRegex.test(Function.prototype.toString.call(cls));
}