property Script.prototype.sourceMapURL
Usage in Deno
```typescript import { Script } from "node:node__vm.d.ts"; ```When the script is compiled from a source that contains a source map magic
comment, this property will be set to the URL of the source map.
```js
import vm from 'node:vm';
const script = new vm.Script(`
function myFunc() {}
//# sourceMappingURL=sourcemap.json
`);
console.log(script.sourceMapURL);
// Prints: sourcemap.json
```
string | undefined