Hi there, thank you for publishing such a great project! I've just been getting a demo up and running using Visual Studio 2017 (using standard VS templates). By default, the VS/webpack toolchain will append a version hash query string to its script bundle references. e.g:

http://localhost:59090/dist/main.js?v=hyw4nPT-JXNYaAsGUUqAfkThIaWT7qch0FVyfgwK9zg

The ScriptPath object purposefully throws an exception in order to extract the script path from the stack trace. A regular expression is used to extract the path components. The expression does not expect a query string in the script path.

In my particular case, the stack trace string with the query string on the script path looks like this:

    at Object.module.exports (http://localhost:59090/dist/main.js?v=0gN5LBVFBXS_KkM6Si37YaPTqhTdNsQRWgUcbcGODYs:2884:211)

This fails with error:

Uncaught TypeError: Cannot read property '2' of null
    at ScriptPath.path (perspective.view.js:1)
    at ScriptPath.host (perspective.view.js:1)
    at Object.worker (perspective.view.js:2)
    at get_worker (perspective.view.js:1)
    at HTMLElement.load (perspective.view.js:1)
    at HTMLElement.value (perspective.view.js:1)
    at HTMLDocument.<anonymous> (Home.tsx:24)
    at webcomponents.min.js:14

If we purposefully omit the query string like so:

at Object.module.exports (http://localhost:59090/dist/main.js:2884:211)

It works.

As a fix we can update the regular expression to lazily match any character 0 or more times between the file extension (js|html) and the first instance of the colon character (which in this context, indicates the end of the path).

I applied this fix in my local development environment and had no further issues and also confirmed with a web-based visual regular expression debugger that both forms are correctly parsed.

Thanks!