Run in web

[elazarcoh]

This is intended as an replacement PR for #39 which got messed up with conflicts.

@jgclark @alkatar21 can you look at it? I added a vsix as well.

[jgclark]

I've been trying for 30 minutes to test this in one of the web test environments, using various methods listed at https://code.visualstudio.com/api/extension-guides/web-extensions#web-extension-tests.
I think it does install OK, but I can't get further to actually test it in use.
Which method did you use to test it @elazarcoh?

But the good news is that this PR runs OK for me locally, and doesn't exhibit the same single-digit highlighting problem as I was reporting on #39.

[elazarcoh]

vscode-test-web --browserType=chromium --extensionDevelopmentPath=$extensionLocation $testDataLocation
described in https://github.com/microsoft/vscode-test-web.
this opens a web browser with vscode, in the given folder, where I put my .vscode/settings.json for testing.

We can add it in a launch.json to make it easier to debug.

[jgclark]

Thanks. Sounds like I'd been doing the right thing. I'd tried a variety of browserTypes as well, given the following warning about Playwright which I couldn't get to go away. I consistently get variations of this error (when running from my local GH directory with the vsix file in):

vscode-test-web --extensionDevelopmentPath=. .
@vscode/test-web: 0.0.15
Serving dev extensions from /Users/jonathan/GitHub/vscode-todo-highlight
Serving local content /Users/jonathan/GitHub/vscode-todo-highlight at /static/mount
Listening on http://localhost:3000
(node:47141) UnhandledPromiseRejectionWarning: browserType.launch: Executable doesn't exist at /Users/jonathan/Library/Caches/ms-playwright/chromium-907428/chrome-mac/Chromium.app/Contents/MacOS/Chromium
╔═════════════════════════════════════════════════════════════════════════╗
║ Looks like Playwright Test or Playwright was just installed or updated. ║
║ Please run the following command to download new browsers:              ║
║                                                                         ║
║     npx playwright install                                              ║
║                                                                         ║
║ <3 Playwright Team                                                      ║
╚═════════════════════════════════════════════════════════════════════════╝
    at openBrowser (/opt/homebrew/lib/node_modules/@vscode/test-web/out/index.js:99:59)
    at open (/opt/homebrew/lib/node_modules/@vscode/test-web/out/index.js:76:27)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:47141) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:47141) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
^C

I then remembered I'm running node v14.x (a requirement on the other project I contribute to), so I switched up to node 19.9.0, and updated everything, and then I get Chromium spinning up on localhost:3000 without errors, but it only gives a blank screen without any hint of VSCode other than its favicon. Passing different folders for test data doesn't help.

[elazarcoh]

try to open the dev tools (f12) and see if there are errors that make sense