Add a way to specify which browser vivify should open.

[jannis-baum]

Close #291

[tuurep]

yarn test fails on main too (not related to this PR)

[tuurep]

A lead:

yarn test is this:

node --loader ts-node/esm --test tests/unit/cli.ts tests/unit/alerts.ts

It fails with something like:

node:internal/modules/run_main:107
    triggerUncaughtException(
    ^
[Object: null prototype] {
  Symbol(nodejs.util.inspect.custom): [Function: [nodejs.util.inspect.custom]]
}

But if you run the two test files individually without the --test flag, they work, i.e.:

• node --loader ts-node/esm tests/unit/alerts.ts
• node --loader ts-node/esm tests/unit/cli.ts

What would that tell us?

[tuurep]

Anyways, looks good apart from the faulty JSON in docs!

[jannis-baum]

@tuurep can you reproduce yarn test failing locally? For me it runs without errors both on this branch as well as on main, outputs the following: test-output.txt

[jannis-baum]

Seems like the issue was caused by a node update and I still had the old version. Should be good now, let's merge #296 first and then this one afterwards (I already rebased on top of that one to check that everything works here as well)

[tuurep]

Ok, it works for me