This involves a huge refactor for how battles are constructed, but
it's totally worth it.
Currently, tournaments, challenges, and laddering are unsupported; only
unrated searches work. But it does work, and it's beautiful.
Matchmaking unit tests currently rely on destroying and re-creating a
user causing them to forget about battles they're in, which is not
actually supposed to happen, and breaks #7815.
It turns out that when I switched us from `assert` to `assert.strict`,
I didn't actually update any existing tests or tell anyone:
0df0d234f2
So apparently everyone else just kept on using `strictEqual`.
This will be a PR and also throw an error if people continue trying to
use it, which should make it much clearer what PS policy is on this.
A lot of the problem may be that TypeScript marks assert.strict.equal
as deprecated when it's not. This was fixed 4 days ago:
https://github.com/DefinitelyTyped/DefinitelyTyped/pull/48452
But this probably hasn't made it to a thing yet. Until then, you'll
have to deal with TS marking your tests as deprecated, but it shouldn't
be too long.
Accidentally using `assert` instead of `assert.strict` should now show
an error. This protects against the probably much worse mistake of
accidentally using `assert.equal` rather than `assert.strict.equal`.
`assert.ok` is also deprecated now.
NOTE: This is changes the semantics of `hidenext`/`ionext` from
applying to the next created *battle* to applying to the next
created *search*/*challenge*.
Not having prefer-const on the JS side makes JS -> TS refactors really
unreadable. This commit just auto-fixes it so we're using
`prefer-const` everywhere.
