Add a type-guard overload of Array.every - #38200

All CLA requirements met.

I've wanted this feature too, but it was pointed out in another issue that Array.prototype.every differs from Array.prototype.filter in that it does not return a new array, and other references mutate the underlying array in an incompatible way.

However, TS has other unsound narrowings, so maybe this should be a pragmatic exception? I'm not sure. Seems easy enough to wrap if you need it in a more sound way.

Overall LGTM. Can you fix the merge conflict so we can run some user tests?

TypeScript Bot (@typescript-bot) user test this
TypeScript Bot (@typescript-bot) run tests

Heya Nathan Shively-Sanders (@sandersn), I've started to run the parallelized community code test suite on this PR at b89c084. You can monitor the build here.

TypeScript Bot (@typescript-bot) run dt

Heya Nathan Shively-Sanders (@sandersn), I've started to run the parallelized Definitely Typed test suite on this PR at b89c084. You can monitor the build here.

TypeScript Bot (@typescript-bot) rwc test this

TypeScript Bot (@typescript-bot) test this

Heya Nathan Shively-Sanders (@sandersn), I've started to run the extended test suite on this PR at b89c084. You can monitor the build here.

The user suite test run you requested has finished and failed. I've opened a PR with the baseline diff from master.

User tests are fine -- we caught vs code during a build break, but otherwise there's nothing there.