Add a type-guard overload of Array.every

[dmitri-gb]

This adds a type-guard aware overload of Array.every.

Fixes #14963.

[msftclas]

All CLA requirements met.

[keithlayne]

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.

[RyanCavanaugh]

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

[sandersn]

@typescript-bot user test this
@typescript-bot run tests

[typescript-bot]

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

[sandersn]

@typescript-bot run dt

[typescript-bot]

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

[sandersn]

@typescript-bot rwc test this

[sandersn]

@typescript-bot test this

[typescript-bot]

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

[typescript-bot]

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

[sandersn]

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