feat(export-to-language) add Swift support as a target language for export SWIFT-1458

[patrickfreed]

Description

This adds a Swift target for the language transpilation, enabling export for find and aggregate pipelines.

Checklist

• [x] New tests and/or benchmarks are included
• [ ] Documentation is changed or added

Motivation and Context

• [ ] Bugfix
• [x] New feature
• [ ] Dependency update
• [ ] Misc

Types of changes

• [ ] Backport Needed
• [ ] Patch (non-breaking change which fixes an issue)
• [x] Minor (non-breaking change which adds functionality)
• [ ] Major (fix or feature that would cause existing functionality to change)

[kmahar]

LGTM from the Swift perspective excluding the conversation above about type annotations with the open question for DevTools

[kmahar]

@mcasimir and team, this should be ready for your review whenever you get a chance

[gribnoysup]

Looks awesome! There are some conflicts introduced by another language support that was added recently, do you mind resolving?

[gribnoysup]

Seems like the test failures are not just flakes, but relevant to the changes (a few expected outcomes are missing in the tests it seems?)

[2022/05/03 21:43:21.008] bson-transpilers:   1) native
[2022/05/03 21:43:21.008] bson-transpilers:        Tuple
[2022/05/03 21:43:21.008] bson-transpilers:          python: ('1', { 'settings': 'http2' }) => swift:
[2022/05/03 21:43:21.008] bson-transpilers:       AssertionError: expected '[\n    "1",\n    [\n        "settings…' to equal '[\n    "1",\n    [\n        "settings…'
[2022/05/03 21:43:21.008] bson-transpilers:       + expected - actual
[2022/05/03 21:43:21.008] bson-transpilers:        [
[2022/05/03 21:43:21.008] bson-transpilers:            "1",
[2022/05/03 21:43:21.008] bson-transpilers:            [
[2022/05/03 21:43:21.008] bson-transpilers:                "settings": "http2"
[2022/05/03 21:43:21.008] bson-transpilers:       -    ]
[2022/05/03 21:43:21.008] bson-transpilers:       -]
[2022/05/03 21:43:21.008] bson-transpilers:       +    ]
[2022/05/03 21:43:21.008] bson-transpilers:
[2022/05/03 21:43:21.008] bson-transpilers:       at Context.eval (eval at constructJavascriptFunction (/data/mci/da21ab3dcd1e5d23d216d9cf3ffc8a0c/src/node_modules/js-yaml/lib/js-yaml/type/js/function.js:71:12), <anonymous>:7:14)
[2022/05/03 21:43:21.008] bson-transpilers:       at processImmediate (internal/timers.js:464:21)
[2022/05/03 21:43:21.009] bson-transpilers:   2) native
[2022/05/03 21:43:21.009] bson-transpilers:        Tuple
[2022/05/03 21:43:21.009] bson-transpilers:          python: ('1', ['2', '3']) => swift:
[2022/05/03 21:43:21.009] bson-transpilers:       AssertionError: expected '[\n    "1",\n    [\n        "2",\n   …' to equal ''
[2022/05/03 21:43:21.009] bson-transpilers:       + expected - actual
[2022/05/03 21:43:21.009] bson-transpilers:       -[
[2022/05/03 21:43:21.009] bson-transpilers:       -    "1",
[2022/05/03 21:43:21.009] bson-transpilers:       -    [
[2022/05/03 21:43:21.009] bson-transpilers:       -        "2",
[2022/05/03 21:43:21.009] bson-transpilers:       -        "3"
[2022/05/03 21:43:21.009] bson-transpilers:       -    ]
[2022/05/03 21:43:21.009] bson-transpilers:       -]
[2022/05/03 21:43:21.009] bson-transpilers:
[2022/05/03 21:43:21.009] bson-transpilers:       at Context.eval (eval at constructJavascriptFunction (/data/mci/da21ab3dcd1e5d23d216d9cf3ffc8a0c/src/node_modules/js-yaml/lib/js-yaml/type/js/function.js:71:12), <anonymous>:7:14)
[2022/05/03 21:43:21.009] bson-transpilers:       at processImmediate (internal/timers.js:464:21)
[2022/05/03 21:43:21.009] bson-transpilers:   3) native
[2022/05/03 21:43:21.009] bson-transpilers:        Tuple
[2022/05/03 21:43:21.009] bson-transpilers:          python: ['1', ('2', '3')] => swift:
[2022/05/03 21:43:21.009] bson-transpilers:       AssertionError: expected '[\n    "1",\n    [\n        "2",\n   …' to equal ''
[2022/05/03 21:43:21.009] bson-transpilers:       + expected - actual
[2022/05/03 21:43:21.009] bson-transpilers:       -[
[2022/05/03 21:43:21.009] bson-transpilers:       -    "1",
[2022/05/03 21:43:21.009] bson-transpilers:       -    [
[2022/05/03 21:43:21.009] bson-transpilers:       -        "2",
[2022/05/03 21:43:21.009] bson-transpilers:       -        "3"
[2022/05/03 21:43:21.009] bson-transpilers:       -    ]
[2022/05/03 21:43:21.009] bson-transpilers:       -]

[patrickfreed]

Oh whoops, looks like some of the test assertions got messed up during the merge. Should be fixed now and ready for review.

[mcasimir]

I'm going to close this PR for the time being as it has been inactive for a while by now. We can always re-open it if we want to get some progress