Scala.js: Various JS interop fixes #9763
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Normally, annotations applied to a class have no business being replicated on a synthetic companion object. One exception was the `@alpha` method, which is supposed to apply as well. Instead of trying to identify those annotations without the symbols during `Desugar`, we change `erasedName` to go look on the companion class of synthetic module classes.
The `PrepJSInterop` phase is responsible for: * Performing all kinds of Scala.js-specific compile-time checks, and emitting the appropriate compile errors. * Perform some transformations that are necessary for JavaScript interop, notably generating exports forwarders. This commit ports all the functionality of `PrepJSInterop` from Scala 2, except the following: * Handling of `scala.Enumeration`s: it is unclear whether we still want to support that in the core, or if it should be handled by an optional compiler plugin in the future. * Exports: they will be done later. * Warnings about duplicate fields in `js.Dynamic.literal`: mostly because they are non-essential. The test cases are ported from the Scala.js compiler tests.
This is a forward port of the upstream commit scala-js/scala-js@3c3b100 We now require the option `-scalajs-genStaticForwardersForNonTopLevelObjects` to emit static forwarders for non-top-level objects. In addition, we take `-XnoForwarders` into account, which we were erroneously not doing before.
This is a forward port of the upstream commit scala-js/scala-js@6c82635 Since dotc does not support warning suppression yet, we use a regular warning to report when we avoid emitting static forwarders.
And enable a number of tests that have been updated upstream to be compatible with dotty.
This is a forward port of the back-end changes in the upstream commit scala-js/scala-js@a1a27f2
This is very important, as it prevents `SelectStatic` from creating dangling references to global scope objects. Such dangling references are invalid and trigger an error in the back-end.
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Sep 10, 2020
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Oops. I created this PR from the wrong branch. This is superseded by #9767. |
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Depends on
#9758 and#9725.