Support import.meta and import.meta.*

[aurium]

Allows to access import.meta and only if its property is meta.

The new token IMPORT_META was created to allow richer formatting and code analysis.

$ ./bin/coffee --tokens -e 'import.meta.something'
[IMPORT_META import] [. .] [PROPERTY meta] [. .] [PROPERTY something] [TERMINATOR \n]

closes #5317

[GeoffreyBooth]

This looks very clean. @helixbass?

[vendethiel]

Maybe not important, but this breaks indented property access like

a = import
 .meta

# or (forgive me...)
a = import.
  meta

[aurium]

@vendethiel, now it can. Thanks!

[GeoffreyBooth]

this breaks indented property access

The same is true of new.target, so if we allow it for import.meta we should allow it there too.

I'm conflicted, as these aren't actually properties of an object the way that obj.prop is. import isn't an object, nor is it a function (even though it can appear like one e.g. import()). It's just a weird piece of syntax. Though I suppose the 'property access' is a part of grammar, and import.meta/new.target uses that grammar, so maybe it should follow that pattern?

[helixbass]

@aurium this is mostly looking good, see comments

And please add AST tests to test/abstract_syntax_tree.coffee and test/abstract_syntax_tree_location.data.coffee (you can add tests under the existing MetaProperty node tests if you want - again you should be able to use the new.target tests as a reference, though for import.meta you don't need to nest inside a function body if you don't want)

I'm happy to re-review once comments are addressed

[vendethiel]

@aurium I meant the approach in general is different from how this is usually done. Might not matter in this specific case (because it's not gonna be an issue in practice), but you're always gonna break some code if you "revert" to regex scanning.

b.
  # Here's a nice comment about the meta property
 c

See @helixbass 's comment on "retroactively updating a token"

[GeoffreyBooth]

@helixbass I added your excellent explanation as a comment in afab371 on this branch.

@aurium I merged the latest master into this branch. This adds a new and improved CI that includes testing the browser compiler, and uses GitHub Actions.

Have all of the review notes been addressed?

[aurium]

I believe... yes.

[GeoffreyBooth]

I believe... yes.

Great! @helixbass and @vendethiel, do you have any more notes?

[vendethiel]

LGTM

[helixbass]

LGTM

[gcxfd]

when where release this version ?