Cannot break generic parameter declarations into multiple lines about marko

[AngusMorton]

My understanding is that this is a limitation/issue in the htmljs parser. There is no native representation of import/export in the parser, they are parsed as concise mode tags.

One solution would be to give the htmljs-parser the ability to parse import and export statements natively. There may be an easier fix, but I don't have a good enough understanding of the htmljs-parser to know!

[DylanPiercey]

@AngusMorton @svallory the htmljs parser tries hard not to do a full parse of the javascript sections of code. For import, export and friends they are parsed in "statement" mode (previously it was parsed as a concise mode tag but now it goes directly into our expression parsing similar to attribute values).

When the parser is scanning for the end of an expression it will skip over strings, matched bracket pairs, regexps and some javascript operators and keywords. The problem is that this logic does not currently account for generics and since the statement parse state exits when there is a newline (assuming the expression isn't continued because of being a string, bracketed, etc) it will error when you have multiline generics outside of a bracketed section.

We need to think of a good way to make the parser aware of generics, while still allowing it to do as little processing as possible.

[svallory]

@DylanPiercey I don't see many options other balancing < in htmljs like it does for other tokens in EXPRESSION.ts. The trick part will be differentiating a "less than" from a generic section start.