AstroJSX syntax [WIP]

[goulvenclech]

Changes

Astro expression syntax is similar to JSX, but it's not JSX. So, we need to create a new syntax for it, including the JSX syntax as a base, and adding some Astro-specific patterns over it.

This will allow us to fix some issues much more easily, such as #708 or #714 . Also, the syntax will match the actual behaviour of Astro expressions, like basic HTML comments - not supported by JSX in expressions, but Astro does.

Testing

Will be tested. I swear.

Docs

N/A, this PR will make the syntax match the actual behaviour of Astro expressions. But the code is commented.

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Latest commit: 9ebaa55

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