TypeScript

[mbostock]

Reboot of #129. Fixes #79.

TODO

• [x] ```ts fenced code blocks
• [x] ```tsx fenced code blocks
• [x] .ts modules
• [x] .tsx modules
• [x] TypeScript in inline expressions (not supported)
• [x] verbatimModuleSyntax to preserve imports
• [x] documentation
• [x] tests

Unlike #129, I expressly avoided allowing TypeScript in inline expressions, which allows us to avoid running the esbuild transform on them, and in turn avoids the problem of esbuild converting expressions to expression statements and then losing implicit display. Not also that there is no implicit display in ```ts blocks. I think this is an acceptable tradeoff, at least for now, as you get the primary benefits of TypeScript modules and TypeScript fenced code blocks and only if you explicitly opt-in to using TypeScript.

Also unlike #129, this only allows TypeScript to be imported with the .js, as we do for .jsx. This is the recommended practice because it means the import path doesn’t change after transpilation.

[Fil]

The next release is going to be HUGE!

[mpj]

oh my