[WIP] TypeScript support in REPL

[bartlomieju]

Ref #1158

This is initial pass at implementing TypeScript support in REPL. It's quite complex task and we're aiming for MVP with this PR.

There are a few PR that might need to land before this one including:
#1136 #1165

cc: @kitsonk @hayd @ry

[bartlomieju]

@kitsonk PTAL any feedback would be much appreciated

[bartlomieju]

Right now I'm getting this diagnostic:

Option '--resolveJsonModule' cannot be specified without 'node' module resolution strategy.

Also since I used the same compiler options as for standard program execution which uses AMD, define is required to run the code (running any code results in: ReferenceError: define is not defined)

[hayd]

I wonder if the meat of this should move to vm.ts similar to node. https://nodejs.org/api/vm.html

[bartlomieju]

I've got basic compilation working, now is time for imports 👍

EDIT: ATM I'm not able to import any local module because in parse_local_or_remote containingFile is [repl].ts and Rust refuses to parse it.

[hayd]

before shipping, these should be util's log (hidden behind debug flag).

[bartlomieju]

Of course, just needed some guidance during debugging.

[hayd]

Is there a way to tease apart the compile and eval steps? I think that will enable a fix for #1174 (as well as potentially being cleaner).

[bartlomieju]

@hayd yes, that's what we're aiming for. Deno compiler will return compiled JS code and it will be up to REPL to execute it.

[hayd]

Is this waiting on #1136?

[kitsonk]

Actually I think we need to wait for #1190 which I am working on at the moment, but it is fairly complex. Once we have that, we can create a better incremental compiler too as well.

[ry]

Closing old PRs. I'm still not ready to address TS in the REPL - but now that native ES modules are landed we're much closer. Let's talk about it in a few weeks.