Allow multi-line REPL prompts like node

[blakeembrey]

Node appears to handle this by detecting syntax errors. I can probably catch compilation errors and check the error codes are syntax errors too and recover from that.

Relevant: https://github.com/joyent/node/blob/d13d7f74d794340ac5e126cfb4ce507fe0f803d5/lib/repl.js#L125-L129

[Igorbek]

@blakeembrey hey, do you have any update on this?

[blakeembrey]

See the linked issue in node.

[robey]

Looks like this still exists in ts 2.0.

[blakeembrey]

Yes, it's unrelated to TypeScript. There's nodejs/node#6171 still pending to support this.

[blakeembrey]

Ok, I've implemented basic support for recoverable errors. There may be edge cases until nodejs/node#6171 lands, but I've manually coded the recoverable TypeScript diagnostic codes into https://github.com/TypeStrong/ts-node/blob/master/src/_bin.ts#L362-L369 for now. If you find something that you think should work, let me know and it can be added to the list.

Edit: Remember, this'll only work on node 6+ as that's when the recoverable error export landed.