Expose and hook into REPL eval

[blakeembrey]

While building the REPL for https://github.com/TypeStrong/ts-node, I'd love to be able to push people toward using node -r ts-node/register for any advanced node.js usage and the one remaining feature to support the REPL. Would it make sense to expose the "default" REPL eval for override and createInternalRepl in some way so projects like the babel CLI and ts-node can hook into and replace the default eval and/or replicate createInternalRepl?

[addaleax]

Just to make sure I’m understanding this correctly, what you would like is essentially for just running ts-node (no args) to be equivalent to running node -r ts-node/register (no further args) – right?

[blakeembrey]

@addaleax Yes, that's the idea 👍 Right now it'd kick into the node.js REPL, so it'd be great to hook into that behaviour and wrap evaluation. One thing that would be relevant to the implementation would be support for chaining the evaluations, so the current "default" might need to be exposed somehow like require.extensions is. This would allow node -r ts-node/register -r babel-register to act the same in the REPL as with module code (if both modules support the new API).

[BridgeAR]

There has not been no further traction since opening the PR. Therefore I am going to close this as it is not foreseeable that we implement anything like it soon. Please reopen / leave a comment if you believe this should stay open.