Possibility of emitting binary AST and accepting binary AST

[jfrolich]

Currently, it's not possible to emit a binary AST or accept a binary AST using the rescript format command line tool. I am working on a more tightly integrated version of graphql-ppx and it is now dependent on refmt for this (and thus is in ReasonML instead of ReScript). This is necessary for snapshot testing. To properly test the ppx I need to go from source code -> binary AST -> ppx -> binary AST -> source code. An example on how this can be achieved with refmt is the following command:

refmt --parse re --print binary operations/customDecoder.re | ppx.exe /dev/stdin /dev/stdout | refmt --parse binary --print re

Other solutions are also welcome, but without snapshot testing, it's really hard to know if a ppx is behaving correctly.

Are you open for a PR to achieve this? (even if it's undocumented that would be fine)

[amiralies]

you probably can use syntax repo. it emits an executable that prints/parses binary ast.

[jfrolich]

Nice. I'll probably do that, but I would need to vendor it because I want to have 0 (OCaml) dependencies. So I still would rather have this functionality as part of the rescript compiler.

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