Dynamically generate types from compile and traverse

[ignatiusmb]

Only fixed set of types are exposed but it doesn't really describe the actual file's front matter. Ideally, these front matter properties are available to use after compilation. Right now, they need to be manually typed by the user so any changes or updates to the front matter needs to be updated to the type as well, which is nice strictly speaking, but not ideal as this should generally be dynamic.

The general idea is to

1. Generate .d.ts from JSON object, straight from the return value of compile and traverse, which means a separate function. Or even inside of them, passed as an option.
2. Place generated *.d.ts in a locally cached folder (needs to be gitignored), or inside node_modules (if it's possible) and somehow make TypeScript aware of it and correctly captures the types in relation to the directory path, or just make them globally available to be imported

[ignatiusmb]

This could probably be added as a patch or enhancement.