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*current-file* (keyword)

*current-file* is bound to the keyword :current-file—it provides a global alias to the dynamic binding containing the path of the currently compiling file.

• Official Docs
• JanetDocs

repl> (root-env '*current-file*)
@{:doc "Bound to the name of the currently compiling file."
  :dyn true
  :source-map ("boot.janet" 1343 1)
  :value :current-file}

Things I Learned

• Dynamic bindings are just keyword/value pairs in the current fiber’s environment.
• As a consequence, some standard library functions (e.g., run-context), that operate on a provided environment use (put env key val) rather than setdyn to set dynamic values.
• By contrast, setdyn is implemented as a C function that essentially performs the equivalent put operation on the current fiber’s environment via direct access to the VM and fiber data structures (presumably for performance).

Created: Tuesday October 14, 2025 @ 11:25:23 PM EDT