sema-docs 1.20.3

Canonical structured documentation for Sema builtins/special forms; powers LSP hover/completion and REPL apropos
Documentation 
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---
name: "sys/interactive?"
module: "system"
section: "Session Information"
---

Test if stdin is a TTY (i.e., running interactively).

```sema
(sys/interactive?)   ; => #t in REPL, #f in scripts
```