Module builtin_fns 

The builtin surface every host shares, described once as ScriptFns. The builtin surface every script host shares, described once.

A builtin whose whole body is “push one ScriptCommand” or “read one process-global and return it” says nothing about the language calling it, so it lives here as a ScriptFn rather than three times over in the host crates. Each host binds this table through its own ScriptHost::register_script_fn when it is constructed, so a bare host in a test, in lumenc check, or in a server render carries the same builtins a windowed app does.

What stays in a host crate is what a host cannot share: the signal mirror and its handle types, closure registries (on, derive, event handlers), anything whose return shape differs per language, and the receiver-method surfaces (node.set_text(..)) each engine spells its own way.

Functions

builtin_script_fns

The whole shared builtin table, in registration order.

parse_dialog_filter_spec

Parse a pick_file_filtered spec like "Images:png,jpg|All:*" into the (label, [extensions]) list the dialog backend takes. A group with no : is a label with no extensions, and a literal * extension is dropped (no extension filter means “all files”).