tm.listeners

A tiny in-resource event bus. Shared. Nothing crosses a resource boundary: use events or exports for that.

local function onChange(value) print(value) end

tm.listeners.add('volume', onChange)
tm.listeners.invoke('volume', 5)    -- true (a listener existed), calls onChange(5)
tm.listeners.remove('volume', onChange)
tm.listeners.invoke('volume', 5)    -- false

Function	Notes
add(type, cb)	Registers cb for type. Adding the same function twice keeps one entry.
remove(type, cb)	Removes it. Unknown names and functions are ignored.
invoke(type, ...)	Calls every listener in registration order. Returns true when at least one existed.

A listener that errors is logged with tm.log.error and skipped, so one bad listener never blocks the others. Listeners may add or remove listeners while an invoke is running: the run in progress is not disturbed.