rir3

Execute Luau code inside Roblox Studio and see output in your terminal.

What it does

Run scripts in Roblox Studio from your command line. All Studio output (prints, warnings, errors) appears in your terminal with color coding.

Uses WebSockets to communicate between the CLI and Studio. rir3 once is functionally identical to run-in-roblox and can serve as a drop-in replacement.

Plans

File path + sourcemap reconciliation in execution for accurate stack traces Output timestamps + better output formatting Clickable output Output syncing (i.e. NexusSync) Cloud execution

Usage

One-off execution

Run a script once (no setup needed):

rir3 once demo/hello.luau

Optionally specify a place file:

rir3 once demo/hello.luau demo/Place.rbxlx

Persistent mode

For running multiple scripts without restarting Studio:

1. Build the plugin (once):

rir3 build

2. Start the server (terminal 1):

rir3 serve

3. Execute scripts (terminal 2):

rir3 exec demo/hello.luau

Writing scripts

Scripts have full access to Studio APIs:

print("Hello from Studio!")

local part = Instance.new("Part")
part.Parent = workspace

warn("This is a warning")