Options

Options go at the top of a schema, before any declaration, as option Name = Value. Each may be set once, or once per profile. The Options page explains each one in full.

Option	Value	Default	What it does
Casing	Pascal, Camel or Snake	Pascal	Casing of the generated methods: FireAll, fireAll or fire_all.
ServerOutput	path string	none; required by the CLI	Where the server module is written, relative to the schema.
ClientOutput	path string	none; required by the CLI	Where the client module is written.
TypesOutput	path string	none	Where a shared module with the schema’s types and exported Read/Write pairs is written. Not written when unset.
Typescript	boolean	false	Also write a .d.ts beside the server and client modules. CLI only.
UsePolling	boolean	false	Give every event the polling API (Iter), as if each were Call: Polling.
FutureLibrary	Luau path string	none	What require loads for Yield: Future. Required by any such function.
PromiseLibrary	Luau path string	none	What require loads for Yield: Promise. Required by any such function.
SyncValidation	boolean	true	Warn when a Sync listener yielded, and discard the rest of the packet it held up.
WriteValidations	boolean	false	Check types, ranges and Instance classes on send. Length bounds are checked on send regardless.
ManualReplication	boolean	false	Do not flush reliable traffic on Heartbeat; call StepReplication yourself.
RemoteScope	string	none	Prefix for the remotes’ names: "PKG" gives PKG_BLINK_RELIABLE_REMOTE.
MaxPacketSize	whole number	8192	Largest inbound packet the server reads, in bytes.
MaxEventsPerPacket	whole number	64	Events the server decodes from one packet before dropping the rest.
MaxInstancesPerPacket	whole number	256	Instance and unknown values one inbound packet may carry.
InboundBytesPerSecond	whole number	8 * MaxPacketSize (65536)	Bytes a second each player’s packets may cost the server; a packet costs at least 128.
InboundBurst	whole number, at least MaxPacketSize	the larger of InboundBytesPerSecond and MaxPacketSize (65536)	The most inbound budget a player may bank.
MaxUnreliableSize	whole number	900	Largest unreliable payload, checked at compile time and on send.
DefaultRate	whole number	none	Events per second per player for every inbound event and function without its own Rate.
RequireRates	boolean	false	Make an inbound event or function with no effective rate a compile error (E3020).
Predict	boolean	false	Add Predict to every event this side listens to (not polled ones): it delivers to local listeners without a remote.
InvocationTimeout	whole number	10	Seconds before an unanswered Invoke fails.
UseColon	boolean	none	Deprecated and ignored; warns W3017. Delete it.

Value syntax

Value	Written as	Example
boolean	true or false	option Predict = true
path string	a quoted path, relative to the schema’s folder unless absolute	option ServerOutput = "../src/Network/Server.luau"
Luau path string	a quoted Luau expression, inserted into require(...)	option PromiseLibrary = "ReplicatedStorage.Packages.Promise"
whole number	a positive integer	option MaxPacketSize = 16384
casing	a bare word	option Casing = Camel

A number that is zero, negative or fractional is refused (E2003), as is an unknown option name or casing. An option after the first declaration is E3016; one set twice for the same build is E3024.

What the options do not change

None of these options changes the bytes on the wire, so none of them is part of the schema signature. A server and a client built from the same declarations with different options still talk to each other. RemoteScope is the exception in practice: it changes the remotes’ names, so a client with a different scope never finds the server’s remotes at all.