API Transforms

JavaScript standard-library APIs are compiled inline — no runtime polyfill package is required. Array and Object helpers that have no direct Luau equivalent are emitted as auto-generated helper functions in the output preamble, included only when used.

TypeScript	Luau
console.log() / console.warn() / console.error()	print() / warn()
Math.floor() / Math.PI / Math.*	math.floor() / math.pi / math.*
JSON.stringify() / JSON.parse()	HttpService:JSONEncode() / JSONDecode()
parseInt() / parseFloat()	tonumber()
setTimeout(fn, ms) / clearTimeout(id)	task.delay(ms / 1000, fn) / task.cancel(id)
arr.push/pop/shift/includes/indexOf	Luau table equivalents
arr.map/filter/reduce/find/some/every	Auto-generated helper functions
arr.slice/splice/flat/flatMap/concat/reverse/fill	Auto-generated helper functions
arr.length / str.length	# operator
str.toLowerCase/toUpperCase/trim/split	string.* equivalents
str.includes/startsWith/endsWith/replace	string.find / string.sub / string.gsub
Object.keys/values/entries/assign	Auto-generated helpers
Number.isInteger/isNaN/isFinite	Inline Luau checks
Array.isArray(x) / Array.from(x)	Type check / table conversion
Map/Set .get/.set/.has/.add/.delete/.clear/.size	Table operations (resolved via the type checker)
/regex/flags	RegExp("regex", "flags") via luau-regexp
v.add/sub/mul/div/idiv(x)	v + x / v - x / v * x / v / x / v // x (value-type operators)

RegExp

JavaScript regex literals (/pattern/flags) and RegExp methods compile to calls into luau-regexp. See the regex example for the full mapping of .test, .exec, .match, and .replace.

Value-type math

Since TypeScript lacks operator overloading, Roblox value types expose arithmetic as methods that compile to native Luau operators:

const moved = position.add(offset);   // → position + offset
const scaled = size.mul(2);           // → size * 2