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diff --git a/src/lustre.gleam b/src/lustre.gleam
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+//// To read the full documentation for this module, please visit
+//// [https://pkg.hayleigh.dev/lustre/api/lustre](https://pkg.hayleigh.dev/lustre/api/lustre)
+
+// IMPORTS ---------------------------------------------------------------------
+
+import gleam/dynamic.{Decoder}
+import gleam/map.{Map}
+import lustre/effect.{Effect}
+import lustre/element.{Element}
+
+// TYPES -----------------------------------------------------------------------
+
+///
+pub type App(flags, model, msg)
+
+pub type Error {
+  AppAlreadyStarted
+  AppNotYetStarted
+  BadComponentName
+  ComponentAlreadyRegistered
+  ElementNotFound
+  NotABrowser
+}
+
+// CONSTRUCTORS ----------------------------------------------------------------
+
+@target(javascript)
+///
+pub fn element(element: Element(msg)) -> App(Nil, Nil, msg) {
+  let init = fn(_) { #(Nil, effect.none()) }
+  let update = fn(_, _) { #(Nil, effect.none()) }
+  let view = fn(_) { element }
+
+  application(init, update, view)
+}
+
+@target(javascript)
+///
+pub fn simple(
+  init: fn(flags) -> model,
+  update: fn(model, msg) -> model,
+  view: fn(model) -> Element(msg),
+) -> App(flags, model, msg) {
+  let init = fn(flags) { #(init(flags), effect.none()) }
+  let update = fn(model, msg) { #(update(model, msg), effect.none()) }
+
+  application(init, update, view)
+}
+
+@target(javascript)
+///
+@external(javascript, "./lustre.ffi.mjs", "setup")
+pub fn application(
+  init: fn(flags) -> #(model, Effect(msg)),
+  update: fn(model, msg) -> #(model, Effect(msg)),
+  view: fn(model) -> Element(msg),
+) -> App(flags, model, msg)
+
+@target(javascript)
+@external(javascript, "./lustre.ffi.mjs", "setup_component")
+pub fn component(
+  name: String,
+  init: fn() -> #(model, Effect(msg)),
+  update: fn(model, msg) -> #(model, Effect(msg)),
+  view: fn(model) -> Element(msg),
+  on_attribute_change: Map(String, Decoder(msg)),
+) -> Result(Nil, Error)
+
+// EFFECTS ---------------------------------------------------------------------
+
+@target(javascript)
+///
+@external(javascript, "./lustre.ffi.mjs", "start")
+pub fn start(
+  app: App(flags, model, msg),
+  selector: String,
+  flags: flags,
+) -> Result(fn(msg) -> Nil, Error)
+
+@target(javascript)
+///
+@external(javascript, "./lustre.ffi.mjs", "destroy")
+pub fn destroy(app: App(flags, model, msg)) -> Result(Nil, Error)
+
+// UTILS -----------------------------------------------------------------------
+
+///
+@external(javascript, "./lustre.ffi.mjs", "is_browser")
+pub fn is_browser() -> Bool {
+  False
+}
+
+///
+@external(javascript, "./lustre.ffi.mjs", "is_registered")
+pub fn is_registered(_name: String) -> Bool {
+  False
+}