From 84dbeaaddae0c5a309c2eaed60ff2cf6b0d8afe7 Mon Sep 17 00:00:00 2001
From: Hayleigh Thompson <me@hayleigh.dev>
Date: Sat, 19 Aug 2023 22:59:18 +0100
Subject: :sparkles: Return an error when components and applications are used
 outside of a browser-like environment.

---
 lib/src/lustre.ffi.mjs | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'lib/src/lustre.ffi.mjs')

diff --git a/lib/src/lustre.ffi.mjs b/lib/src/lustre.ffi.mjs
index 998c598..5cf5058 100644
--- a/lib/src/lustre.ffi.mjs
+++ b/lib/src/lustre.ffi.mjs
@@ -1,4 +1,8 @@
-import { ElementNotFound, ComponentAlreadyRegistered } from "./lustre.mjs";
+import {
+  ElementNotFound,
+  ComponentAlreadyRegistered,
+  NotABrowser,
+} from "./lustre.mjs";
 import { from } from "./lustre/effect.mjs";
 import { map } from "./lustre/element.mjs";
 import { morph } from "./runtime.ffi.mjs";
@@ -26,6 +30,7 @@ export class App {
   }
 
   start(selector, flags) {
+    if (!is_browser()) return new Error(new NotABrowser());
     if (this.#root) return this;
 
     try {
@@ -137,6 +142,7 @@ export const setup_component = (
   render,
   on_attribute_change
 ) => {
+  if (!is_browser()) return new Error(new NotABrowser());
   if (customElements.get(name)) {
     return new Error(new ComponentAlreadyRegistered());
   }
@@ -204,3 +210,7 @@ export const setup_component = (
   );
   return new Ok(null);
 };
+
+// UTLS ------------------------------------------------------------------------
+
+export const is_browser = () => window && window.document;
-- 
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