docs: fix build by moving constants to a separate file and avoid bundler crash (backport)

Author: tmlmt

docs/.vitepress/config.mts

@@ -3,9 +3,7 @@ import { defineConfig } from "vitepress";
 // @ts-ignore: linting before typedoc is generated will throw an error here
 import typedocSidebar from "../api/typedoc-sidebar.json";
 import { fullVersion, majorVersion, majorNumber } from "./version";
-
-const isProd = process.env.NODE_ENV === "production";
-const siteUrl = "https://cooklang-parser.tmlmt.com";
+import { isProd, siteUrl } from "./constants";
 
 // https://vitepress.dev/reference/site-config
 export default defineConfig({

docs/.vitepress/constants.ts

@@ -0,0 +1,2 @@
+export const isProd = process.env.NODE_ENV === "production";
+export const siteUrl = "https://cooklang-parser.tmlmt.com";

docs/.vitepress/theme/Layout.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import DefaultTheme from "vitepress/theme";
 import { isPrerelease, majorVersion } from "../version";
+import { isProd, siteUrl } from "../constants";
 
 const { Layout } = DefaultTheme;
 </script>