Improve loading environment variables based on https://github.com/san…

…ity-io/sanity/releases/tag/v3.5.0. and add support for `sanity schema extract`.

sanity.config.ts

@@ -1,19 +1,18 @@
+const env = process.env ?? import.meta.env;
+
 // Different environments use different variables
 const projectId =
-  import.meta.env.PUBLIC_SANITY_STUDIO_PROJECT_ID! ||
-  import.meta.env.PUBLIC_SANITY_PROJECT_ID!;
-const dataset =
-  import.meta.env.PUBLIC_SANITY_STUDIO_DATASET! ||
-  import.meta.env.PUBLIC_SANITY_DATASET!;
+  env.PUBLIC_SANITY_STUDIO_PROJECT_ID! || env.PUBLIC_SANITY_PROJECT_ID!;
+const dataset = env.PUBLIC_SANITY_STUDIO_DATASET! || env.PUBLIC_SANITY_DATASET!;
 
 const previewUrl =
-  import.meta.env.PUBLIC_SANITY_STUDIO_PREVIEW_URL || "http://localhost:4321";
+  env.PUBLIC_SANITY_STUDIO_PREVIEW_URL! || "http://localhost:4321";
 
 // Feel free to remove this check if you don't need it
 if (!projectId || !dataset || !previewUrl) {
   throw new Error(
     `Missing environment variable(s). Check if named correctly in .env file.\n\nShould be:\nPUBLIC_SANITY_STUDIO_PROJECT_ID=${projectId}\nPUBLIC_SANITY_STUDIO_DATASET=${dataset}\nPUBLIC_SANITY_STUDIO_PREVIEW_URL=${previewUrl}\n\nAvailable environment variables:\n${JSON.stringify(
-      import.meta.env,
+      env,
       null,
       2
     )}`
@@ -24,7 +23,9 @@ import { defineConfig } from "sanity";
 import { structureTool } from "sanity/structure";
 import { presentationTool } from "sanity/presentation";
 import { visionTool } from "@sanity/vision";
-import { schemaTypes } from "./schema";
+
+// We have to import the full path since `sanity schema extract` produces `schema.json` and then that file will be loaded, breaking the application.
+import { schemaTypes } from "./schema/index.ts";
 
 export default defineConfig({
   name: "project-name",