Changes all documents to have an explicit type

src/components/documents/DocumentEditForm.tsx

@@ -1,13 +1,4 @@
-import {
-  isLocation,
-  isMonster,
-  isNpc,
-  isScene,
-  isSecret,
-  isSession,
-  isTreasure,
-  type AnyDocument,
-} from "@/lib/types";
+import { type AnyDocument } from "@/lib/types";
 import { LocationEditForm } from "./location/LocationEditForm";
 import { MonsterEditForm } from "./monsters/MonsterEditForm";
 import { NpcEditForm } from "./npc/NpcEditForm";
@@ -16,41 +7,24 @@ import { SecretEditForm } from "./secret/SecretEditForm";
 import { SessionEditForm } from "./session/SessionEditForm";
 import { TreasureEditForm } from "./treasure/TreasureEditForm";
 
-function assertUnreachable(_x: never): never {
-  throw new Error("DocumentForm switch is not exhaustive");
-}
-
 /**
  * Renders a form for any document type depending on the relationship.
  */
 export const DocumentEditForm = ({ document }: { document: AnyDocument }) => {
-  if (isLocation(document)) {
-    return <LocationEditForm location={document} />;
+  switch (document.type) {
+    case "location":
+      return <LocationEditForm location={document} />;
+    case "monster":
+      return <MonsterEditForm monster={document} />;
+    case "npc":
+      return <NpcEditForm npc={document} />;
+    case "scene":
+      return <SceneEditForm scene={document} />;
+    case "secret":
+      return <SecretEditForm secret={document} />;
+    case "session":
+      return <SessionEditForm session={document} />;
+    case "treasure":
+      return <TreasureEditForm treasure={document} />;
   }
-
-  if (isMonster(document)) {
-    return <MonsterEditForm monster={document} />;
-  }
-
-  if (isNpc(document)) {
-    return <NpcEditForm npc={document} />;
-  }
-
-  if (isScene(document)) {
-    return <SceneEditForm scene={document} />;
-  }
-
-  if (isSecret(document)) {
-    return <SecretEditForm secret={document} />;
-  }
-
-  if (isSession(document)) {
-    return <SessionEditForm session={document} />;
-  }
-
-  if (isTreasure(document)) {
-    return <TreasureEditForm treasure={document} />;
-  }
-
-  return assertUnreachable(document);
 };