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packages/api/src/lib/openapi-schema.ts

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+import { type MergeInput, isErrorResult, merge } from "openapi-merge";
+
+export function mergeOpenApiSchemas({
+	appSchema,
+	authSchema,
+}: {
+	appSchema: MergeInput[number]["oas"];
+	authSchema: MergeInput[number]["oas"];
+}) {
+	const mergedSchema = merge([
+		{
+			oas: appSchema,
+		},
+		{
+			oas: authSchema,
+			pathModification: {
+				prepend: "/api/auth",
+			},
+		},
+	]);
+
+	if (isErrorResult(mergedSchema)) {
+		return {};
+	}
+
+	const output = mergedSchema.output;
+
+	Object.entries(output.paths).forEach(([path, pathItem]) => {
+		if (path.startsWith("/api/auth")) {
+			const methods = ["post", "get", "put", "delete", "patch"];
+			methods.forEach((method) => {
+				const methodItem = pathItem[method as keyof typeof pathItem];
+				if (
+					methodItem &&
+					typeof methodItem === "object" &&
+					!Array.isArray(methodItem)
+				) {
+					methodItem.tags = ["Auth"];
+				}
+			});
+		}
+	});
+
+	return output;
+}