From d5eb13d5a71e1282aa1d4973e04e63ae3abae277 Mon Sep 17 00:00:00 2001
From: Marvin Luchs <marvin.luchs@holisticon.de>
Date: Tue, 4 Nov 2025 09:54:50 +0100
Subject: [PATCH] Add support for named in-memory databases using the
 ?mode=memory connection query param

---
 packages/libsql-core/src/config.ts | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/packages/libsql-core/src/config.ts b/packages/libsql-core/src/config.ts
index 72cc4beb..e1d89ec7 100644
--- a/packages/libsql-core/src/config.ts
+++ b/packages/libsql-core/src/config.ts
@@ -33,7 +33,9 @@ const inMemoryMode = ":memory:";
 export function isInMemoryConfig(config: ExpandedConfig): boolean {
     return (
         config.scheme === "file" &&
-        (config.path === ":memory:" || config.path.startsWith(":memory:?"))
+        (config.path === ":memory:" ||
+            config.path.startsWith(":memory:?") ||
+            config.path.split("?")[1]?.includes("mode=memory"))
     );
 }
 
@@ -66,7 +68,10 @@ export function expandConfig(
     const originalUriScheme = uri.scheme.toLowerCase();
     const isInMemoryMode =
         originalUriScheme === "file" &&
-        uri.path === inMemoryMode &&
+        (uri.path === inMemoryMode ||
+            uri.query?.pairs.find(
+                ({ key, value }) => key === "mode" && value === "memory",
+            )) &&
         uri.authority === undefined;
 
     let queryParamsDef: queryParamsDef;
@@ -77,6 +82,11 @@ export function expandConfig(
                 update: (key, value) =>
                     connectionQueryParams.push(`${key}=${value}`),
             },
+            mode: {
+                values: ["memory"],
+                update: (key, value) =>
+                    connectionQueryParams.push(`${key}=${value}`),
+            },
         };
     } else {
         queryParamsDef = {
@@ -150,8 +160,8 @@ export function expandConfig(
     ) {
         throw new LibsqlError(
             'The client supports only "libsql:", "wss:", "ws:", "https:", "http:" and "file:" URLs, ' +
-                `got ${JSON.stringify(uri.scheme + ":")}. ` +
-                `For more information, please read ${supportedUrlLink}`,
+            `got ${JSON.stringify(uri.scheme + ":")}. ` +
+            `For more information, please read ${supportedUrlLink}`,
             "URL_SCHEME_NOT_SUPPORTED",
         );
     }