Add config option for connection string

Author: nirinchev

src/config.ts

@@ -8,10 +8,11 @@ const { localDataPath, configPath } = getLocalDataPath();
 
 // If we decide to support non-string config options, we'll need to extend the mechanism for parsing
 // env variables.
-interface UserConfig extends Record<string, string> {
+interface UserConfig extends Record<string, string | undefined> {
     apiBaseUrl: string;
     clientId: string;
     stateFile: string;
+    connectionString?: string;
 }
 
 const defaults: UserConfig = {

src/tools/mongodb/connect.ts

@@ -5,6 +5,7 @@ import { DbOperationType, MongoDBToolBase } from "./mongodbTool.js";
 import { ToolArgs } from "../tool.js";
 import { ErrorCodes, MongoDBError } from "../../errors.js";
 import { saveState } from "../../state.js";
+import config from "../../config.js";
 
 export class ConnectTool extends MongoDBToolBase {
     protected name = "connect";
@@ -21,7 +22,7 @@ export class ConnectTool extends MongoDBToolBase {
     protected async execute({
         connectionStringOrClusterName,
     }: ToolArgs<typeof this.argsShape>): Promise<CallToolResult> {
-        connectionStringOrClusterName ??= this.state.connectionString;
+        connectionStringOrClusterName ??= config.connectionString || this.state.connectionString;
         if (!connectionStringOrClusterName) {
             return {
                 content: [