fix: ensure implicit config options load automatically

package.json

@@ -45,8 +45,8 @@
     "@nestjs/core": "^10.0.0"
   },
   "devDependencies": {
-    "@mikro-orm/core": "^6.2.7",
-    "@mikro-orm/sqlite": "^6.2.7",
+    "@mikro-orm/core": "^6.3.14-dev.67",
+    "@mikro-orm/sqlite": "^6.3.14-dev.67",
     "@nestjs/common": "^10.3.8",
     "@nestjs/core": "^10.3.8",
     "@nestjs/platform-express": "^10.3.8",

src/mikro-orm-core.module.ts

@@ -153,10 +153,14 @@ export class MikroOrmCoreModule implements OnApplicationShutdown {
     }
 
     try {
-      let config;
+      let config: Configuration | undefined;
 
       if (!options || Object.keys(options).length === 0) {
-        config = await ConfigurationLoader.getConfiguration(false);
+        const configPathFromArg = ConfigurationLoader.configPathsFromArg();
+        config = await ConfigurationLoader.getConfiguration(process.env.MIKRO_ORM_CONTEXT_NAME, configPathFromArg ?? ConfigurationLoader.getConfigPaths());
+        if (configPathFromArg) {
+          config.getLogger().warn('deprecated', 'Path for config file was inferred from the command line arguments. Instead, you should set the MIKRO_ORM_CLI_CONFIG environment variable to specify the path, or if you really must use the command line arguments, import the config manually based on them, and pass it to init.', { label: 'D0001' });
+        }
       }
 
       if (!config && 'useFactory' in options!) {

src/mikro-orm.providers.ts

@@ -29,9 +29,14 @@ export function createMikroOrmProvider(
       }
 
       if (!options || Object.keys(options).length === 0) {
-        const config = await ConfigurationLoader.getConfiguration();
+        ConfigurationLoader.commonJSCompat({});
+        const configPathFromArg = ConfigurationLoader.configPathsFromArg();
+        const config = await ConfigurationLoader.getConfiguration(process.env.MIKRO_ORM_CONTEXT_NAME, configPathFromArg ?? ConfigurationLoader.getConfigPaths());
         config.set('logger', logger.log.bind(logger));
         options = config as unknown as MikroOrmModuleOptions;
+        if (configPathFromArg) {
+          config.getLogger().warn('deprecated', 'Path for config file was inferred from the command line arguments. Instead, you should set the MIKRO_ORM_CLI_CONFIG environment variable to specify the path, or if you really must use the command line arguments, import the config manually based on them, and pass it to init.', { label: 'D0001' });
+        }
       }
 
       return MikroORM.init(options);

tests/mikro-orm.module.test.ts

@@ -1,4 +1,4 @@
-import { EntityRepository, Options, EntityManager, MikroORM } from '@mikro-orm/core';
+import { EntityRepository, Options, EntityManager, MikroORM, Utils } from '@mikro-orm/core';
 import { SqliteDriver } from '@mikro-orm/sqlite';
 import { Inject, Logger, Module, Scope } from '@nestjs/common';
 import { ContextIdFactory } from '@nestjs/core';
@@ -82,6 +82,25 @@ describe('MikroORM Module', () => {
   });
 
   describe('Single Database', () => {
+    it('forRoot without options', async () => {
+      const spy = jest.spyOn(Utils, 'dynamicImport').mockImplementation(id => import(id));
+      const tmp = process.env.MIKRO_ORM_CLI_CONFIG;
+      process.env.MIKRO_ORM_CLI_CONFIG = `${__dirname}/test.config.ts`;
+
+      const module = await Test.createTestingModule({
+        imports: [MikroOrmModule.forRoot()],
+      }).compile();
+
+      const orm = module.get<MikroORM>(MikroORM);
+      expect(orm).toBeDefined();
+      expect(orm.config.get('contextName')).toBe('default');
+      expect(module.get<EntityManager>(EntityManager)).toBeDefined();
+      await orm.close();
+
+      process.env.MIKRO_ORM_CLI_CONFIG = tmp;
+      spy.mockRestore();
+    });
+
     it('forRoot', async () => {
       const module = await Test.createTestingModule({
         imports: [MikroOrmModule.forRoot(testOptions)],

tests/test.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from '@mikro-orm/core';
+import { SqliteDriver } from '@mikro-orm/sqlite';
+
+export default defineConfig({
+  dbName: 'memory:',
+  driver: SqliteDriver,
+  baseDir: __dirname,
+  entities: ['entities'],
+  connect: false,
+});