🔧 fix: handle group with empty prefix

Author: SaltyAom

CHANGELOG.md

@@ -9,6 +9,7 @@ Bug fix:
 - add set immediate fallback
 - [#1596](https://github.com/elysiajs/elysia/issues/1596) handle context pass to function with sub context
 - [#1597](https://github.com/elysiajs/elysia/issues/1597) safeParse, parse to static type
+- handle group with empty prefix
 
 # 1.4.18 - 4 Dec 2025
 Security:

example/a.ts

@@ -1,13 +1,9 @@
-import { t, getSchemaValidator } from '../src'
-import { sucrose } from '../src/sucrose'
+import { Elysia } from '../src'
 
-const v = sucrose({
-	handler: (context) => {
-		console.log('path >>> ', context.path)
-		console.log(context)
+const app = new Elysia()
+	.group('', (app) => {
+		return app.get('/ok', () => 'Hello World')
+	})
+	.listen(3000)
 
-		return { id: 'test' }
-	}
-})
-
-console.log(v)
+type Routes = keyof typeof app['~Routes']

src/index.ts

@@ -48,7 +48,7 @@ import {
 	getCookieValidator,
 	ElysiaTypeCheck,
 	hasType,
-	resolveSchema,
+	resolveSchema
 } from './schema'
 import {
 	composeHandler,
@@ -164,7 +164,12 @@ import type {
 	InlineHandlerNonMacro,
 	Router
 } from './types'
-import { coercePrimitiveRoot, coerceFormData, queryCoercions, stringToStructureCoercions } from './replace-schema'
+import {
+	coercePrimitiveRoot,
+	coerceFormData,
+	queryCoercions,
+	stringToStructureCoercions
+} from './replace-schema'
 
 export type AnyElysia = Elysia<any, any, any, any, any, any, any>
 
@@ -589,9 +594,16 @@ export default class Elysia<
 							models,
 							normalize,
 							additionalCoerce: (() => {
-								const resolved = resolveSchema(cloned.body, models, modules)
+								const resolved = resolveSchema(
+									cloned.body,
+									models,
+									modules
+								)
 								// Only check for Files if resolved schema is a TypeBox schema (has Kind symbol)
-								return (resolved && Kind in resolved && (hasType('File', resolved) || hasType('Files', resolved)))
+								return resolved &&
+									Kind in resolved &&
+									(hasType('File', resolved) ||
+										hasType('Files', resolved))
 									? coerceFormData()
 									: coercePrimitiveRoot()
 							})(),
@@ -657,9 +669,16 @@ export default class Elysia<
 									models,
 									normalize,
 									additionalCoerce: (() => {
-										const resolved = resolveSchema(cloned.body, models, modules)
+										const resolved = resolveSchema(
+											cloned.body,
+											models,
+											modules
+										)
 										// Only check for Files if resolved schema is a TypeBox schema (has Kind symbol)
-										return (resolved && Kind in resolved && (hasType('File', resolved) || hasType('Files', resolved)))
+										return resolved &&
+											Kind in resolved &&
+											(hasType('File', resolved) ||
+												hasType('Files', resolved))
 											? coerceFormData()
 											: coercePrimitiveRoot()
 									})(),
@@ -820,7 +839,6 @@ export default class Elysia<
 					route: path
 				})
 
-
 				const encoded = encodePath(loosePath)
 				if (loosePath !== encoded)
 					this.router.dynamic.add(method, loosePath, {
@@ -3823,7 +3841,7 @@ export default class Elysia<
 		prefix: Prefix,
 		run: (
 			group: Elysia<
-				JoinPath<BasePath, Prefix>,
+				Prefix extends '' ? BasePath : JoinPath<BasePath, Prefix>,
 				Singleton,
 				Definitions,
 				{
@@ -8154,13 +8172,8 @@ export {
 	type TraceStream
 } from './trace'
 
-export {
-	getSchemaValidator,
-	getResponseSchemaValidator,
-} from './schema'
-export {
-    replaceSchemaTypeFromManyOptions as replaceSchemaType
-} from './replace-schema'
+export { getSchemaValidator, getResponseSchemaValidator } from './schema'
+export { replaceSchemaTypeFromManyOptions as replaceSchemaType } from './replace-schema'
 
 export {
 	mergeHook,

test/types/index.ts

@@ -2922,3 +2922,16 @@ type a = keyof {}
 		? true
 		: false = true
 }
+
+// group empty prefix
+{
+	const app = new Elysia()
+		.group('', (app) => {
+			return app.get('/ok', () => 'Hello World')
+		})
+		.listen(3000)
+
+	type Routes = keyof (typeof app)['~Routes']
+
+	expectTypeOf<Routes>().toEqualTypeOf<'ok'>()
+}