diff --git a/plugins/typescript/src/generators/generateFetchers.ts b/plugins/typescript/src/generators/generateFetchers.ts
index 7e5ce6f8..f829374e 100644
--- a/plugins/typescript/src/generators/generateFetchers.ts
+++ b/plugins/typescript/src/generators/generateFetchers.ts
@@ -65,7 +65,12 @@ export const generateFetchers = async (context: Context, config: Config) => {
   const filenamePrefix =
     c.snake(config.filenamePrefix ?? context.openAPIDocument.info.title) + "-";
 
-  const formatFilename = config.filenameCase ? c[config.filenameCase] : c.camel;
+  const formatFilename =
+    typeof config.formatFilename === "function"
+      ? config.formatFilename
+      : config.filenameCase
+        ? c[config.filenameCase]
+        : c.camel;
 
   const filename = formatFilename(filenamePrefix + "-components");
 
diff --git a/plugins/typescript/src/generators/generateReactQueryComponents.ts b/plugins/typescript/src/generators/generateReactQueryComponents.ts
index 99887fd3..df1ca2d2 100644
--- a/plugins/typescript/src/generators/generateReactQueryComponents.ts
+++ b/plugins/typescript/src/generators/generateReactQueryComponents.ts
@@ -70,7 +70,12 @@ export const generateReactQueryComponents = async (
   const filenamePrefix =
     c.snake(config.filenamePrefix ?? context.openAPIDocument.info.title) + "-";
 
-  const formatFilename = config.filenameCase ? c[config.filenameCase] : c.camel;
+  const formatFilename =
+    typeof config.formatFilename === "function"
+      ? config.formatFilename
+      : config.filenameCase
+        ? c[config.filenameCase]
+        : c.camel;
 
   const filename = formatFilename(filenamePrefix + "-components");
 
diff --git a/plugins/typescript/src/generators/generateReactQueryFunctions.ts b/plugins/typescript/src/generators/generateReactQueryFunctions.ts
index 65a43898..e5ca827b 100644
--- a/plugins/typescript/src/generators/generateReactQueryFunctions.ts
+++ b/plugins/typescript/src/generators/generateReactQueryFunctions.ts
@@ -72,7 +72,12 @@ export const generateReactQueryFunctions = async (
   const filenamePrefix =
     c.snake(config.filenamePrefix ?? context.openAPIDocument.info.title) + "-";
 
-  const formatFilename = config.filenameCase ? c[config.filenameCase] : c.camel;
+  const formatFilename =
+    typeof config.formatFilename === "function"
+      ? config.formatFilename
+      : config.filenameCase
+        ? c[config.filenameCase]
+        : c.camel;
 
   const filename = formatFilename(filenamePrefix + "-functions");
 
@@ -143,8 +148,6 @@ export const generateReactQueryFunctions = async (
           ),
         });
 
-        
-
         const operationFetcherFnName = `fetch${c.pascal(operationId)}`;
         const operationQueryFnName = `${c.pascal(operationId)}Query`;
         const component: "useQuery" | "useMutate" =
@@ -157,7 +160,6 @@ export const generateReactQueryFunctions = async (
         }
 
         if (component === "useQuery") {
-          
           nodes.push(...declarationNodes);
 
           keyManagerItems.push(
diff --git a/plugins/typescript/src/generators/generateSchemaTypes.ts b/plugins/typescript/src/generators/generateSchemaTypes.ts
index 14a32de9..ad0fbee3 100644
--- a/plugins/typescript/src/generators/generateSchemaTypes.ts
+++ b/plugins/typescript/src/generators/generateSchemaTypes.ts
@@ -72,7 +72,12 @@ export const generateSchemaTypes = async (
   const filenamePrefix =
     c.snake(config.filenamePrefix ?? context.openAPIDocument.info.title) + "-";
 
-  const formatFilename = config.filenameCase ? c[config.filenameCase] : c.camel;
+  const formatFilename =
+    typeof config.formatFilename === "function"
+      ? config.formatFilename
+      : config.filenameCase
+        ? c[config.filenameCase]
+        : c.camel;
   const files = {
     requestBodies: formatFilename(filenamePrefix + "-request-bodies"),
     schemas: formatFilename(filenamePrefix + "-schemas"),
diff --git a/plugins/typescript/src/generators/types.ts b/plugins/typescript/src/generators/types.ts
index 18708fca..b3d968ed 100644
--- a/plugins/typescript/src/generators/types.ts
+++ b/plugins/typescript/src/generators/types.ts
@@ -25,6 +25,11 @@ export type ConfigBase = {
    * @default camel
    */
   filenameCase?: keyof Pick<typeof c, "snake" | "camel" | "kebab" | "pascal">;
+  /**
+   * Allows customizing the filename.
+   * If provided, `filenameCase` will be ignored.
+   */
+  formatFilename?: (filename: string) => string;
   /**
    * Allows using explicit enums instead of string unions.
    *