diff --git a/src/csv-loader/rollup.ts b/src/csv-loader/rollup.ts
index b16c234..07a03e6 100644
--- a/src/csv-loader/rollup.ts
+++ b/src/csv-loader/rollup.ts
@@ -1,4 +1,3 @@
-import type { Plugin } from 'rollup';
 import type { CsvLoaderOptions } from './loader.js';
 import { csvToModule } from './loader.js';
 import * as path from 'path';
@@ -25,11 +24,35 @@ function matchesPattern(
   });
 }
 
+interface TransformResult {
+  code: string;
+  map: null;
+}
+
+interface EmitFileOptions {
+  type: 'asset';
+  fileName: string;
+  source: string;
+}
+
+interface PluginContext {
+  emitFile: (options: EmitFileOptions) => string;
+}
+
+interface RollupPlugin {
+  name: string;
+  transform: (
+    this: PluginContext,
+    code: string,
+    id: string
+  ) => TransformResult | null;
+}
+
 /**
  * Rollup plugin for loading CSV files with inline-schema validation.
  * Works with both Vite and Tsup (esbuild).
  */
-export function csvLoader(options: CsvRollupOptions = {}): Plugin {
+export function csvLoader(options: CsvRollupOptions = {}): RollupPlugin {
   const {
     include = /\.csv$/,
     exclude,