fix(rsc/cjs): add __filename and __dirname

Author: hi-ogawa

packages/plugin-rsc/src/plugins/cjs.ts

@@ -6,6 +6,7 @@ import * as esModuleLexer from 'es-module-lexer'
 import { transformCjsToEsm } from '../transforms/cjs'
 import { createDebug } from '@hiogawa/utils'
 import { parseIdQuery } from './shared'
+import { fileURLToPath, pathToFileURL } from 'node:url'
 
 const debug = createDebug('vite-rsc:cjs')
 
@@ -62,6 +63,12 @@ export function cjsModuleRunnerPlugin(): Plugin[] {
 export default module.exports;
 export const __cjs_module_runner_transform = true;
 `)
+          // https://github.com/vitest-dev/vitest/blob/965cefc19722a6c899cd1d3decb3cc33e72af696/packages/vite-node/src/client.ts#L548-L554
+          const __filename = fileURLToPath(pathToFileURL(id).href)
+          const __dirname = path.dirname(__filename)
+          output.prepend(
+            `let __filename = ${JSON.stringify(__filename)}; let __dirname = ${JSON.stringify(__dirname)};\n`,
+          )
           return {
             code: output.toString(),
             map: output.generateMap({ hires: 'boundary' }),