chore: revert add back types

This reverts commit e09ed15.

packages/vite/src/node/config.ts

@@ -322,13 +322,8 @@ export interface ExperimentalOptions {
 
 export interface LegacyOptions {
  /**
- * Revert vite build --ssr to the v2.9 strategy. Use CJS SSR build and v2.9 externalization heuristics
- * Since Vite 5, this option is ignored.
- * @experimental
- * @deprecated SSR build output is now always ESM
- * @default false
+ * No longer needed for now, but kept for backwards compatibility.
  */
- buildSsrCjsExternalHeuristics?: boolean
 }
 
 export interface ResolveWorkerOptions extends PluginHookUtils {
@@ -847,7 +842,9 @@ assetFileNames isn't equal for every build.rollupOptions.output. A single patter
 
  // Warn about removal of experimental features
  if (
+ // @ts-expect-error Option removed
  config.legacy?.buildSsrCjsExternalHeuristics ||
+ // @ts-expect-error Option removed
  config.ssr?.format === 'cjs'
  ) {
  resolved.logger.warn(

packages/vite/src/node/index.ts

@@ -51,7 +51,6 @@ export type {
  ResolvedSSROptions,
  SsrDepOptimizationOptions,
  SSROptions,
- SSRFormat,
  SSRTarget,
 } from './ssr'
 export type { Plugin, HookHandler } from './plugin'

packages/vite/src/node/ssr/index.ts

@@ -2,11 +2,6 @@ import type { DepOptimizationConfig } from '../optimizer'
 
 export type SSRTarget = 'node' | 'webworker'
 
-/**
- * @deprecated SSR build output is now always ESM
- */
-export type SSRFormat = 'esm' | 'cjs'
-
 export type SsrDepOptimizationOptions = DepOptimizationConfig
 
 export interface SSROptions {
@@ -18,13 +13,6 @@ export interface SSROptions {
  * @default 'node'
  */
  target?: SSRTarget
- /**
- * Define the format for the ssr build. Since Vite v5 this option is ignored.
- * @experimental
- * @deprecated SSR build output is now always ESM
- * @default 'esm'
- */
- format?: SSRFormat
  /**
  * Control over which dependencies are optimized during SSR and esbuild options
  * During build: