chore: update comment

Author: sapphi-red

packages/vite/src/node/config.ts

@@ -567,7 +567,14 @@ export interface LegacyOptions {
    */
   skipWebSocketTokenCheck?: boolean
   /**
-   * TODO: write description
+   * Opt-in to the pre-Vite 8 CJS interop behavior, which was inconsistent.
+   *
+   * In pre-Vite 8 versions, Vite had inconsistent CJS interop behavior. This was due to
+   * the different behavior of esbuild and the Rollup commonjs plugin.
+   * Vite 8+ uses Rolldown for both the dependency optimization in dev and the production build,
+   * which aligns the behavior to esbuild.
+   *
+   * See the Vite 8 migration guide for more details.
    */
   inconsistentCjsInterop?: boolean
 }

packages/vite/src/node/plugins/resolve.ts

@@ -169,7 +169,7 @@ interface ResolvePluginOptions {
   idOnly?: boolean
 
   /**
-   * TODO: write description
+   * Enable when `legacy.inconsistentCjsInterop` is true. See that option for more details.
    */
   legacyInconsistentCjsInterop?: boolean
 }