chore: remove define plugin in rspack-cli

packages/rspack-cli/src/rspack-cli.ts

@@ -185,22 +185,6 @@ export class RspackCLI {
  }
  }
 
- // Tells webpack to set process.env.NODE_ENV to a given string value.
- // optimization.nodeEnv uses DefinePlugin unless set to false.
- // optimization.nodeEnv defaults to mode if set, else falls back to 'production'.
- // See doc: https://webpack.js.org/configuration/optimization/#optimizationnodeenv
- // See source: https://github.com/webpack/webpack/blob/8241da7f1e75c5581ba535d127fa66aeb9eb2ac8/lib/WebpackOptionsApply.js#L563
-
- // When mode is set to 'none', optimization.nodeEnv defaults to false.
- if (item.mode !== "none") {
- (item.plugins ||= []).push(
- new rspackCore.DefinePlugin({
- // User defined `process.env.NODE_ENV` always has highest priority than default define
- "process.env.NODE_ENV": JSON.stringify(item.mode)
- })
- );
- }
-
  if (typeof item.stats === "undefined") {
  item.stats = { preset: "errors-warnings", timings: true };
  } else if (typeof item.stats === "boolean") {