customLogger can't be adjusted via plugin

[leonheess]

Describe the bug

One can easily change the vite config of an app by loading a plugin that uses the config hook. However, this does not work for the customLogger property for some reason.

Reproduction

https://stackblitz.com/edit/vitejs-vite-gechfp?file=vite.config.ts&view=editor

Steps to reproduce

Run the app and observe no changes to the log output. Modify customLogger directly (commented out) and it works.

import { createLogger, defineConfig, LogOptions } from 'vite';

const logger = createLogger();
const customLogger = {
  ...logger,
  info: (msg: string, options?: LogOptions) =>
    logger.info('Hi! I was inserted.\n' + msg, options),
};

const customServer = {
  port: 666,
};

export default defineConfig({
  plugins: [
    (() => ({
      name: 'logger-changer',
      config: () => ({
        server: customServer, // <-- works
        customLogger, // <-- doesn't work
      }),
    }))(),
  ],
});

/* this works for some reason
export default defineConfig({
  server: customServer, // <-- works
  customLogger, // <-- works
  }
});
*/

[bluwy]

This is fixed in #10787. It should be available in the latest Vite 4 alpha release now.