Webpack默认配置技术问询：查看、禁用及修改方式确认

Great question! Let's walk through each of your doubts clearly, based on how Webpack operates under the hood:

1. Can you view these default configuration objects? #

Absolutely! There are a couple of straightforward ways to do this:

• Using the Webpack CLI: Run the command webpack --show-config (for Webpack 5+; older versions might use webpack --display-config). This will print out the full merged configuration, including all default values Webpack uses for your current environment (development/production).
• Inspecting via code: You can directly import and log Webpack's default config logic. For example, in a Node.js script:

  const webpack = require('webpack');
  // Get default config for development mode
  const defaultDevConfig = webpack.configuration.getDefaultConfig('development');
  console.log(defaultDevConfig);
  // Get default config for production mode
  const defaultProdConfig = webpack.configuration.getDefaultConfig('production');
  console.log(defaultProdConfig);
  

  This lets you see exactly what defaults Webpack applies for each environment.

2. Can you completely disable the default configurations? #

Short answer: No, you can't fully disable them—but you can effectively replace them. Webpack relies on these base defaults to handle core tasks like setting entry points, output paths, and basic module rules. Without any defaults, Webpack wouldn't have a starting point to process your code.

That said, you can provide a fully custom configuration that overrides every single default setting. For example, if you define your own entry, output, module.rules, plugins, etc., the default values won't have any impact on your build. It's less "disabling" and more "replacing the entire default setup with your own".

3. Is overriding the only way to modify these default configurations? #

Not exactly—while overriding is the most common approach, you can also merge your custom settings with the defaults instead of replacing them entirely.

Webpack uses a merging logic (similar to webpack-merge) to combine your config with the defaults. For example:

• If you want to add an additional entry point without replacing the default ./src/index.js, structure your config like this:

  const webpack = require('webpack');
  const defaultConfig = webpack.configuration.getDefaultConfig('development');
  
  module.exports = {
    ...defaultConfig,
    entry: {
      ...defaultConfig.entry,
      another: './src/another-entry.js'
    }
  };
  

• For more complex merges (like adding a new plugin without replacing all default plugins), use the official webpack-merge library:

  const { merge } = require('webpack-merge');
  const webpack = require('webpack');
  const defaultConfig = webpack.configuration.getDefaultConfig('development');
  
  module.exports = merge(defaultConfig, {
    plugins: [new webpack.ProgressPlugin()]
  });
  

  This way, you're extending the default config rather than completely overriding it.

内容的提问来源于stack exchange，提问作者Unknown developer