[Bug]: extensionAlias is undefined when use webpack provider

[beliefgp]

Version

System:
    OS: macOS 14.5
    CPU: (8) arm64 Apple M3
    Memory: 87.39 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Browsers:
    Chrome: 129.0.6668.70
    Safari: 17.5
  npmPackages:
    @rsbuild/core: ^1.0.1 => 1.0.6 
    @rsbuild/plugin-less: ^1.0.1 => 1.0.1 
    @rsbuild/plugin-vue: ^1.0.1 => 1.0.1 
    @rsbuild/plugin-webpack-swc: ^1.0.2 => 1.0.2 
    @rsbuild/webpack: ^1.0.5 => 1.0.5

Details

https://github.com/web-infra-dev/rsbuild/blob/main/packages/core/src/plugins/resolve.ts#L48

extensionAlias is undefined when use webpack provider,

use rspack, it is ok

import { defineConfig } from '@rsbuild/core';
import { pluginVue } from '@rsbuild/plugin-vue';
import { webpackProvider } from '@rsbuild/webpack';
import { pluginSwc } from '@rsbuild/plugin-webpack-swc';

export default defineConfig({
  provider: webpackProvider,
  source: {
    entry: {
      main: './src/index.ts'
    },
  },
  plugins: [
    pluginSwc(),
    pluginVue(), 
  ]
});

plugin-webpack has its own rsbuild dependency, should it be changed to peer？

https://github.com/web-infra-dev/rsbuild/blob/main/packages/compat/webpack/package.json#L31

Reproduce link

xxx

Reproduce Steps

npx rsbuild build

[github-actions]

Hello @beliefgp. Please provide a reproduction repository or online demo. For background, see Why reproductions are required. Thanks ❤️

[chenjiahan]

Can not reproduce this issue:

[beliefgp]

@chenjiahan 这个主要是发生在 @rsbuild/core 和 @rsbuid/webpack 两边版本不同步的情况下，比如这次的问题：
是 @rsbuild/core 1.0.6 增加了 extensionAlias，但是 @rsbuid/webpack 1.0.5 内部依赖的还是 @rsbuild/core@1.0.5 就造成了这次的问题。

按现在的使用方式：

import { webpackProvider } from '@rsbuild/webpack';

export default defineConfig({
  provider: webpackProvider,
});

@rsbuild/webpack 对 @rsbuild/core 的依赖应该放在 peer 里面，而不是 dep 里

[chenjiahan]

Actually @rsbuid/webpack is not a public package...Are you using Rsbuild + webpack to build your project?

[beliefgp]

是的，使用的 @rsbuild/core，但因为一些原因，还是需要使用 webpack，所以引入了 @rsbuid/webpack，但目前 @rsbuid/webpack 并没有提供 cli 指令，也不是作为独立包使用的，从现在的使用上来讲，它的定位类似于 rsbuild 的插件。

所以 @rsbuid/webpack 不应该把 @rsbuild/core 放在 dep 里，而应该是放在 peerDep 里。

[chenjiahan]

Ok, I will adjust the dependency. Please note that @rsbuild/webpack is not a public package and we do not guarantee that the API it provides is stable.