[Bug]: Panic Cannot get final name for export when using webpack.externals

[ikscoder]

System Info

System:
OS: Windows 10 10.0.19043
CPU: (12) x64 Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
Memory: 35.89 GB / 63.93 GB
Binaries:
Node: 22.14.0 - C:\Program Files\nodejs\node.EXE
Yarn: 1.22.17 - ~\AppData\Roaming\npm\yarn.CMD
npm: 10.8.3 - C:\Program Files\nodejs\npm.CMD
Browsers:
Chrome: 136.0.7103.93

@rspack/cli: 1.3.10
@rspack/core: 1.3.10

Details

When i define externals (e.g. pinia) build failed with:

Message:  Cannot get final name for export 'defineStore' 
Location: crates\rspack_core\src\concatenated_module.rs:2206

In webpack this configuration worked. For now I commented out some of the dependencies(not all cause panic), because it is not critical in my case.

Example rspack.config.ts if it is useful

import { RsdoctorRspackPlugin } from '@rsdoctor/rspack-plugin';
import {
	CopyRspackPlugin as CopyPlugin,
	DefinePlugin,
	CssExtractRspackPlugin as MiniCssExtractPlugin,
} from '@rspack/core';
import CaseSensitivePathsPlugin from 'case-sensitive-paths-webpack-plugin';
import ESLintPlugin from 'eslint-rspack-plugin';
import path from 'path';
import StylelintPlugin from 'stylelint-webpack-plugin';
import { TsCheckerRspackPlugin } from 'ts-checker-rspack-plugin';
import { VueLoaderPlugin } from 'vue-loader';
import { BundleAnalyzerPlugin } from 'webpack-bundle-analyzer';
import WebpackBar from 'webpackbar/rspack';
import { defaultPackOptions, rules } from '../../configs/rspack.config.base';

module.exports = (
	env: Record<string, boolean>,
	{ mode }: { mode: 'development' | 'production' } = { mode: 'production' },
): import('@rspack/core').Configuration => (
	{
		...defaultPackOptions(),
		mode,
		entry: { components: './components/index.ts', directives: './directives/index.ts' },
		output: {
			path: path.resolve(__dirname, 'dist'),
			publicPath: 'auto',
			filename: `ui/[name]/index.js`,
		},
		externals: [
			//...internal packages
			'vue',
			'vue-router', // <---  this failed
			'luxon',
			'lodash',
			'pinia', // <--- this failed
			'dexie',
		].reduce(
			(acc, cur) =>
				Object.assign(acc, {
					[cur]: { commonjs: cur, commonjs2: cur, amd: cur },
				}),
			{},
		),
		node: {
			__filename: true,
		},
		resolve: {
			alias: {
				vue: 'vue/dist/vue.runtime.esm-bundler.js',
			},
			extensions: ['.json', '.ts', '.js'],
		},
		module: {
			rules: rules(mode),
		},
		plugins: [
			env.BUNDLE_ANALYTICS && new RsdoctorRspackPlugin({}),
			new WebpackBar(),
			new VueLoaderPlugin(),
			new TsCheckerRspackPlugin(),
			new ESLintPlugin({
				extensions: ['ts', 'vue', 'js'],
				configType: 'flat',
				overrideConfigFile: path.resolve(__dirname, '../../configs/.eslintrc.base.mjs'),
			}),
			new StylelintPlugin({
				files: ['**/*.{vue,scss}'],
				configFile: path.resolve(__dirname, '../../configs/.stylelintrc.base.json'),
			}),
			new DefinePlugin({
				__VUE_OPTIONS_API__: true,
				__VUE_PROD_DEVTOOLS__: false,
				__VUE_PROD_HYDRATION_MISMATCH_DETAILS__: false,
			}),
			new MiniCssExtractPlugin({ filename: `ui/[name]/index.css` }),
			new CopyPlugin({ patterns: [{ from: 'package.json', to: './ui/package.json' }] }),

			env.BUNDLE_ANALYTICS &&
				new BundleAnalyzerPlugin({
					analyzerMode: 'static',
					reportFilename: '../../analytics/#host-bundle-report.html',
				}),
			mode !== 'production' && new CaseSensitivePathsPlugin(),
		].filter(Boolean),
	}
);

Reproduce link

No response

Reproduce Steps

1. npm create rspack@latest
2. npm i pinia
3. add to rspack.config.ts

	externals: [
		'vue',
		'pinia',
	].reduce(
		(acc, cur) =>
			Object.assign(acc, {
				[cur]: { commonjs: cur, commonjs2: cur, amd: cur },
			}),
		{},
	),

4. add to main.ts

import { defineStore } from 'pinia';
export const useAppStore = defineStore('app', () => { return {} })

5. build

Panic occurred at runtime. Please file an issue on GitHub with the backtrace below: https://github.com/web-infra-dev/rspack/issues
Message:  Cannot get final name for export 'defineComponent' 
Location: crates\rspack_core\src\concatenated_module.rs:2206 

[jkovar-acmark]

I have a similar issue with random error when building:

Panic occurred at runtime. Please file an issue on GitHub with the backtrace below: https://github.com/web-infra-dev/rspack/issues
Message:  Cannot get final name for export 'easeCubicInOut'
Location: crates/rspack_core/src/concatenated_module.rs:2206

most likely from plotly.js or d3-ease

@rsbuild/core: 1.3.20
macos 15.4

[github-actions]

Hello @ikscoder, sorry we can't investigate the problem further without reproduction demo, please provide a repro demo by forking rspack-repro, or provide a minimal GitHub repository by yourself. Issues labeled by need reproduction will be closed if no activities in 14 days.

[LingyuCoder]

Could you provide a repro? Problems of module concatenation are usually complex. It's hard to troubleshoot without a repro.