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Filename with .js extension fails in webpack@5

See original GitHub issue

Versions:

webpack@5.74.0
webpack-stats-plugin@1.1.0

Problem:

To meet the project requirement, I’m supposed to generate stats.js file instead of the default stats.json file. Unfortunately the below setup ended up with an error.

new StatsWriterPlugin({
  filename: 'stats.js',
  fields: ['entrypoints'],
  transform(data) {
    const assets = data.entrypoints.main.assets;
    const stats = assets.map((asset, index) => {
      const order = index + 1;
      return {
        id: `asset-${order}`,
        name: asset.name,
        order
      };
    });
    statsStr = JSON.stringify(stats);
    return `define('stats',function(){return ${statsStr}});`;
  }
})

Error:

[webpack-cli] HookWebpackError: inputSource.sourceAndMap is not a function
    at makeWebpackError (/Users/xuser/workspace/my-project/node_modules/webpack/lib/HookWebpackError.js:48:9)
    at /Users/xuser/workspace/my-project/node_modules/webpack/lib/Compilation.js:3060:12
    at eval (eval at create (/Users/xuser/workspace/my-project/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:20:1)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
-- inner error --
TypeError: inputSource.sourceAndMap is not a function
    at /Users/xuser/workspace/my-project/node_modules/terser-webpack-plugin/dist/index.js:454:27
    at next (/Users/xuser/workspace/my-project/node_modules/terser-webpack-plugin/dist/utils.js:81:7)
    at Array.forEach (<anonymous>)
    at /Users/xuser/workspace/my-project/node_modules/terser-webpack-plugin/dist/utils.js:84:26
    at new Promise (<anonymous>)
    at throttleAll (/Users/xuser/workspace/my-project/node_modules/terser-webpack-plugin/dist/utils.js:53:10)
    at TerserPlugin.optimize (/Users/xuser/workspace/my-project/node_modules/terser-webpack-plugin/dist/index.js:662:11)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
caused by plugins in Compilation.hooks.processAssets
TypeError: inputSource.sourceAndMap is not a function
    at /Users/xuser/workspace/my-project/node_modules/terser-webpack-plugin/dist/index.js:454:27
    at next (/Users/xuser/workspace/my-project/node_modules/terser-webpack-plugin/dist/utils.js:81:7)
    at Array.forEach (<anonymous>)
    at /Users/xuser/workspace/my-project/node_modules/terser-webpack-plugin/dist/utils.js:84:26
    at new Promise (<anonymous>)
    at throttleAll (/Users/xuser/workspace/my-project/node_modules/terser-webpack-plugin/dist/utils.js:53:10)
    at TerserPlugin.optimize (/Users/xuser/workspace/my-project/node_modules/terser-webpack-plugin/dist/index.js:662:11)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)

Tips:

I found curCompiler.webpack at line 157 goes undefined, so I believe source object needs additional property (sourceAndMap).