Webpack 5 cache - typings not cached

Bug report

What is the current behavior? d.ts files are not emitted after removing the output folder and running webpack again. I use ts-loader and have set declaration: true and outDir: ‘dist’ in tsconfig.json.

If the current behavior is a bug, please provide the steps to reproduce.

Run webpack build for the first time - bundle.js and typings are emitted. Remove ‘dist’ folder and run webpack again.

webpack.config.js:

{
  mode: isDevelopment ? 'development' : 'production',
  entry: {
    main: ['./src/index.tsx'],
  },
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist'),
    publicPath: '/',
  },
  cache: {
    type: 'filesystem',
    buildDependencies: {
      sources: [path.resolve(process.cwd(), 'src') + '/'],
      tsConfig: [path.resolve(process.cwd(), 'tsconfig.json')],
      config: [__filename]
    },
  },
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        include: path.join(__dirname, 'src'),
        use: {
          loader: 'ts-loader'
        }
      },
      {
        test: /\.jsx?$/,
        include: path.join(__dirname, 'src'),
        use: 'babel-loader',
      },
    ],
  },
  resolve: {
    extensions: ['.ts', '.tsx', '.js', '.jsx'],
  },
};

What is the expected behavior? I expect idempotent behavior - set of files emitted by webpack build is the same regardless if the cache is utilized or not.

Other relevant information: webpack version: 5.37.1 Node.js version: 14.15.4 Operating System: Ubuntu 20.04 Additional tools: ts-loader: 9.2.2, typescript: 4.0.3

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This issue was moved from webpack/webpack#13465 by @alexander-akait. Original issue was by @MBelniak.

[johnnyreilly]

Reopened - if anyone would like to work on it that’s great. I’m not planning to myself, so we’ll need someone to step up if they want this to progress

[johnnyreilly]

If you’d like to look at this I’d be happy to look at the PR!