Answers for "webpack module not found"

error: Cannot find module 'webpack'

npm link webpack

error Command "webpack" not found.

bundle exec rails webpacker:install

webpack error cannot find module

resolve: {
    modules: [resolve(process.cwd(), 'src'), 'node_modules'],
    extensions: ['*', '.js', '.jsx', '.json'],
    symlinks: false,
    cacheWithContext: false
  }