The issue of entryModule resolution is a common challenge encountered when using Angular 2 with Web

I am currently facing an issue while setting up an AOT build using Angular 2 and Webpack, although the JIT build is working perfectly. Every time I try to compile it, I encounter the following error:

ERROR in Could not resolve "src/app/app.module" from "src/app/app.module"
. Despite my attempts to troubleshoot by removing webpack plugins other than AotPlugin, experimenting with different combinations of relative and absolute paths for AotPlugin options, I have had no success so far. My current setup includes webpack 2.2.1, typescript 2.0.10, @ngtools/webpack 1.2.9, and node version 6.9.4. Any guidance or support would be greatly appreciated, thank you!

Here are snippets from my webpack.config:

module: {
  rules: [
    { test: /\ts$/, loader: @'ngtools/webpack }
  ]
}

plugins: [
  new webpack.NoEmitOnErrorsPlugin(),
  new AotPlugin({
    tsConfigPath: './tsconfig.json',
    entryModule: 'src/app/app.module#AppModule',
    mainPath: 'src/main'
    }),
  new webpack.optimize.UglifyJsPlugin({
    beautify: false,
    mangle: {
      screw_ie8: true,
      keep_fnames: true
    },
    compress: {
      warnings: false,
      screw_ie8: true
    },
    comments: false
  }),
  new ExtractTextPlugin('[name].[hash].css'),
  new webpack.DefinePlugin({
    'process.env': {
    'ENV': JSON.stringify(ENV)
    }
  })
]

Furthermore, here's a glimpse at my tsconfig.json file:

{
  "compilerOptions": {
    "baseUrl": "src",
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": false,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": true,
    "suppressImplicitAnyIndexErrors": true
  },
  "compileOnSave": false
}

Answer №1

After investigating the issue further, I discovered that the root cause was related to a path problem. I typically utilize a helper function for managing paths, but surprisingly overlooked using it in this particular scenario.

Here is the code for the helper function:

var path = require('path');

var _root = path.resolve(__dirname, '..');
function root(args) {
  args = Array.prototype.slice.call(arguments, 0);
  return path.join.apply(path, [_root].concat(args));
}

Below is an example of how to use this helper function:

entryModule: root('src', 'app', 'app.module#AppModule')

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