Encountering ng build --prod errors following Angular2 to Angular4 upgrade

Upon completing the upgrade of my Angular2 project to Angular4 by executing the following command:

npm install @angular/common@latest @angular/compiler@latest @angular/compiler-cli@latest @angular/core@latest @angular/forms@latest @angular/http@latest @angular/platform-browser@latest @angular/platform-browser-dynamic@latest @angular/platform-server@latest @angular/router@latest @angular/animations@latest typescript@latest --save

An error message pops up when I run ng build --prod:

ERROR in ./src/main.ts
Module not found: Error: Can't resolve './$$_gendir/app/app.module.ngfactory' in 'D:\workspace\MyProject\src'
 @ ./src/main.ts 4:0-74
 @ multi ./src/main.ts

Interestingly, without the --prod flag no errors are reported. While there are similar queries on stackoverflow, none seem to address this specific issue post-upgrading to Angular4. Here's an excerpt from my package.json file:

{
  "name": "MyProject",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
   // List of dependencies...
  },
  "devDependencies": {
    // List of dev-dependencies...
  }
}

Edit. Below is a snippet of the project.json generated through ng new with the latest CLI version:

{
  "name": "mypro",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    // Project scripts...
  },
  "private": true,
  "dependencies": {
    // Latest dependencies...
  },
  "devDependencies": {
    // Latest development dependencies...
  }
}

Any insights or suggestions?

Answer №1

If you're struggling to get your application to build, try adding the --aot false parameter along with --prod. Here's an example:

ng build --prod --aot false

The default production build now uses AOT compilation mode, which may require some extra steps in your code. You can bypass this by setting the flag to false. The AOT Cookbook might provide useful guidance.

Although the GitHub wiki for ng build states that the default value for the --aot flag is false, it seems that isn't always the case. Running ng build --help doesn't reveal a default value, but using the flag proves it defaults to true.

In my experience, when encountering AOT issues, error messages typically offer more insight than what you've described. Look out for specific component names or indicators of where to troubleshoot. Often, errors stem from not explicitly declaring variables within a component - JIT may overlook this, but AOT is unforgiving.

I hope this information proves helpful in resolving your issue.

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