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angularbuildproductionangular-cli

Angular 2 with CLI - build for production

I have freshly installed angular-cli 1.0.0.beta.17 (latest one), start new project, able to serve project on port 4200 with no problems - just standard "app works!" message.

However when I try to build for production this empty and generic application by using command ng build --prod I do not have main.*.js file created at all and have a few screens of warnings like:

  • Dropping unused function...
  • Site effects in initialization...
  • etc

This is a brand new empty project - I did not have a chance to break anything yet...

How to build production version ?

Solution

  • Updated for Angular v16+

    # Prod - these are equivalent
ng build --configuration=production
ng build --c=production
ng build 

# Dev - and so are these
ng build --configuration=development
ng build --c=development

    More flag settings here https://angular.io/cli/build

    Legacy code below this line

    Updated for Angular v6+

    # Prod - these are equivalent
ng build --configuration=production
ng build --c=production
ng build --prod=true

# Dev - and so are these
ng build --configuration=development
ng build --c=development
ng build --prod=false
ng build

    Per Angular-cli's github wiki v2+, these are the most common ways to initiate a dev and production build

    # Prod these are equivalent
ng build --target=production --environment=prod
ng build --prod --env=prod
ng build --prod

# Dev and so are these
ng build --target=development --environment=dev
ng build --dev --env=dev
ng build --dev
ng build

    There are different default flags that will affect --dev vs --prod builds.

    Flag                 --dev      --prod
--aot                false      true
--environment        dev        prod
--output-hashing     media      all
--sourcemaps         true       false
--extract-css        false      true

    --prod also sets the following non-flaggable settings:

    • Adds service worker if configured in .angular-cli.json.
    • Replaces process.env.NODE_ENV in modules with the production value (this is needed for some libraries, like react).
    • Runs UglifyJS on the code.

    Original:

    I need to do some troubleshooting in order to get AOT working. When I ran:

    ng build --prod --aot=false

    I would get will return a error similar to

    Module not found: Error: Can't resolve './$$_gendir/app/app.module.ngfactory'

    Originally, I had to do some project refactoring to get AOT to work. However, they may be a fix if you are encountering this error. Try

    npm i [email protected]

    https://github.com/angular/angular-cli/issues/7113