angular-cli/docs/documentation/build.md

ng build

Overview

ng build compiles the application into an output directory

Creating a build

ng build

The build artifacts will be stored in the dist/ directory.

Build Targets and Environment Files

ng build can specify both a build target (--target=production or --target=development) and an environment file to be used with that build (--environment=dev or --environment=prod). By default, the development build target and environment are used.

The mapping used to determine which environment file is used can be found in .angular-cli.json:

"environmentSource": "environments/environment.ts",
"environments": {
  "dev": "environments/environment.ts",
  "prod": "environments/environment.prod.ts"
}

These options also apply to the serve command. If you do not pass a value for environment, it will default to dev for development and prod for production.

# these are equivalent
ng build --target=production --environment=prod
ng build --prod --env=prod
ng build --prod
# and so are these
ng build --target=development --environment=dev
ng build --dev --e=dev
ng build --dev
ng build

You can also add your own env files other than dev and prod by doing the following:

• create a src/environments/environment.NAME.ts
• add { "NAME": 'src/environments/environment.NAME.ts' } to the apps[0].environments object in .angular-cli.json
• use them via the --env=NAME flag on the build/serve commands.

Base tag handling in index.html

When building you can modify base tag (<base href="/">) in your index.html with --base-href your-url option.

# Sets base tag href to /myUrl/ in your index.html
ng build --base-href /myUrl/
ng build --bh /myUrl/

Bundling

All builds make use of bundling, and using the --prod flag in ng build --prod or ng serve --prod will also make use of uglifying and tree-shaking functionality.

Options

--aot Build using Ahead of Time compilation.

--app Specifies app name or index to use.

--base-href (-bh) Base url for the application being built.

--deploy-url (-d) URL where files will be deployed.

--dev Build target and environment to development.

--output-path (-op) path where output will be placed

--environment (-e) Defines the build environment.

--extract-css (-ec) Extract css from global styles onto css files instead of js ones.

--i18n-file Localization file to use for i18n.

--i18n-format Format of the localization file specified with --i18n-file.

--locale Locale to use for i18n.

--output-hashing Define the output filename cache-busting hashing mode.

--output-path (-op) Path where output will be placed.

--poll Enable and define the file watching poll time period (milliseconds).

--prod Build target and environment to production.

--progress (-pr) Log progress to the console while building.

--sourcemap (-sm) Output sourcemaps.

--stats-json Generates a stats.json file which can be analyzed using tools such as: webpack-bundle-analyzer or https://webpack.github.io/analyse.

--target (-t) Defines the build target.

--vendor-chunk (-vc) Use a separate bundle containing only vendor libraries.

--verbose (-v) Adds more details to output logging.

--watch (-w) Run build when files change.