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

--watch (-w) rebuild when files change

--target (-t) define the build target

--environment (-e) defines the build environment

--prod flag to set build target and environment to production

--dev flag to set build target and environment to development

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

--aot flag whether to build using Ahead of Time compilation

--sourcemap (-sm) output sourcemaps

--vendor-chunk (-vb) use a separate bundle containing only vendor libraries

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

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

--verbose (-v) adds more details to output logging

--progress (-pr) log progress to the console while building

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

--output-hashing define the output filename cache-busting hashing mode

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

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