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The javascript optimization pipeline is now a two-phase process. `esbuild` is used in the first phase to remove the majority of the unused code and shorten identifiers in each output bundle script. `esbuild` can accomplish this in a fraction of the time that `terser` previously required. However, `esbuild` does not yet implement all of the optimizations that `terser` performs. As a result, `terser` is used as a second phase to further optimize and reduce the size of the output bundle scripts. Since `terser` is operating on a smaller input size, the time required for `terser` to complete is significantly reduced. To further improve performance when source maps are enabled, the source map merging is now performed within the optimization workers. A maximum of four (4) optimization workers are currently used and this value can be adjusted via the `NG_BUILD_MAX_WORKERS` environment variable.
@angular-devkit/build-angular
This package contains Architect builders used to build and test Angular applications and libraries.
Builders
| Name | Description |
|---|---|
| app-shell | Build an Angular App shell. |
| browser | Build an Angular application targeting a browser environment. |
| dev-server | A development server that provides live reloading. |
| extract-i18n | Extract i18n messages from an Angular application. |
| karma | Execute unit tests using Karma test runner. |
| ng-packagr | Build and package an Angular library in Angular Package Format (APF) format using ng-packagr. |
| server | Build an Angular application targeting a Node.js environment. |
| protractor | Deprecated - Run end-to-end tests using Protractor framework. |
| tslint | Deprecated - Statically analyze TypeScript files using TSLint. |
Disclaimer
While the builders when executed via the Angular CLI and their associated options are considered stable, the programmatic APIs are not considered officially supported and are not subject to the breaking change guarantees of SemVer.