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angular-cn/aio/content/guide/workspace-config.md

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Angular Workspace Configuration

A file named angular.json at the root level of an Angular workspace provides workspace-wide and project-specific configuration defaults for build and development tools provided by the Angular CLI. Path values given in the configuration are relative to the root workspace folder.

Overall JSON structure

At the top level of angular.json, a few properties configure the workspace, and a projects section contains the remaining per-project configuration options.

  • version: The configuration-file version.
  • newProjectRoot: Path where new projects are created. Absolute or relative to the workspace folder.
  • defaultProject: Default project name to use in commands, where not provided as an argument. When you use ng new to create a new app in a new workspace, that app is the default project for the workspace until you change it here.
  • projects : Contains a subsection for each project (library, app, e2e test app) in the workspace, with the per-project configuration options.

The initial app that you create with ng new app_name is listed under "projects", along with its corresponding end-to-end test app:

projects app_name ... app_name-e2e ...

Each additional app that you create with ng generate application has a corresponding end-to-end test project, with its own configuration section. When you create a library project with ng generate library, the library project is also added to the projects section.

Note that the projects section of the configuration file does not correspond exactly to the workspace file structure.

  • The initial app created by ng new is at the top level of the workspace file structure, along with its e2e app.
  • Additional apps, e2e apps, and libraries go into a projects folder in the workspace.

For more information, see Workspace and project file structure.

Project configuration options

The following top-level configuration properties are available for each project, under projects:<project_name>.

"my-v7-app": { "root": "", "sourceRoot": "src", "projectType": "application", "prefix": "app", "schematics": {}, "architect": {} }
PROPERTY DESCRIPTION
root The root folder for this project's files, relative to the workspace folder. Empty for the initial app, which resides at the top level of the workspace.
sourceRoot The root folder for this project's source files.
projectType One of "application" or "library". An application can run independently in a browser, while a library cannot. Both an app and its e2e test app are of type "application".
prefix A string that Angular prepends to generated selectors. Can be customized to identify an app or feature area.
schematics An object containing schematics that customize CLI commands for this project.
architect An object containing configuration defaults for Architect builder targets for this project.

Project tool configuration options

Architect is the tool that the CLI uses to perform complex tasks such as compilation and test running, according to provided configurations. The architect section contains a set of Architect targets. Many of the targets correspond to the CLI commands that run them. Some additional predefined targets can be run using the ng run command, and you can define your own targets.

Each target object specifies the builder for that target, which is the npm package for the tool that Architect runs. In addition, each target has an options section that configure default options for the target, and a configurations section that names and specifies alternative configurations for the target. See the example in Build target below.

"architect": { "build": { }, "serve": { }, "e2e" : { }, "test": { }, "lint": { }, "extract-i18n": { }, "server": { }, "app-shell": { } }

  • The architect/build section configures defaults for options of the ng build command. See Build target below for more information.

  • The architect/serve section overrides build defaults and supplies additional serve defaults for the ng serve command. In addition to the options available for the ng build command, it adds options related to serving the app.

  • The architect/e2e section overrides build-option defaults for building end-to-end testing apps using the ng e2e command.

  • The architect/test section overrides build-option defaults for test builds and supplies additional test-running defaults for the ng test command.

  • The architect/lint section configures defaults for options of the ng lint command, which performs code analysis on project source files. The default linting tool for Angular is TSLint.

  • The architect/extract-i18n section configures defaults for options of the ng-xi18n tool used by the ng xi18n command, which extracts marked message strings from source code and outputs translation files.

  • The architect/server section configures defaults for creating a Universal app with server-side rendering, using the ng run <project>:server command.

  • The architect/app-shell section configures defaults for creating an app shell for a progressive web app (PWA), using the ng run <project>:app-shell command.

In general, the options for which you can configure defaults correspond to the command options listed in the CLI reference page for each command. Note that all options in the configuration file must use camelCase, rather than dash-case.

{@a build-target}

Build target

The architect/build section configures defaults for options of the ng build command. It has the following top-level properties.

PROPERTY DESCRIPTION
builder The npm package for the build tool used to create this target. The default is @angular-devkit/build-angular:browser, which uses the webpack package bundler.
options This section contains defaults for build options, used when no named alternative configuration is specified. See Default build options below.
configurations This section defines and names alternative configurations for different intended destinations. It contains a section for each named configuration, which sets the default options for that intended environment. See Alternate build configurations below.

{@a build-configs}

Alternate build configurations

By default, a production configuration is defined, and the ng build command has --prod option that builds using this configuration. The production configuration sets defaults that optimize the app in a number of ways, such bundling files, minimizing excess whitespace, removing comments and dead code, and rewriting code to use short, cryptic names ("minification").

You can define and name additional alternate configurations (such as stage, for instance) appropriate to your development process. Some examples of different build configurations are stable, archive and next used by AIO itself, and the individual locale-specific configurations required for building localized versions of an app. For details, see Internationalization (i18n).

{@a build-props}

Additional build and test options

The configurable options for a default or targeted build generally correspond to the options available for the ng build, ng serve, and ng test commands. For details of those options and their possible values, see the CLI Reference.

Some additional options (listed below) can only be set through the configuration file, either by direct editing or with the ng config command.

OPTIONS PROPERTIES DESCRIPTION
fileReplacements An object containing files and their compile-time replacements.
stylePreprocessorOptions An object containing option-value pairs to pass to style preprocessors.
assets An object containing paths to static assets to add to the global context of the project. The default paths point to the project's icon file and its assets folder.
styles An object containing style files to add to the global context of the project. Angular CLI supports CSS imports and all major CSS preprocessors: sass/scss, less, and stylus.
scripts An object containing JavaScript script files to add to the global context of the project. The scripts are loaded exactly as if you had added them in a <script> tag inside index.html.
budgets Default size-budget type and threshholds for all or parts of your app. You can configure the builder to report a warning or an error when the output reaches or exceeds a threshold size. See Configure size budgets. (Not available in test section.)