feat(@angular-devkit/build-angular): provide default and abbreviated build target support for dev-server and extract-i18n

The `buildTarget` options for both the `dev-server` and `extract-i8n` builders
now have default values that reflect the recommended and new project generated
values. The defaults are as follows where `<current-project>` is the name of the project
where the `dev-server` or `extract-i18n` builder target is located:
* `dev-server` --> `<current-project>:build:development`
* `extract-i18n` --> `<current-project>:build`

Additionally, abbreviated target specifiers are now supported for these
options. This allows target specifiers such as `::production` which would expand
to `<current-project>:build:production` for either builder.
Abbreviated target specifiers are only supported for the `buildTarget` option in
the `dev-server` and `extract-i18n` builders.

goldens/public-api/angular_devkit/architect/index.md

@@ -503,7 +503,7 @@ namespace strategy {
 export type Target = json.JsonObject & Target_2;
 
 // @public
-export function targetFromTargetString(str: string): Target;
+export function targetFromTargetString(specifier: string, abbreviatedProjectName?: string, abbreviatedTargetName?: string): Target;
 
 // @public
 export function targetStringFromTarget({ project, target, configuration }: Target): string;

packages/angular_devkit/architect/src/api.ts

@@ -330,17 +330,22 @@ export function targetStringFromTarget({ project, target, configuration }: Targe
 }
 
 /**
- * Return a Target tuple from a string.
+ * Return a Target tuple from a specifier string.
+ * Supports abbreviated target specifiers (examples: `::`, `::development`, or `:build:production`).
  */
-export function targetFromTargetString(str: string): Target {
+export function targetFromTargetString(
-  const tuple = str.split(/:/, 3);
+  specifier: string,
+  abbreviatedProjectName?: string,
+  abbreviatedTargetName?: string,
+): Target {
+  const tuple = specifier.split(':', 3);
   if (tuple.length < 2) {
-    throw new Error('Invalid target string: ' + JSON.stringify(str));
+    throw new Error('Invalid target string: ' + JSON.stringify(specifier));
   }
 
   return {
-    project: tuple[0],
+    project: tuple[0] || abbreviatedProjectName || '',
-    target: tuple[1],
+    target: tuple[1] || abbreviatedTargetName || '',
     ...(tuple[2] !== undefined && { configuration: tuple[2] }),
   };
 }

packages/angular_devkit/build_angular/src/builders/dev-server/options.ts

@@ -34,8 +34,9 @@ export async function normalizeOptions(
 
   const cacheOptions = normalizeCacheOptions(projectMetadata, workspaceRoot);
 
-  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+  // Target specifier defaults to the current project's build target using a development configuration
-  const buildTarget = targetFromTargetString(options.buildTarget ?? options.browserTarget!);
+  const buildTargetSpecifier = options.buildTarget ?? options.browserTarget ?? `::development`;
+  const buildTarget = targetFromTargetString(buildTargetSpecifier, projectName, 'build');
 
   // Initial options to keep
   const {

packages/angular_devkit/build_angular/src/builders/dev-server/schema.json

@@ -13,7 +13,7 @@
     "buildTarget": {
       "type": "string",
       "description": "A build builder target to serve in the format of `project:target[:configuration]`. You can also pass in more than one configuration name as a comma-separated list. Example: `project:target:production,staging`.",
-      "pattern": "^[^:\\s]+:[^:\\s]+(:[^\\s]+)?$"
+      "pattern": "^[^:\\s]*:[^:\\s]*(:[^\\s]+)?$"
     },
     "port": {
       "type": "number",

packages/angular_devkit/build_angular/src/builders/extract-i18n/options.ts

@@ -33,8 +33,9 @@ export async function normalizeOptions(
   const projectMetadata = await context.getProjectMetadata(projectName);
   const projectRoot = path.join(workspaceRoot, (projectMetadata.root as string | undefined) ?? '');
 
-  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+  // Target specifier defaults to the current project's build target with no specified configuration
-  const buildTarget = targetFromTargetString(options.buildTarget ?? options.browserTarget!);
+  const buildTargetSpecifier = options.buildTarget ?? options.browserTarget ?? ':';
+  const buildTarget = targetFromTargetString(buildTargetSpecifier, projectName, 'build');
 
   const i18nOptions = createI18nOptions(projectMetadata);
 

packages/angular_devkit/build_angular/src/builders/extract-i18n/schema.json

@@ -13,7 +13,7 @@
     "buildTarget": {
       "type": "string",
       "description": "A builder target to extract i18n messages in the format of `project:target[:configuration]`. You can also pass in more than one configuration name as a comma-separated list. Example: `project:target:production,staging`.",
-      "pattern": "^[^:\\s]+:[^:\\s]+(:[^\\s]+)?$"
+      "pattern": "^[^:\\s]*:[^:\\s]*(:[^\\s]+)?$"
     },
     "format": {
       "type": "string",