refactor(schematics): migrate from styleext to style (#2254)

Closes #2248

BREAKING CHANGES:

To be inline with the Angular CLI, the `styleExt` option has been changed to `style`.

BEFORE:

```
"@schematics/angular:component": {
      "inlineStyle": true,
      "prefix": "aio",
      "styleext": "scss"
    }
...
```

AFTER:

```
"@schematics/angular:component": {
      "inlineStyle": true,
      "prefix": "aio",
      "style": "scss"
    }
....
```

Author: Jefiozie

angular.json

@@ -107,7 +107,7 @@
       "flat": true,
       "spec": false,
       "prefix": "bc",
-      "styleext": "css"
+      "style": "css"
     },
     "@schematics/angular:directive": {
       "prefix": "bc"

modules/schematics/src/container/index.spec.ts

@@ -21,7 +21,7 @@ describe('Container Schematic', () => {
     inlineStyle: false,
     inlineTemplate: false,
     changeDetection: 'Default',
-    styleext: 'css',
+    style: 'css',
     spec: true,
     module: undefined,
     export: false,

modules/schematics/src/container/schema.json

@@ -55,8 +55,9 @@
       "description": "The prefix to apply to generated selectors.",
       "alias": "p"
     },
-    "styleext": {
-      "description": "The file extension to be used for style files.",
+    "style": {
+      "description":
+        "The file extension or preprocessor to use for style files.",
       "type": "string",
       "default": "css"
     },

modules/schematics/src/container/schema.ts

@@ -32,9 +32,9 @@ export interface Schema {
    */
   prefix?: string;
   /**
-   * The file extension to be used for style files.
+   * The file extension or preprocessor to use for style files.
    */
-  styleext?: string;
+  style?: string;
   /**
    * Specifies if a spec file is generated.
    */

projects/ngrx.io/angular.json

@@ -173,7 +173,7 @@
     "@schematics/angular:component": {
       "inlineStyle": true,
       "prefix": "aio",
-      "styleext": "scss"
+      "style": "scss"
     },
     "@schematics/angular:directive": {
       "prefix": "aio"

projects/ngrx.io/content/guide/schematics/container.md

@@ -55,7 +55,7 @@ If you want to generate a container with an scss file, add `@ngrx/schematics:con
 ```json
 "schematics": {
   "@ngrx/schematics:container": {
-    "styleext": "scss"
+    "style": "scss"
   }
 }
 ```

projects/ngrx.io/content/guide/schematics/index.md

@@ -56,7 +56,7 @@ The `@ngrx/schematics` extend the default `@schematics/angular` collection. If y
 ```json
 "schematics": {
   "@ngrx/schematics:component": {
-    "styleext": "scss"
+    "style": "scss"
   }
 }
 ```