fix(@angular-devkit/build-angular): update ssr option definition

This commits updates the `ssr` application builder option definition. The main change is that now the option does not accept the entry-point as a value. Instead it should be passed in the `entry` suboption.

Example
```json
"ssr": {
    "entry": "server.ts"
}
```

This change in this option is important to allow us in the future to add additional sub options. Like potentially a `platform` or `target`.

Author: alan-agius4

packages/angular_devkit/build_angular/src/builders/application/options.ts

@@ -210,9 +210,11 @@ export async function normalizeOptions(
   let ssrOptions;
   if (options.ssr === true) {
     ssrOptions = {};
-  } else if (typeof options.ssr === 'string') {
+  } else if (typeof options.ssr === 'object') {
+    const { entry } = options.ssr;
+
     ssrOptions = {
-      entry: path.join(workspaceRoot, options.ssr),
+      entry: entry && path.join(workspaceRoot, entry),
     };
   }
 

packages/angular_devkit/build_angular/src/builders/application/schema.json

@@ -447,8 +447,14 @@
           "description": "Enable the server bundles to be written to disk."
         },
         {
-          "type": "string",
-          "description": "The server entry-point that when executed will spawn the web server."
+          "type": "object",
+          "properties": {
+            "entry": {
+              "type": "string",
+              "description": "The server entry-point that when executed will spawn the web server."
+            }
+          },
+          "additionalProperties": false
         }
       ]
     },

packages/schematics/angular/ssr/index.ts

@@ -116,7 +116,9 @@ function updateApplicationBuilderWorkspaceConfigRule(
     buildTarget.options = {
       ...buildTarget.options,
       prerender: true,
-      ssr: join(normalize(projectRoot), 'server.ts'),
+      ssr: {
+        entry: join(normalize(projectRoot), 'server.ts'),
+      },
     };
   });
 }