feat(@angular/cli): add --defaults option to ng new

Any option with a default value will not be prompted (if a prompt is defined) and the default will be used instead.

Closes #12084

Author: clydin

packages/angular/cli/commands/new-impl.ts

@@ -58,6 +58,7 @@ export class NewCommand extends SchematicCommand {
       dryRun: options.dryRun,
       force: options.force,
       interactive: options.interactive,
+      defaults: options.defaults,
     });
   }
 
@@ -72,6 +73,7 @@ export class NewCommand extends SchematicCommand {
     delete opts.verbose;
     delete opts.collection;
     delete opts.interactive;
+    delete opts.defaults;
 
     return opts;
   }

packages/angular/cli/commands/new.json

@@ -38,6 +38,11 @@
       "type": "boolean",
       "default": "true",
       "description": "Disables interactive inputs (i.e., prompts)."
+    },
+    "defaults": {
+      "type": "boolean",
+      "default": "false",
+      "description": "Disables interactive inputs (i.e., prompts) for options with a default."
     }
   },
   "required": []

packages/angular/cli/models/schematic-command.ts

@@ -62,6 +62,7 @@ export interface RunSchematicOptions {
   force: boolean;
   showNothingDone?: boolean;
   interactive?: boolean;
+  defaults?: boolean;
 }
 
 export interface GetOptionsOptions {
@@ -282,6 +283,11 @@ export abstract class SchematicCommand extends Command {
     });
 
     if (options.interactive !== false && process.stdout.isTTY) {
+      if (options.defaults) {
+        (workflow.registry as schema.CoreSchemaRegistry)
+          .addPreTransform(schema.transforms.addUndefinedDefaults);
+      }
+
       workflow.registry.usePromptProvider((definitions: Array<schema.PromptDefinition>) => {
         const questions: inquirer.Questions = definitions.map(definition => {
           const question: inquirer.Question = {