feat(@angular-devkit/schematics): support schema validation in NodeWo…

…rkflow

This change provides an additional NodeWorkflow option `schemaValidation`.  When enabled, this new option will setup schema-based validation of a schematics options prior to schematic execution.  The schema registry provided with the NodeWorkflow is used to perform the validation.  This new option removes the need to manually configure validation of schematic options when initializing a schematic runtime.

packages/angular_devkit/schematics/tools/workflow/node-workflow.ts

@@ -13,6 +13,7 @@ import {
 import { BuiltinTaskExecutor } from '../../tasks/node';
 import { FileSystemEngine } from '../description';
 import { NodeModulesEngineHost } from '../node-module-engine-host';
+import { validateOptionsWithSchema } from '../schema-option-transform';
 
 /**
  * A workflow specifically for Node tools.
@@ -25,6 +26,7 @@ export class NodeWorkflow extends workflow.BaseWorkflow {
     packageRegistry?: string;
     registry?: schema.CoreSchemaRegistry;
     resolvePaths?: string[],
+    schemaValidation?: boolean;
   });
 
   constructor(
@@ -37,6 +39,7 @@ export class NodeWorkflow extends workflow.BaseWorkflow {
       packageRegistry?: string;
       registry?: schema.CoreSchemaRegistry;
       resolvePaths?: string[],
+      schemaValidation?: boolean;
     },
   );
 
@@ -50,6 +53,7 @@ export class NodeWorkflow extends workflow.BaseWorkflow {
       packageRegistry?: string;
       registry?: schema.CoreSchemaRegistry;
       resolvePaths?: string[],
+      schemaValidation?: boolean;
     },
   ) {
     let host;
@@ -90,6 +94,10 @@ export class NodeWorkflow extends workflow.BaseWorkflow {
     engineHost.registerTaskExecutor(BuiltinTaskExecutor.RunSchematic);
     engineHost.registerTaskExecutor(BuiltinTaskExecutor.TslintFix);
 
+    if (options.schemaValidation) {
+      engineHost.registerOptionsTransform(validateOptionsWithSchema(this.registry));
+    }
+
     this._context = [];
   }