add provideedIn support

Author: topce

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/TypeScriptAngularClientCodegen.java

@@ -30,6 +30,7 @@ public class TypeScriptAngularClientCodegen extends AbstractTypeScriptClientCode
     public static final String WITH_INTERFACES = "withInterfaces";
     public static final String TAGGED_UNIONS ="taggedUnions";
     public static final String NG_VERSION = "ngVersion";
+    public static final String PROVIDED_IN_ROOT ="providedInRoot";
 
     protected String npmName = null;
     protected String npmVersion = "1.0.0";
@@ -63,6 +64,9 @@ public TypeScriptAngularClientCodegen() {
         this.cliOptions.add(new CliOption(TAGGED_UNIONS,
             "Use discriminators to create tagged unions instead of extending interfaces.",
             BooleanProperty.TYPE).defaultValue(Boolean.FALSE.toString()));
+        this.cliOptions.add(new CliOption(PROVIDED_IN_ROOT,
+            "Use this property to provide Injectables in root (it is only valid in angular version greater or equal to 6.0.0).",
+            BooleanProperty.TYPE).defaultValue(Boolean.FALSE.toString()));
         this.cliOptions.add(new CliOption(NG_VERSION, "The version of Angular. Default is '4.3'"));
     }
 
@@ -123,6 +127,10 @@ public void processOpts() {
             taggedUnions = Boolean.parseBoolean(additionalProperties.get(TAGGED_UNIONS).toString());
         }
 
+        if (additionalProperties.containsKey(PROVIDED_IN_ROOT) && !ngVersion.atLeast("6.0.0")) {
+            additionalProperties.put(PROVIDED_IN_ROOT,false);
+        }
+
         additionalProperties.put(NG_VERSION, ngVersion);
         additionalProperties.put("injectionToken", ngVersion.atLeast("4.0.0") ? "InjectionToken" : "OpaqueToken");
         additionalProperties.put("injectionTokenTyped", ngVersion.atLeast("4.0.0"));

modules/swagger-codegen/src/main/resources/typescript-angular/api.service.mustache

@@ -41,7 +41,14 @@ import { {{classname}}Interface }                            from './{{classFile
  * {{&description}}
  */
 {{/description}}
+{{^providedInRoot}}
 @Injectable()
+{{/providedInRoot}}
+{{#providedInRoot}}
+@Injectable({
+  providedIn: 'root',
+})
+{{/providedInRoot}}
 {{#withInterfaces}}
 export class {{classname}} implements {{classname}}Interface {
 {{/withInterfaces}}