fix(ivy): support directive outputs on ng-template (#25717)

Compiler part of #25698
Fixes #25697

PR Close #25717

packages/compiler-cli/test/compliance/r3_view_compiler_template_spec.ts

@@ -401,4 +401,43 @@ describe('compiler compliance: template', () => {
 
     expectEmit(result.source, template, 'Incorrect template');
   });
+
+  it('should support directive outputs on <ng-template>', () => {
+
+    const files = {
+      app: {
+        'spec.ts': `
+              import {Component, NgModule} from '@angular/core';
+
+              @Component({
+                selector: 'my-component',
+                template: '<ng-template (outDirective)="$event.doSth()"></ng-template>';
+              })
+              export class MyComponent {}
+
+              @NgModule({declarations: [MyComponent]})
+              export class MyModule {}
+          `
+      }
+    };
+
+    const template = `
+      const $t0_attrs$ = [${AttributeMarker.SelectOnly}, "outDirective"];
+
+      function Template_0(rf, ctx) { }
+
+      // ...
+
+      template: function MyComponent_Template(rf, ctx) {
+        if (rf & 1) {
+          $i0$.ɵtemplate(0, Template_0, 0, 0, null, $t0_attrs$);
+          $i0$.ɵlistener("outDirective", function MyComponent_Template_ng_template_outDirective_listener($event) { return $event.doSth(); });
+        }
+      }`;
+
+    const result = compile(files, angularFiles);
+
+    expectEmit(result.source, template, 'Incorrect template');
+
+  });
 });

packages/compiler/src/render3/view/template.ts

@@ -516,28 +516,9 @@ export class TemplateDefinitionBuilder implements t.Visitor<void>, LocalResolver
 
       // Generate Listeners (outputs)
       element.outputs.forEach((outputAst: t.BoundEvent) => {
-        const elName = sanitizeIdentifier(element.name);
-        const evName = sanitizeIdentifier(outputAst.name);
-        const functionName = `${this.templateName}_${elName}_${evName}_listener`;
-
-        this.creationInstruction(outputAst.sourceSpan, R3.listener, () => {
-          const listenerScope = this._bindingScope.nestedScope(this._bindingScope.bindingLevel);
-
-          const bindingExpr = convertActionBinding(
-              listenerScope, implicit, outputAst.handler, 'b',
-              () => error('Unexpected interpolation'));
-
-          const statements = [
-            ...listenerScope.restoreViewStatement(), ...listenerScope.variableDeclarations(),
-            ...bindingExpr.render3Stmts
-          ];
-
-          const handler = o.fn(
-              [new o.FnParam('$event', o.DYNAMIC_TYPE)], statements, o.INFERRED_TYPE, null,
-              functionName);
-
-          return [o.literal(outputAst.name), handler];
-        });
+        this.creationInstruction(
+            outputAst.sourceSpan, R3.listener,
+            this.prepareListenerParameter(element.name, outputAst));
       });
     }
 
@@ -736,6 +717,13 @@ export class TemplateDefinitionBuilder implements t.Visitor<void>, LocalResolver
           o.literal(templateVisitor.getVarCount()));
       return trimTrailingNulls(parameters);
     });
+
+    // Generate listeners for directive output
+    template.outputs.forEach((outputAst: t.BoundEvent) => {
+      this.creationInstruction(
+          outputAst.sourceSpan, R3.listener,
+          this.prepareListenerParameter('ng_template', outputAst));
+    });
   }
 
   // These should be handled in the template or element directly.
@@ -906,6 +894,31 @@ export class TemplateDefinitionBuilder implements t.Visitor<void>, LocalResolver
 
     return this.constantPool.getConstLiteral(asLiteral(refsParam), true);
   }
+
+  private prepareListenerParameter(tagName: string, outputAst: t.BoundEvent): () => o.Expression[] {
+    const evName = sanitizeIdentifier(outputAst.name);
+    const functionName = `${this.templateName}_${tagName}_${evName}_listener`;
+
+    return () => {
+
+      const listenerScope = this._bindingScope.nestedScope(this._bindingScope.bindingLevel);
+
+      const bindingExpr = convertActionBinding(
+          listenerScope, o.variable(CONTEXT_NAME), outputAst.handler, 'b',
+          () => error('Unexpected interpolation'));
+
+      const statements = [
+        ...listenerScope.restoreViewStatement(), ...listenerScope.variableDeclarations(),
+        ...bindingExpr.render3Stmts
+      ];
+
+      const handler = o.fn(
+          [new o.FnParam('$event', o.DYNAMIC_TYPE)], statements, o.INFERRED_TYPE, null,
+          functionName);
+
+      return [o.literal(outputAst.name), handler];
+    };
+  }
 }
 
 export class ValueConverter extends AstMemoryEfficientTransformer {

packages/core/src/render3/STATUS.md

@@ -158,7 +158,7 @@ The goal is for the `@Component` (and friends) to be the compiler of template. S
 | `<div (keyup.enter)>`                       |  ❌     |  ❌      |  ❌      |
 | `<div (hammer.js)>`                         |  ❌     |  ❌      |  ❌      |
 | [`<div (directiveOut)>`][gh23560]           |  ✅     |  ✅      |  ✅     |
-| [`<ng-template (directiveOut)>`][gh23561]   |  ❌     |  ❌      |  ❌      |
+| [`<ng-template (directiveOut)>`][gh23561]   |  ✅     |  ✅      |  ✅      |
 | [`<ng-container>`][gh24381]                 |  ✅     |  ✅      |  ✅      |
 
 [gh23560]: https://github.com/angular/angular/issues/23560