fix: render shadow slotted content for no template case

Author: jhefferman-sfdc

packages/@lwc/engine-server/src/__tests__/fixtures/slots-basic/implicit-no-template/shadow/expected.html

@@ -1,10 +1,12 @@
 <x-outer>
-  <x-inner>
-    <template shadowrootmode="open">
-    </template>
-    slotted content
-    <h2 slot="bob">
-      more content
-    </h2>
-  </x-inner>
+  <template shadowrootmode="open">
+    <x-inner>
+      <template shadowrootmode="open">
+      </template>
+      I am default slot
+      <div slot="foo">
+        I am the foo slot
+      </div>
+    </x-inner>
+  </template>
 </x-outer>

packages/@lwc/engine-server/src/__tests__/fixtures/slots-basic/implicit-no-template/shadow/modules/x/outer/outer.html

@@ -1,6 +1,6 @@
 <template>
     <x-inner>
-        slotted content
-        <h2 slot="bob">more content</h2>
+        I am default slot
+        <div slot="foo">I am the foo slot</div>
     </x-inner>
 </template>

packages/@lwc/engine-server/src/__tests__/fixtures/slots-basic/implicit-no-template/shadow/modules/x/outer/outer.js

@@ -1,5 +1,3 @@
 import { LightningElement } from 'lwc';
 
-export default class extends LightningElement {
-    static renderMode = 'light';
-}
+export default class extends LightningElement {}

packages/@lwc/ssr-runtime/src/render.ts

@@ -109,7 +109,9 @@ export function* fallbackTmpl(
 ) {
     if (Cmp.renderMode !== 'light') {
         yield `<template shadowrootmode="open"></template>`;
-        renderSlottedContent(_lightSlottedContent, _instance);
+        if (_shadowSlottedContent) {
+            yield _shadowSlottedContent(_instance);
+        }
     }
 }
 
@@ -123,17 +125,8 @@ export function fallbackTmplNoYield(
 ) {
     if (Cmp.renderMode !== 'light') {
         emit(`<template shadowrootmode="open"></template>`);
-        renderSlottedContent(_lightSlottedContent, emit);
-    }
-}
-
-function renderSlottedContent(_lightSlottedContent: any, contextfulParent: any) {
-    if (_lightSlottedContent) {
-        for (const slotName in _lightSlottedContent) {
-            const generators = _lightSlottedContent[slotName];
-            for (let i = 0; i < generators.length; i++) {
-                generators[i](contextfulParent, null, slotName);
-            }
+        if (_shadowSlottedContent) {
+            _shadowSlottedContent(emit, _instance);
         }
     }
 }