fix(core): Support JSX in signals

Fix #4966
Fix #3530

.vscode/launch.json

@@ -33,13 +33,13 @@
     },
     {
       "type": "node",
-      "name": "vscode-jest-tests",
+      "name": "vitest",
       "request": "launch",
       "console": "integratedTerminal",
       "internalConsoleOptions": "neverOpen",
-      "program": "${workspaceFolder}/node_modules/jest/bin/jest.js",
+      "program": "${workspaceFolder}/./node_modules/vitest/vitest.mjs",
       "cwd": "${workspaceFolder}",
-      "args": ["--runInBand", "--watchAll=false"]
+      "args": ["--threads=false", "packages/qwik/src/core/container/render.unit.tsx"]
     }
   ]
 }

packages/qwik/src/core/container/render.unit.tsx

@@ -0,0 +1,138 @@
+import { assert, suite, test } from 'vitest';
+import type { JSXNode } from '../../jsx-runtime';
+import { renderToString } from '../../server/render';
+import { createDocument } from '../../testing/document';
+import { createDOM } from '../../testing/library';
+import { component$ } from '../component/component.public';
+import { _fnSignal } from '../internal';
+import { useSignal } from '../use/use-signal';
+
+suite('jsx signals', () => {
+  const RenderJSX = component$(() => {
+    const jsx = useSignal<string | JSXNode>(<span>SSR</span>);
+    return (
+      <>
+        <button
+          class="set-jsx"
+          onJsx$={(e: CustomEvent<JSXNode | string>) => (jsx.value = e.detail)}
+        />
+        <div class="jsx">{jsx.value}</div>
+        <div class="jsx-signal">{_fnSignal((p0) => p0.value, [jsx], 'p0.value')}</div>
+      </>
+    );
+  });
+
+  test.skip('SSR jsx', async () => {
+    const output = await renderToString(<RenderJSX />, { containerTagName: 'div' });
+    const document = createDocument();
+    document.body.innerHTML = output.html;
+    const div = document.querySelector('.jsx')!;
+    assert.equal(div.innerHTML, '<span>SSR</span>');
+    const divSignal = document.querySelector('.jsx-signal')!;
+    assert.equal(divSignal.innerHTML, '<!--t=1--><span>SSR</span><!---->');
+  });
+
+  test('CSR basic jsx', async () => {
+    const { screen, render, userEvent } = await createDOM();
+
+    await render(<RenderJSX />);
+    const div = screen.querySelector('.jsx')!;
+    const divSignal = screen.querySelector('.jsx-signal')!;
+    assert.equal(div.innerHTML, '<span>SSR</span>');
+    assert.equal(divSignal.innerHTML, '<span>SSR</span>');
+
+    await userEvent('.set-jsx', 'jsx', { detail: 'text' });
+    assert.equal(div.innerHTML, 'text');
+    assert.equal(divSignal.innerHTML, 'text');
+
+    await userEvent('.set-jsx', 'jsx', { detail: <i>i</i> });
+    assert.equal(div.innerHTML, '<i>i</i>');
+    assert.equal(divSignal.innerHTML, '<i>i</i>');
+
+    await userEvent('.set-jsx', 'jsx', { detail: <b>b</b> });
+    assert.equal(div.innerHTML, '<b>b</b>');
+    assert.equal(divSignal.innerHTML, '<b>b</b>');
+
+    await userEvent('.set-jsx', 'jsx', { detail: <>v</> });
+    assert.equal(div.innerHTML, 'v');
+    assert.equal(divSignal.innerHTML, 'v');
+
+    await userEvent('.set-jsx', 'jsx', { detail: <b>b</b> });
+    assert.equal(div.innerHTML, '<b>b</b>');
+    assert.equal(divSignal.innerHTML, '<b>b</b>');
+
+    await userEvent('.set-jsx', 'jsx', { detail: 'text' });
+    assert.equal(div.innerHTML, 'text');
+    assert.equal(divSignal.innerHTML, 'text');
+  });
+
+  test('CSR jsx primitives', async () => {
+    const { screen, render, userEvent } = await createDOM();
+
+    await render(<RenderJSX />);
+    const div = screen.querySelector('.jsx')!;
+    const divSignal = screen.querySelector('.jsx-signal')!;
+    assert.equal(div.innerHTML, '<span>SSR</span>');
+    assert.equal(divSignal.innerHTML, '<span>SSR</span>');
+
+    await userEvent('.set-jsx', 'jsx', { detail: true });
+    assert.equal(div.innerHTML, '');
+    assert.equal(divSignal.innerHTML, '');
+
+    await userEvent('.set-jsx', 'jsx', { detail: 0 });
+    assert.equal(div.innerHTML, '0');
+    assert.equal(divSignal.innerHTML, '0');
+  });
+
+  test('CSR jsx arrays', async () => {
+    const { screen, render, userEvent } = await createDOM();
+
+    await render(<RenderJSX />);
+    const div = screen.querySelector('.jsx')!;
+    const divSignal = screen.querySelector('.jsx-signal')!;
+    assert.equal(div.innerHTML, '<span>SSR</span>');
+    assert.equal(divSignal.innerHTML, '<span>SSR</span>');
+
+    await userEvent('.set-jsx', 'jsx', { detail: [] });
+    assert.equal(div.innerHTML, '');
+    assert.equal(divSignal.innerHTML, '<!--qv --><!--/qv-->');
+
+    await userEvent('.set-jsx', 'jsx', { detail: ['text', <b>b</b>] });
+    assert.equal(div.innerHTML, 'text<b>b</b>');
+    assert.equal(divSignal.innerHTML, '<!--qv -->text<b>b</b><!--/qv-->');
+  });
+
+  test.skip('CSR jsx Promises', async () => {
+    // Render signals that resolves promise is not supported
+    const { screen, render, userEvent } = await createDOM();
+
+    await render(<RenderJSX />);
+    const div = screen.querySelector('.jsx')!;
+    const divSignal = screen.querySelector('.jsx-signal')!;
+    assert.equal(div.innerHTML, '<span>SSR</span>');
+    assert.equal(divSignal.innerHTML, '<span>SSR</span>');
+
+    await userEvent('.set-jsx', 'jsx', { detail: Promise.resolve('Test') });
+    assert.equal(div.innerHTML, 'Test');
+    assert.equal(divSignal.innerHTML, 'Test');
+  });
+
+  const ChildComp = component$(() => <span>ChildComp</span>);
+
+  test('CSR jsx with component', async () => {
+    // Render signals that resolves promise is not supported
+    const { screen, render, userEvent } = await createDOM();
+
+    await render(<RenderJSX />);
+    const div = screen.querySelector('.jsx')!;
+    const divSignal = screen.querySelector('.jsx-signal')!;
+    assert.equal(div.innerHTML, '<span>SSR</span>');
+    assert.equal(divSignal.innerHTML, '<span>SSR</span>');
+
+    await userEvent('.set-jsx', 'jsx', {
+      detail: <ChildComp />,
+    });
+    assert.equal(div.innerHTML, '<!--qv --><span>ChildComp</span><!--/qv-->');
+    assert.equal(divSignal.innerHTML, '<!--qv --><span>ChildComp</span><!--/qv-->');
+  });
+});

packages/qwik/src/core/render/dom/notify-render.ts

@@ -176,7 +176,7 @@ const renderMarked = async (containerState: ContainerState): Promise<void> => {
     }
 
     signalOperations.forEach((op) => {
-      executeSignalOperation(staticCtx, op);
+      executeSignalOperation(rCtx, op);
     });
 
     // Add post operations

packages/qwik/src/core/render/dom/operations.ts

@@ -205,6 +205,7 @@ export const createTemplate = (doc: Document, slotName: string) => {
 
 export const executeDOMRender = (staticCtx: RenderStaticContext) => {
   for (const op of staticCtx.$operations$) {
+    // PERF(misko): polymorphic execution
     op.$operation$.apply(undefined, op.$args$);
   }
   resolveSlotProjection(staticCtx);

packages/qwik/src/core/render/dom/render-dom.ts

@@ -165,10 +165,11 @@ export const processData = (
   } else if (isJSXNode(node)) {
     return processNode(node, invocationContext);
   } else if (isSignal(node)) {
-    const newNode = new ProcessedJSXNodeImpl('#text', EMPTY_OBJ, null, EMPTY_ARRAY, 0, null);
+    const newNode = new ProcessedJSXNodeImpl('#signal', EMPTY_OBJ, null, EMPTY_ARRAY, 0, null);
     newNode.$signal$ = node;
     return newNode;
   } else if (isArray(node)) {
+    // PERF(misko): possible place to make it faster by not creating promises unnecessarily
     const output = promiseAll(node.flatMap((n) => processData(n, invocationContext)));
     return maybeThen(output, (array) => array.flat(100).filter(isNotNullable));
   } else if (isPromise(node)) {

packages/qwik/src/core/render/dom/signals.ts

@@ -1,18 +1,20 @@
 import type { SubscriberSignal } from '../../state/common';
-import { tryGetContext } from '../../state/context';
+import { getContext, tryGetContext } from '../../state/context';
 import { trackSignal } from '../../use/use-core';
-import { jsxToString, serializeClassWithHost, stringifyStyle } from '../execute-component';
-import type { RenderStaticContext } from '../types';
-import { setProperty } from './operations';
-import { getVdom } from './render-dom';
-import { smartSetProperty, SVG_NS } from './visitor';
+import { logError } from '../../util/log';
+import { serializeClassWithHost, stringifyStyle } from '../execute-component';
+import type { RenderContext } from '../types';
+import { insertBefore, removeNode } from './operations';
+import { getVdom, processData, type ProcessedJSXNode } from './render-dom';
+import type { QwikElement } from './virtual-element';
+import { SVG_NS, createElm, diffVnode, getVnodeFromEl, smartSetProperty } from './visitor';
+import { Virtual, JSXNodeImpl } from '../jsx/jsx-runtime';
+import { isPromise } from '../../util/promises';
 
-export const executeSignalOperation = (
-  staticCtx: RenderStaticContext,
-  operation: SubscriberSignal
-) => {
+export const executeSignalOperation = (rCtx: RenderContext, operation: SubscriberSignal) => {
   try {
     const type = operation[0];
+    const staticCtx = rCtx.$static$;
     switch (type) {
       case 1:
       case 2: {
@@ -49,13 +51,48 @@ export const executeSignalOperation = (
       }
       case 3:
       case 4: {
-        const elm: Text = operation[3] as Text;
-
+        const elm = operation[3];
         if (!staticCtx.$visited$.includes(elm)) {
           // assertTrue(elm.isConnected, 'text node must be connected to the dom');
           staticCtx.$containerState$.$subsManager$.$clearSignal$(operation);
-          const value = trackSignal(operation[2], operation.slice(0, -1) as any);
-          return setProperty(staticCtx, elm, 'data', jsxToString(value));
+          const signal = operation[2];
+          // MISKO: I believe no `invocationContext` is OK because the JSX in signal
+          // has already been converted to JSX and there is nothing to execute there.
+          const invocationContext = undefined;
+          let signalValue = signal.value;
+          if (Array.isArray(signalValue)) {
+            signalValue = new JSXNodeImpl<typeof Virtual>(Virtual, {}, null, signalValue, 0, null);
+          }
+          let newVnode = processData(signalValue, invocationContext) as
+            | ProcessedJSXNode
+            | undefined;
+          if (isPromise(newVnode)) {
+            logError('Rendering promises in JSX signals is not supported');
+          } else {
+            if (newVnode === undefined) {
+              newVnode = processData('', invocationContext) as ProcessedJSXNode;
+            }
+            const oldVnode = getVnodeFromEl(elm);
+            rCtx.$cmpCtx$ = getContext(operation[1] as QwikElement, rCtx.$static$.$containerState$);
+            if (
+              oldVnode.$type$ == newVnode.$type$ &&
+              oldVnode.$key$ == newVnode.$key$ &&
+              oldVnode.$id$ == newVnode.$id$
+            ) {
+              diffVnode(rCtx, oldVnode, newVnode, 0);
+            } else {
+              const promises: Promise<any>[] = []; // TODO(misko): hook this up
+              const oldNode = oldVnode.$elm$;
+              const newElm = createElm(rCtx, newVnode, 0, promises);
+              if (promises.length) {
+                logError('Rendering promises in JSX signals is not supported');
+              }
+              operation[3] = newElm;
+              insertBefore(rCtx.$static$, elm.parentElement!, newElm, oldNode);
+              oldNode && removeNode(staticCtx, oldNode);
+            }
+          }
+          trackSignal(operation[2], operation.slice(0, -1) as any);
         }
       }
     }