withastro · matthewp · May 23, 2023 · Apr 13, 2023 · Apr 13, 2023 · Apr 13, 2023
diff --git a/.changeset/good-parrots-work.md b/.changeset/good-parrots-work.md
@@ -0,0 +1,5 @@
+---
+'astro': minor
+---
+
+fix a bug when Fragment is as a slot
diff --git a/packages/astro/src/core/render/result.ts b/packages/astro/src/core/render/result.ts
@@ -18,6 +18,7 @@ import { renderJSX } from '../../runtime/server/jsx.js';
 import { AstroCookies } from '../cookies/index.js';
 import { AstroError, AstroErrorData } from '../errors/index.js';
 import { warn, type LogOptions } from '../logger/core.js';
+import { isHTMLString } from '../../runtime/server/escape.js';
 
 const clientAddressSymbol = Symbol.for('astro.clientAddress');
 const responseSentSymbol = Symbol.for('astro.responseSent');
@@ -108,9 +109,11 @@ class Slots {
 			// Astro
 			const expression = getFunctionExpression(component);
 			if (expression) {
-				const slot = () => expression(...args);
-				return await renderSlotToString(result, slot).then((res) =>
-					res != null ? String(res) : res
+				const slot = async () => isHTMLString(await expression) ? expression : expression(...args)
+				return await renderSlotToString(result, slot).then((res) =>{
+					return res != null ? String(res) : res
+				}
+
 				);
 			}
 			// JSX

diff --git a/packages/astro/src/runtime/server/render/slot.ts b/packages/astro/src/runtime/server/render/slot.ts
@@ -7,7 +7,7 @@ import { renderChild } from './any.js';
 
 type RenderTemplateResult = ReturnType<typeof renderTemplate>;
 export type ComponentSlots = Record<string, ComponentSlotValue>;
-export type ComponentSlotValue = (result: SSRResult) => RenderTemplateResult;
+export type ComponentSlotValue = (result: SSRResult) => RenderTemplateResult | Promise<RenderTemplateResult>;
 
 const slotString = Symbol.for('astro:slot-string');
 

diff --git a/packages/astro/test/fixtures/set-html/components/Slot.astro b/packages/astro/test/fixtures/set-html/components/Slot.astro
@@ -0,0 +1,2 @@
+
+<Fragment set:html={Astro.slots.render('name', ['arg'])} />
diff --git a/packages/astro/test/fixtures/set-html/src/pages/children.astro b/packages/astro/test/fixtures/set-html/src/pages/children.astro
@@ -0,0 +1,22 @@
+---
+import Slot from '../../components/Slot.astro';
+---
+
+<html>
+	<body>
+		<h3>Bug: Astro.slots.render() with arguments does not work with &lt;Fragment&gt; slot</h3>
+		<p>Comment out working example and uncomment non working exmaples</p>
+		<hr>
+
+		<Slot>
+			<Fragment slot="name">
+				Test
+			</Fragment>
+		</Slot>
+		<Slot>
+			<!-- <Fragment slot="name">
+				{arg => <p>{arg}</p>}
+			</Fragment> -->
+		</Slot>
+	</body>
+</html>
diff --git a/packages/astro/test/set-html.test.js b/packages/astro/test/set-html.test.js
@@ -35,6 +35,12 @@ describe('set:html', () => {
 			expect($('#fetched-html')).to.have.a.lengthOf(1);
 			expect($('#fetched-html').text()).to.equal('works');
 		});
+		it('test Fragment when Fragment is as a slot', async () => {
+			let res = await fixture.fetch('/children');
+			expect(res.status).to.equal(200);
+			let html = await res.text();
+			expect(html).include('Test');
+		})
 	});
 
 	describe('Build', () => {
@@ -77,5 +83,10 @@ describe('set:html', () => {
 			const $ = cheerio.load(html);
 			expect($('#readable-inner')).to.have.a.lengthOf(1);
 		});
+
+		it('test Fragment when Fragment is as a slot', async () => {
+			let res = await fixture.readFile('/children/index.html');
+			expect(res).include('Test');
+		})
 	});
 });
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml