Astro Integration System (#2820)

* update examples

* add initial integrations

* update tests

* update astro

* update ci

* get final tests working

* update injectelement todo

* update ben code review

* respond to final code review feedback

1 files changed, 35 insertions, 0 deletions

diff --git a/packages/integrations/preact/server.js b/packages/integrations/preact/server.js
new file mode 100644
index 000000000..25b1a1530
--- /dev/null
+++ b/packages/integrations/preact/server.js
@@ -0,0 +1,35 @@
+import { h, Component as BaseComponent } from 'preact';
+import render from 'preact-render-to-string';
+import StaticHtml from './static-html.js';
+
+function check(Component, props, children) {
+	if (typeof Component !== 'function') return false;
+
+	if (Component.prototype != null && typeof Component.prototype.render === 'function') {
+		return BaseComponent.isPrototypeOf(Component);
+	}
+
+	try {
+		const { html } = renderToStaticMarkup(Component, props, children);
+		if (typeof html !== 'string') {
+			return false;
+		}
+
+		// There are edge cases (SolidJS) where Preact *might* render a string,
+		// but components would be <undefined></undefined>
+
+		return !/\<undefined\>/.test(html);
+	} catch (err) {
+		return false;
+	}
+}
+
+function renderToStaticMarkup(Component, props, children) {
+	const html = render(h(Component, props, children != null ? h(StaticHtml, { value: children }) : children));
+	return { html };
+}
+
+export default {
+	check,
+	renderToStaticMarkup,
+};