update packages and add valign

scripts/reveal.js/plugin/math/index.ts

@@ -0,0 +1,31 @@
+import type { RevealPlugin } from 'reveal.js';
+
+// @ts-expect-error The runtime implementation remains in JS during the migration.
+import MathImplementation from './plugin.js';
+
+export interface KaTeXPlugin extends RevealPlugin {
+	id: 'katex';
+}
+
+export interface MathJax2Plugin extends RevealPlugin {
+	id: 'mathjax2';
+}
+
+export interface MathJax3Plugin extends RevealPlugin {
+	id: 'mathjax3';
+}
+
+export interface MathJax4Plugin extends RevealPlugin {
+	id: 'mathjax4';
+}
+
+export interface MathPlugin extends MathJax2Plugin {
+	KaTeX: () => KaTeXPlugin;
+	MathJax2: () => MathJax2Plugin;
+	MathJax3: () => MathJax3Plugin;
+	MathJax4: () => MathJax4Plugin;
+}
+
+const Math = MathImplementation as MathPlugin;
+
+export default Math;