add initial marp implementation with sample content and build configuration

node_modules/@marp-team/marpit/lib/plugin.js

@@ -0,0 +1,47 @@
+"use strict";
+
+/** @module */
+
+/**
+ * Create Marpit plugin.
+ *
+ * Generate Marpit plugin from passed markdown-it plugin. Marpit plugin needs
+ * markdown-it instance with `marpit` member.
+ *
+ * @example
+ * import { marpitPlugin } from '@marp-team/marpit/plugin'
+ *
+ * export default marpitPlugin((md) => {
+ *   // Compatible with markdown-it plugin
+ *   md.renderer.rules.your_rule = (tokens, idx, options, env, self) => {
+ *     // ...
+ *   }
+ *
+ *   // And accessible to Marpit instance as `md.marpit`
+ *   const { marpit } = md
+ *
+ *   marpit.customDirectives.local.yourDirective = (value) => {
+ *     return { yourDirective: value }
+ *   }
+ * })
+ *
+ * @function marpitPlugin
+ * @param {Function} plugin Base plugin for markdown-it.
+ * @returns {Function} Generated Marpit plugin.
+ */
+function marpitPlugin(plugin) {
+  return function (md, ...args) {
+    if (md.marpit) return plugin.call(this, md, ...args);
+    throw new Error('Marpit plugin has detected incompatible markdown-it instance.');
+  };
+}
+Object.defineProperty(marpitPlugin, '__esModule', {
+  value: true
+});
+Object.defineProperty(marpitPlugin, 'default', {
+  value: marpitPlugin
+});
+Object.defineProperty(marpitPlugin, 'marpitPlugin', {
+  value: marpitPlugin
+});
+module.exports = marpitPlugin;