add initial marp implementation with sample content and build configuration

node_modules/@marp-team/marpit/lib/postcss/meta.js

@@ -0,0 +1,37 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.meta = exports.default = void 0;
+var _postcss_plugin = _interopRequireDefault(require("../helpers/postcss_plugin"));
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
+/** @module */
+
+/**
+ * Marpit PostCSS meta plugin.
+ *
+ * Parse CSS comment written in the format of `@key value`.
+ *
+ * @function meta
+ * @param {Object} [opts]
+ * @param {Object} [opts.metaType] An object for defined types for metadata.
+ */
+const meta = exports.meta = (0, _postcss_plugin.default)('marpit-postcss-meta', (opts = {}) => (css, {
+  result
+}) => {
+  const metaType = opts.metaType || {};
+  result.marpitMeta = result.marpitMeta || {};
+  css.walkComments(comment => {
+    comment.text.slice(0).replace(/^[*!\s]*@([\w-]+)\s+(.+)$/gim, (_, metaName, value) => {
+      if (metaType[metaName] === Array) {
+        // Array meta
+        result.marpitMeta[metaName] = [...(result.marpitMeta[metaName] || []), value];
+      } else {
+        // String meta (default)
+        result.marpitMeta[metaName] = value;
+      }
+    });
+  });
+});
+var _default = exports.default = meta;