add initial marp implementation with sample content and build configuration

node_modules/@marp-team/marpit/lib/helpers/split.js

@@ -0,0 +1,35 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+exports.split = split;
+/** @module */
+/**
+ * Split array into multiple arrays by specified condition.
+ *
+ * @param {Array} arr Target array.
+ * @param {splitCallback} func Callback to split array.
+ * @param {boolean} [keepSplitedValue=false] Keep splited value. The split
+ *     point is before the matched value.
+ * @returns {Array[]} Splited array.
+ */
+function split(arr, func, keepSplitedValue = false) {
+  const ret = [[]];
+  for (const value of arr) {
+    /**
+     * Return true at the split point.
+     *
+     * @callback splitCallback
+     * @param {*} value
+     */
+    if (func(value)) {
+      ret.push(keepSplitedValue ? [value] : []);
+    } else {
+      ret[ret.length - 1].push(value);
+    }
+  }
+  return ret;
+}
+var _default = exports.default = split;