🚚 ➕ add node-signpdf copy to signing packgage until npm includes fix

packages/signing/node-signpdf/dist/helpers/plainAddPlaceholder/getIndexFromRef.js

@@ -0,0 +1,29 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _SignPdfError = _interopRequireDefault(require("../../SignPdfError"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * @param {object} refTable
+ * @param {string} ref
+ * @returns {number}
+ */
+const getIndexFromRef = (refTable, ref) => {
+  let [index] = ref.split(' ');
+  index = parseInt(index);
+
+  if (!refTable.offsets.has(index)) {
+    throw new _SignPdfError.default(`Failed to locate object "${ref}".`, _SignPdfError.default.TYPE_PARSE);
+  }
+
+  return index;
+};
+
+var _default = getIndexFromRef;
+exports.default = _default;