update

node_modules/gray-matter/lib/engines.js

@@ -0,0 +1,54 @@
+'use strict';
+
+const yaml = require('js-yaml');
+
+/**
+ * Default engines
+ */
+
+const engines = exports = module.exports;
+
+/**
+ * YAML
+ */
+
+engines.yaml = {
+  parse: yaml.safeLoad.bind(yaml),
+  stringify: yaml.safeDump.bind(yaml)
+};
+
+/**
+ * JSON
+ */
+
+engines.json = {
+  parse: JSON.parse.bind(JSON),
+  stringify: function(obj, options) {
+    const opts = Object.assign({replacer: null, space: 2}, options);
+    return JSON.stringify(obj, opts.replacer, opts.space);
+  }
+};
+
+/**
+ * JavaScript
+ */
+
+engines.javascript = {
+  parse: function parse(str, options, wrap) {
+    /* eslint no-eval: 0 */
+    try {
+      if (wrap !== false) {
+        str = '(function() {\nreturn ' + str.trim() + ';\n}());';
+      }
+      return eval(str) || {};
+    } catch (err) {
+      if (wrap !== false && /(unexpected|identifier)/i.test(err.message)) {
+        return parse(str, options, false);
+      }
+      throw new SyntaxError(err);
+    }
+  },
+  stringify: function() {
+    throw new Error('stringifying JavaScript is not supported');
+  }
+};