Refactor routing in App component to enhance navigation and improve error handling by integrating dynamic routes and updating the NotFound route.

node_modules/gray-matter/lib/stringify.js

@@ -0,0 +1,56 @@
+'use strict';
+
+const typeOf = require('kind-of');
+const getEngine = require('./engine');
+const defaults = require('./defaults');
+
+module.exports = function(file, data, options) {
+  if (data == null && options == null) {
+    switch (typeOf(file)) {
+      case 'object':
+        data = file.data;
+        options = {};
+        break;
+      case 'string':
+        return file;
+      default: {
+        throw new TypeError('expected file to be a string or object');
+      }
+    }
+  }
+
+  const str = file.content;
+  const opts = defaults(options);
+  if (data == null) {
+    if (!opts.data) return file;
+    data = opts.data;
+  }
+
+  const language = file.language || opts.language;
+  const engine = getEngine(language, opts);
+  if (typeof engine.stringify !== 'function') {
+    throw new TypeError('expected "' + language + '.stringify" to be a function');
+  }
+
+  data = Object.assign({}, file.data, data);
+  const open = opts.delimiters[0];
+  const close = opts.delimiters[1];
+  const matter = engine.stringify(data, options).trim();
+  let buf = '';
+
+  if (matter !== '{}') {
+    buf = newline(open) + newline(matter) + newline(close);
+  }
+
+  if (typeof file.excerpt === 'string' && file.excerpt !== '') {
+    if (str.indexOf(file.excerpt.trim()) === -1) {
+      buf += newline(file.excerpt) + newline(close);
+    }
+  }
+
+  return buf + newline(str);
+};
+
+function newline(str) {
+  return str.slice(-1) !== '\n' ? str + '\n' : str;
+}