Initial system import

node_modules/@seald-io/nedb/lib/customUtils.js

@@ -0,0 +1,26 @@
+/**
+ * Utility functions that need to be reimplemented for each environment.
+ * This is the version for Node.js
+ * @module customUtilsNode
+ * @private
+ */
+const crypto = require('crypto')
+
+/**
+ * Return a random alphanumerical string of length len
+ * There is a very small probability (less than 1/1,000,000) for the length to be less than len
+ * (il the base64 conversion yields too many pluses and slashes) but
+ * that's not an issue here
+ * The probability of a collision is extremely small (need 3*10^12 documents to have one chance in a million of a collision)
+ * See http://en.wikipedia.org/wiki/Birthday_problem
+ * @param {number} len
+ * @return {string}
+ * @alias module:customUtilsNode.uid
+ */
+const uid = len => crypto.randomBytes(Math.ceil(Math.max(8, len * 2)))
+  .toString('base64')
+  .replace(/[+/]/g, '')
+  .slice(0, len)
+
+// Interface
+module.exports.uid = uid