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Natours/starter/node_modules/unique-slug/lib/index.js

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+'use strict'
+var MurmurHash3 = require('imurmurhash')
+
+module.exports = function (uniq) {
+  if (uniq) {
+    var hash = new MurmurHash3(uniq)
+    return ('00000000' + hash.result().toString(16)).slice(-8)
+  } else {
+    return (Math.random().toString(16) + '0000000').slice(2, 10)
+  }
+}