Initial system import

node_modules/abstract-level/lib/common.js

@@ -0,0 +1,17 @@
+'use strict'
+
+exports.getCallback = function (options, callback) {
+  return typeof options === 'function' ? options : callback
+}
+
+exports.getOptions = function (options, def) {
+  if (typeof options === 'object' && options !== null) {
+    return options
+  }
+
+  if (def !== undefined) {
+    return def
+  }
+
+  return {}
+}