--- /dev/null
+'use strict'
+
+var experimentalWarnings = new Set();
+
+function emitExperimentalWarning(feature) {
+ if (experimentalWarnings.has(feature)) return;
+ var msg = feature + ' is an experimental feature. This feature could ' +
+ 'change at any time';
+ experimentalWarnings.add(feature);
+ process.emitWarning(msg, 'ExperimentalWarning');
+}
+
+function noop() {}
+
+module.exports.emitExperimentalWarning = process.emitWarning
+ ? emitExperimentalWarning
+ : noop;