name : experimentalWarning.js '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;