internal…

warn-deprecated.js
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			module.exports = warnDeprecated

			var log = require('npmlog')

			var deprecations = {}

			function warnDeprecated (type) {
			return function warn (messages, instance) {
			if (!instance) {
			if (!deprecations[type]) {
			deprecations[type] = {}
			messages.forEach(function (m) { log.warn(type, m) })
			}
			} else {
			if (!deprecations[type]) deprecations[type] = {}

			if (!deprecations[type][instance]) {
			deprecations[type][instance] = true
			messages.forEach(function (m) { log.warn(type, m) })
			}
			}
			}
			}