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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) })
      }
    }
  }
}