vue-hello/node_modules/postcss/lib/warn-once.js

/* eslint-disable no-console */
'use strict'

let printed = {}

module.exports = function warnOnce(message) {
  if (printed[message]) return
  printed[message] = true

  if (typeof console !== 'undefined' && console.warn) {
    console.warn(message)
  }
}