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Name	Size	Perms	Modified	Actions
[ .. / .. ]
LICENSE	765 B	-rw-r--r--	2025-07-03 08:10:11	Edit Del
README.md	1.73 KB	-rw-r--r--	2025-07-03 08:10:10	Edit Del
once.js	935 B	-rw-r--r--	2025-07-03 08:10:11	Edit Del
package.json	574 B	-rw-r--r--	2025-07-03 08:10:10	Edit Del

Editing: once.js (935 B)

var wrappy = require('wrappy')
module.exports = wrappy(once)
module.exports.strict = wrappy(onceStrict)

once.proto = once(function () {
  Object.defineProperty(Function.prototype, 'once', {
    value: function () {
      return once(this)
    },
    configurable: true
  })

  Object.defineProperty(Function.prototype, 'onceStrict', {
    value: function () {
      return onceStrict(this)
    },
    configurable: true
  })
})

function once (fn) {
  var f = function () {
    if (f.called) return f.value
    f.called = true
    return f.value = fn.apply(this, arguments)
  }
  f.called = false
  return f
}

function onceStrict (fn) {
  var f = function () {
    if (f.called)
      throw new Error(f.onceError)
    f.called = true
    return f.value = fn.apply(this, arguments)
  }
  var name = fn.name || 'Function wrapped with `once`'
  f.onceError = name + " shouldn't be called more than once"
  f.called = false
  return f
}