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[EDIT] FILE: once.zip

PK������[T[ҐZ�>��>����package.jsonnu�ȯ����������{
  "name": "once",
  "version": "1.4.0",
  "description": "Run a function exactly one time",
  "main": "once.js",
  "directories": {
    "test": "test"
  },
  "dependencies": {
    "wrappy": "1"
  },
  "devDependencies": {
    "tap": "^7.0.1"
  },
  "scripts": {
    "test": "tap test/*.js"
  },
  "files": [
    "once.js"
  ],
  "repository": {
    "type": "git",
    "url": "git://github.com/isaacs/once"
  },
  "keywords": [
    "once",
    "function",
    "one",
    "single"
  ],
  "author": "Isaac Z. Schlueter <i@izs.me> (http://blog.izs.me/)",
  "license": "ISC"
}
PK������[T[��P���������dist/index.js.mapnu�ȯ����������{"version":3,"file":"index.js","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":";AAEA,SAAS,IAAI,KAAI,CAAC;AAElB,SAAS,IAAI,CACZ,OAAqB,EACrB,IAAY;IAEZ,MAAM,CAAC,GAAG,IAAI,CAAC,MAAM,CAAM,OAAO,EAAE,IAAI,CAAC,CAAC;IAC1C,MAAM,CAAC,GAAG,CAAC,CAAC,IAAI,CAAC,CAAC,IAAS,EAAE,EAAE,CAAC,IAAI,CAAC,CAAC,CAAC,CAA8B,CAAC;IACtE,CAAC,CAAC,MAAM,GAAG,CAAC,CAAC,MAAM,CAAC;IACpB,OAAO,CAAC,CAAC;AACV,CAAC;AAED,WAAU,IAAI;IAWb,SAAgB,MAAM,CACrB,OAAqB,EACrB,IAAY;QAEZ,IAAI,CAAC,GAA+B,IAAI,CAAC;QACzC,MAAM,CAAC,GAAG,IAAI,OAAO,CAAI,CAAC,OAAO,EAAE,MAAM,EAAE,EAAE;YAC5C,SAAS,MAAM;gBACd,OAAO,CAAC,cAAc,CAAC,IAAI,EAAE,OAAO,CAAC,CAAC;gBACtC,OAAO,CAAC,cAAc,CAAC,OAAO,EAAE,OAAO,CAAC,CAAC;gBACzC,CAAC,CAAC,MAAM,GAAG,IAAI,CAAC;YACjB,CAAC;YACD,SAAS,OAAO,CAAC,GAAG,IAAW;gBAC9B,MAAM,EAAE,CAAC;gBACT,OAAO,CAAC,IAAS,CAAC,CAAC;YACpB,CAAC;YACD,SAAS,OAAO,CAAC,GAAU;gBAC1B,MAAM,EAAE,CAAC;gBACT,MAAM,CAAC,GAAG,CAAC,CAAC;YACb,CAAC;YACD,CAAC,GAAG,MAAM,CAAC;YACX,OAAO,CAAC,EAAE,CAAC,IAAI,EAAE,OAAO,CAAC,CAAC;YAC1B,OAAO,CAAC,EAAE,CAAC,OAAO,EAAE,OAAO,CAAC,CAAC;QAC9B,CAAC,CAA8B,CAAC;QAChC,IAAI,CAAC,CAAC,EAAE;YACP,MAAM,IAAI,SAAS,CAAC,mCAAmC,CAAC,CAAC;SACzD;QACD,CAAC,CAAC,MAAM,GAAG,CAAC,CAAC;QACb,OAAO,CAAC,CAAC;IACV,CAAC;IA5Be,WAAM,SA4BrB,CAAA;AACF,CAAC,EAxCS,IAAI,KAAJ,IAAI,QAwCb;AAED,iBAAS,IAAI,CAAC"}PK������[T[V����������dist/index.d.tsnu�ȯ����������/// <reference types="node" />
import { EventEmitter } from 'events';
declare function once<T>(emitter: EventEmitter, name: string): once.CancelablePromise<T>;
declare namespace once {
    interface CancelFunction {
        (): void;
    }
    interface CancelablePromise<T> extends Promise<T> {
        cancel: CancelFunction;
    }
    type CancellablePromise<T> = CancelablePromise<T>;
    function spread<T extends any[]>(emitter: EventEmitter, name: string): once.CancelablePromise<T>;
}
export = once;
PK������[T[�B��H��H��
��dist/index.jsnu�ȯ����������"use strict";
function noop() { }
function once(emitter, name) {
    const o = once.spread(emitter, name);
    const r = o.then((args) => args[0]);
    r.cancel = o.cancel;
    return r;
}
(function (once) {
    function spread(emitter, name) {
        let c = null;
        const p = new Promise((resolve, reject) => {
            function cancel() {
                emitter.removeListener(name, onEvent);
                emitter.removeListener('error', onError);
                p.cancel = noop;
            }
            function onEvent(...args) {
                cancel();
                resolve(args);
            }
            function onError(err) {
                cancel();
                reject(err);
            }
            c = cancel;
            emitter.on(name, onEvent);
            emitter.on('error', onError);
        });
        if (!c) {
            throw new TypeError('Could not get `cancel()` function');
        }
        p.cancel = c;
        return p;
    }
    once.spread = spread;
})(once || (once = {}));
module.exports = once;
//# sourceMappingURL=index.js.mapPK������<V[ �(�������	��README.mdnu�ȯ����������# once

Only call a function once.

## usage

```javascript
var once = require('once')

function load (file, cb) {
  cb = once(cb)
  loader.load('file')
  loader.once('load', cb)
  loader.once('error', cb)
}
```

Or add to the Function.prototype in a responsible way:

```javascript
// only has to be done once
require('once').proto()

function load (file, cb) {
  cb = cb.once()
  loader.load('file')
  loader.once('load', cb)
  loader.once('error', cb)
}
```

Ironically, the prototype feature makes this module twice as
complicated as necessary.

To check whether you function has been called, use `fn.called`. Once the
function is called for the first time the return value of the original
function is saved in `fn.value` and subsequent calls will continue to
return this value.

```javascript
var once = require('once')

function load (cb) {
  cb = once(cb)
  var stream = createStream()
  stream.once('data', cb)
  stream.once('end', function () {
    if (!cb.called) cb(new Error('not found'))
  })
}
```

## `once.strict(func)`

Throw an error if the function is called twice.

Some functions are expected to be called only once. Using `once` for them would
potentially hide logical errors.

In the example below, the `greet` function has to call the callback only once:

```javascript
function greet (name, cb) {
  // return is missing from the if statement
  // when no name is passed, the callback is called twice
  if (!name) cb('Hello anonymous')
  cb('Hello ' + name)
}

function log (msg) {
  console.log(msg)
}

// this will print 'Hello anonymous' but the logical error will be missed
greet(null, once(msg))

// once.strict will print 'Hello anonymous' and throw an error when the callback will be called the second time
greet(null, once.strict(msg))
```
PK������<V[�aGW��������LICENSEnu�ȯ����������The ISC License

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
PK������<V[�#�,��������once.jsnu�ȯ����������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
}
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