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2025-04-21 16:03:20 +02:00
commit 2832896157
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'use strict';
module.exports = function (fn, errMsg) {
if (typeof fn !== 'function') {
throw new TypeError('Expected a function');
}
var ret;
var called = false;
var fnName = fn.displayName || fn.name || (/function ([^\(]+)/.exec(fn.toString()) || [])[1];
var onetime = function () {
if (called) {
if (errMsg === true) {
fnName = fnName ? fnName + '()' : 'Function';
throw new Error(fnName + ' can only be called once.');
}
return ret;
}
called = true;
ret = fn.apply(this, arguments);
fn = null;
return ret;
};
onetime.displayName = fnName;
return onetime;
};

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The MIT License (MIT)
Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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{
"_from": "onetime@^1.0.0",
"_id": "onetime@1.1.0",
"_inBundle": false,
"_integrity": "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k=",
"_location": "/onetime",
"_phantomChildren": {},
"_requested": {
"type": "range",
"registry": true,
"raw": "onetime@^1.0.0",
"name": "onetime",
"escapedName": "onetime",
"rawSpec": "^1.0.0",
"saveSpec": null,
"fetchSpec": "^1.0.0"
},
"_requiredBy": [
"/each-async"
],
"_resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
"_shasum": "a1f7838f8314c516f05ecefcbc4ccfe04b4ed789",
"_spec": "onetime@^1.0.0",
"_where": "D:\\developments\\teaser-inertia\\nova-components\\NovaLeader\\node_modules\\each-async",
"author": {
"name": "Sindre Sorhus",
"email": "sindresorhus@gmail.com",
"url": "sindresorhus.com"
},
"bugs": {
"url": "https://github.com/sindresorhus/onetime/issues"
},
"bundleDependencies": false,
"deprecated": false,
"description": "Only call a function once",
"devDependencies": {
"ava": "*",
"xo": "*"
},
"engines": {
"node": ">=0.10.0"
},
"files": [
"index.js"
],
"homepage": "https://github.com/sindresorhus/onetime#readme",
"keywords": [
"once",
"one",
"single",
"call",
"function",
"prevent"
],
"license": "MIT",
"name": "onetime",
"repository": {
"type": "git",
"url": "git+https://github.com/sindresorhus/onetime.git"
},
"scripts": {
"test": "xo && ava"
},
"version": "1.1.0"
}

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# onetime [![Build Status](https://travis-ci.org/sindresorhus/onetime.svg?branch=master)](https://travis-ci.org/sindresorhus/onetime)
> Only call a function once
When called multiple times it will return the return value from the first call.
*Unlike the module [once](https://github.com/isaacs/once), this one isn't naughty extending `Function.prototype`.*
## Install
```
$ npm install --save onetime
```
## Usage
```js
let i = 0;
const foo = onetime(() => i++);
foo(); //=> 0
foo(); //=> 0
foo(); //=> 0
```
## API
### onetime(function, [shouldThrow])
#### function
Type: `function`
Function that should only be called once.
#### shouldThrow
Type: `boolean`
Default: `false`
![](screenshot-shouldthrow.png)
Set to `true` if you want it to fail with a nice and descriptive error when called more than once.
## License
MIT © [Sindre Sorhus](http://sindresorhus.com)