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+# onetime [![Build Status](https://travis-ci.org/sindresorhus/onetime.svg?branch=master)](https://travis-ci.org/sindresorhus/onetime)
+
+> Ensure a function is only called 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 and extending `Function.prototype`.*
+
+
+## Install
+
+```
+$ npm install onetime
+```
+
+
+## Usage
+
+```js
+const onetime = require('onetime');
+
+let i = 0;
+
+const foo = onetime(() => ++i);
+
+foo(); //=> 0
+foo(); //=> 0
+foo(); //=> 0
+
+onetime.callCount(foo); //=> 3
+```
+
+```js
+const onetime = require('onetime');
+
+const foo = onetime(() => {}, {throw: true});
+
+foo();
+
+foo();
+//=> Error: Function `foo` can only be called once
+```
+
+
+## API
+
+### onetime(fn, [options])
+
+Returns a function that only calls `fn` once.
+
+#### fn
+
+Type: `Function`
+
+Function that should only be called once.
+
+#### options
+
+Type: `Object`
+
+##### throw
+
+Type: `boolean`<br>
+Default: `false`
+
+Throw an error when called more than once.
+
+### onetime.callCount(fn)
+
+Returns a number representing how many times `fn` has been called.
+
+Note: It throws an error if you pass in a function that is not wrapped by `onetime`.
+
+```js
+const foo = onetime(() => {});
+
+foo();
+foo();
+foo();
+
+console.log(onetime.callCount(foo));
+//=> 3
+```
+
+#### fn
+
+Type: `Function`
+
+Function to get call count from.
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)