Package Exports
- onetime
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (onetime) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
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, this one isn't naughty and extending Function.prototype.
Install
$ npm install onetimeUsage
let i = 0;
const foo = onetime(() => i++);
foo(); //=> 0
foo(); //=> 0
foo(); //=> 0
onetime.callCount(foo); //=> 3const foo = onetime(() => {}, {throw: true});
foo();
foo();
//=> Error: Function `foo` can only be called onceAPI
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
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.
const foo = onetime(() => {});
foo();
foo();
foo();
console.log(onetime.callCount(foo));
//=> 3fn
Type: Function
Function to get call count from.
License
MIT © Sindre Sorhus