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Tim van der Lippe
c8f6ffd7c3
Also update the PRESUBMIT linter configuration to make sure it actually runs the linter when updating ESLint. Otherwise, it would not properly do the full linter check. R=jacktfranklin@chromium.org DISABLE_THIRD_PARTY_CHECK=Update ESLint Bug: 1068145 Change-Id: Ibf2de156366dc64c90ee1aced5537d2038e7a268 Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2137384 Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org> Reviewed-by: Jack Franklin <jacktfranklin@chromium.org>
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 onetime
Usage
const onetime = require('onetime');
let i = 0;
const foo = onetime(() => ++i);
foo(); //=> 0
foo(); //=> 0
foo(); //=> 0
onetime.callCount(foo); //=> 3
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
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));
//=> 3
fn
Type: Function
Function to get call count from.
License
MIT © Sindre Sorhus