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Benedikt Meurer
b308e62ad4
Drive-by-fix: Also properly log error messages from the build. Bug: 411328609 Change-Id: I928f2015028b4645ff9e3e6111a4193d8f7eba1b Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6468993 Auto-Submit: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Nikolay Vitkov <nvitkov@chromium.org> Commit-Queue: Benedikt Meurer <bmeurer@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
import onetime from 'onetime';
let index = 0;
const foo = onetime(() => ++index);
foo(); //=> 1
foo(); //=> 1
foo(); //=> 1
onetime.callCount(foo); //=> 3
import onetime from '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
The 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.
import onetime from 'onetime';
const foo = onetime(() => {});
foo();
foo();
foo();
console.log(onetime.callCount(foo));
//=> 3
fn
Type: Function
The function to get call count from.