You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
42 lines
1022 B
JavaScript
42 lines
1022 B
JavaScript
3 years ago
|
import mimicFunction from 'mimic-fn';
|
||
|
|
|
||
|
|
const calledFunctions = new WeakMap();
|
||
|
|
|
||
|
|
const onetime = (function_, options = {}) => {
|
||
|
|
if (typeof function_ !== 'function') {
|
||
|
|
throw new TypeError('Expected a function');
|
||
|
|
}
|
||
|
|
|
||
|
|
let returnValue;
|
||
|
|
let callCount = 0;
|
||
|
|
const functionName = function_.displayName || function_.name || '<anonymous>';
|
||
|
|
|
||
|
|
const onetime = function (...arguments_) {
|
||
|
|
calledFunctions.set(onetime, ++callCount);
|
||
|
|
|
||
|
|
if (callCount === 1) {
|
||
|
|
returnValue = function_.apply(this, arguments_);
|
||
|
|
function_ = null;
|
||
|
|
} else if (options.throw === true) {
|
||
|
|
throw new Error(`Function \`${functionName}\` can only be called once`);
|
||
|
|
}
|
||
|
|
|
||
|
|
return returnValue;
|
||
|
|
};
|
||
|
|
|
||
|
|
mimicFunction(onetime, function_);
|
||
|
|
calledFunctions.set(onetime, callCount);
|
||
|
|
|
||
|
|
return onetime;
|
||
|
|
};
|
||
|
|
|
||
|
|
onetime.callCount = function_ => {
|
||
|
|
if (!calledFunctions.has(function_)) {
|
||
|
|
throw new Error(`The given function \`${function_.name}\` is not wrapped by the \`onetime\` package`);
|
||
|
|
}
|
||
|
|
|
||
|
|
return calledFunctions.get(function_);
|
||
|
|
};
|
||
|
|
|
||
|
|
export default onetime;
|