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'use strict';
const mimicFn = require('mimic-fn');
const calledFunctions = new WeakMap();
const oneTime = (fn, options = {}) => {
if (typeof fn !== 'function') {
throw new TypeError('Expected a function');
}
let ret;
let isCalled = false;
let callCount = 0;
const functionName = fn.displayName || fn.name || '<anonymous>';
const onetime = function (...args) {
calledFunctions.set(onetime, ++callCount);
if (isCalled) {
if (options.throw === true) {
throw new Error(`Function \`${functionName}\` can only be called once`);
}
return ret;
}
isCalled = true;
ret = fn.apply(this, args);
fn = null;
return ret;
};
mimicFn(onetime, fn);
calledFunctions.set(onetime, callCount);
return onetime;
};
module.exports = oneTime;
// TODO: Remove this for the next major release
module.exports.default = oneTime;
module.exports.callCount = fn => {
if (!calledFunctions.has(fn)) {
throw new Error(`The given function \`${fn.name}\` is not wrapped by the \`onetime\` package`);
}
return calledFunctions.get(fn);
};
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