Clean up the oopsie. Rebuild the blank exercises.

node_modules/onetime/index.js

@@ -1,39 +1,44 @@
 'use strict';
 const mimicFn = require('mimic-fn');
 
-module.exports = (fn, opts) => {
-	// TODO: Remove this in v3
-	if (opts === true) {
-		throw new TypeError('The second argument is now an options object');
-	}
+const calledFunctions = new WeakMap();
 
-	if (typeof fn !== 'function') {
+const onetime = (function_, options = {}) => {
+	if (typeof function_ !== 'function') {
 		throw new TypeError('Expected a function');
 	}
 
-	opts = opts || {};
+	let returnValue;
+	let callCount = 0;
+	const functionName = function_.displayName || function_.name || '<anonymous>';
 
-	let ret;
-	let called = false;
-	const fnName = fn.displayName || fn.name || '<anonymous>';
+	const onetime = function (...arguments_) {
+		calledFunctions.set(onetime, ++callCount);
 
-	const onetime = function () {
-		if (called) {
-			if (opts.throw === true) {
-				throw new Error(`Function \`${fnName}\` can only be called once`);
-			}
-
-			return ret;
+		if (callCount === 1) {
+			returnValue = function_.apply(this, arguments_);
+			function_ = null;
+		} else if (options.throw === true) {
+			throw new Error(`Function \`${functionName}\` can only be called once`);
 		}
 
-		called = true;
-		ret = fn.apply(this, arguments);
-		fn = null;
-
-		return ret;
+		return returnValue;
 	};
 
-	mimicFn(onetime, fn);
+	mimicFn(onetime, function_);
+	calledFunctions.set(onetime, callCount);
 
 	return onetime;
 };
+
+module.exports = onetime;
+// TODO: Remove this for the next major release
+module.exports.default = onetime;
+
+module.exports.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_);
+};