Initial commit (from f5274cbdce4ae7c9e4b937dcdf95ac70ae436d5f)

node_modules/onetime/index.js

@@ -0,0 +1,50 @@
+'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);
+};