0.2.0 - Mid migration

web/node_modules/is-callable/test/index.js

@@ -0,0 +1,170 @@
+'use strict';
+
+/* globals Proxy */
+/* eslint no-magic-numbers: 1 */
+
+var test = require('tape');
+var isCallable = require('../');
+var hasToStringTag = require('has-tostringtag/shams')();
+var v = require('es-value-fixtures');
+var forEach = require('for-each');
+var inspect = require('object-inspect');
+var typedArrayNames = require('available-typed-arrays')();
+var generators = require('make-generator-function')();
+var arrows = require('make-arrow-function').list();
+var asyncs = require('make-async-function').list();
+var weirdlyCommentedArrowFn;
+try {
+	/* eslint-disable no-new-func */
+	weirdlyCommentedArrowFn = Function('return cl/*/**/=>/**/ass - 1;')();
+	/* eslint-enable no-new-func */
+} catch (e) { /**/ }
+
+var noop = function () {};
+var classFake = function classFake() { }; // eslint-disable-line func-name-matching
+var returnClass = function () { return ' class '; };
+var return3 = function () { return 3; };
+/* for coverage */
+noop();
+classFake();
+returnClass();
+return3();
+/* end for coverage */
+
+var proxy;
+if (typeof Proxy === 'function') {
+	try {
+		proxy = new Proxy(function () {}, {});
+		// for coverage
+		proxy();
+		String(proxy);
+	} catch (_) {
+		// If `Reflect` is supported, then `Function.prototype.toString` isn't used for callability detection.
+		if (typeof Reflect !== 'object') {
+			// Older engines throw a `TypeError` when `Function.prototype.toString` is called on a Proxy object.
+			proxy = null;
+		}
+	}
+}
+
+var invokeFunction = function invokeFunctionString(str) {
+	var result;
+	try {
+		/* eslint-disable no-new-func */
+		var fn = Function(str);
+		/* eslint-enable no-new-func */
+		result = fn();
+	} catch (e) {}
+	return result;
+};
+
+var classConstructor = invokeFunction('"use strict"; return class Foo {}');
+
+var commentedClass = invokeFunction('"use strict"; return class/*kkk*/\n//blah\n Bar\n//blah\n {}');
+var commentedClassOneLine = invokeFunction('"use strict"; return class/**/A{}');
+var classAnonymous = invokeFunction('"use strict"; return class{}');
+var classAnonymousCommentedOneLine = invokeFunction('"use strict"; return class/*/*/{}');
+
+test('not callables', function (t) {
+	t.notOk(isCallable(), 'implicit undefined is not callable');
+
+	forEach(v.nonFunctions.concat([
+		Object(42),
+		Object('foo'),
+		NaN,
+		[],
+		/a/g,
+		new RegExp('a', 'g'),
+		new Date()
+	]), function (nonFunction) {
+		t.equal(isCallable(nonFunction), false, inspect(nonFunction) + ' is not callable');
+	});
+
+	t.test('non-function with function in its [[Prototype]] chain', function (st) {
+		var Foo = function Bar() {};
+		Foo.prototype = noop;
+		st.equal(isCallable(Foo), true, 'sanity check: Foo is callable');
+		st.equal(isCallable(new Foo()), false, 'instance of Foo is not callable');
+		st.end();
+	});
+
+	t.end();
+});
+
+test('@@toStringTag', { skip: !hasToStringTag }, function (t) {
+	var fakeFunction = {
+		toString: function () { return String(return3); },
+		valueOf: return3
+	};
+	fakeFunction[Symbol.toStringTag] = 'Function';
+	t.equal(String(fakeFunction), String(return3));
+	t.equal(Number(fakeFunction), return3());
+	t.notOk(isCallable(fakeFunction), 'fake Function with @@toStringTag "Function" is not callable');
+	t.end();
+});
+
+test('Functions', function (t) {
+	t.ok(isCallable(noop), 'function is callable');
+	t.ok(isCallable(classFake), 'function with name containing "class" is callable');
+	t.ok(isCallable(returnClass), 'function with string " class " is callable');
+	t.ok(isCallable(isCallable), 'isCallable is callable');
+	t.end();
+});
+
+test('Typed Arrays', { skip: typedArrayNames.length === 0 }, function (st) {
+	forEach(typedArrayNames, function (typedArray) {
+		st.ok(isCallable(global[typedArray]), typedArray + ' is callable');
+	});
+	st.end();
+});
+
+test('Generators', { skip: generators.length === 0 }, function (t) {
+	forEach(generators, function (genFn) {
+		t.ok(isCallable(genFn), 'generator function ' + genFn + ' is callable');
+	});
+	t.end();
+});
+
+test('Arrow functions', { skip: arrows.length === 0 }, function (t) {
+	forEach(arrows, function (arrowFn) {
+		t.ok(isCallable(arrowFn), 'arrow function ' + arrowFn + ' is callable');
+	});
+	t.ok(isCallable(weirdlyCommentedArrowFn), 'weirdly commented arrow functions are callable');
+	t.end();
+});
+
+test('"Class" constructors', { skip: !classConstructor || !commentedClass || !commentedClassOneLine || !classAnonymous }, function (t) {
+	t.notOk(isCallable(classConstructor), 'class constructors are not callable');
+	t.notOk(isCallable(commentedClass), 'class constructors with comments in the signature are not callable');
+	t.notOk(isCallable(commentedClassOneLine), 'one-line class constructors with comments in the signature are not callable');
+	t.notOk(isCallable(classAnonymous), 'anonymous class constructors are not callable');
+	t.notOk(isCallable(classAnonymousCommentedOneLine), 'anonymous one-line class constructors with comments in the signature are not callable');
+	t.end();
+});
+
+test('`async function`s', { skip: asyncs.length === 0 }, function (t) {
+	forEach(asyncs, function (asyncFn) {
+		t.ok(isCallable(asyncFn), '`async function` ' + asyncFn + ' is callable');
+	});
+	t.end();
+});
+
+test('proxies of functions', { skip: !proxy }, function (t) {
+	t.ok(isCallable(proxy), 'proxies of functions are callable');
+	t.end();
+});
+
+test('throwing functions', function (t) {
+	t.plan(1);
+
+	var thrower = function (a) { return a.b; };
+	t.ok(isCallable(thrower), 'a function that throws is callable');
+});
+
+/* globals document: false */
+test('document.all', { skip: typeof document !== 'object' }, function (t) {
+	t.notOk(isCallable(document), 'document is not callable');
+	t.ok(isCallable(document.all), 'document.all is callable');
+
+	t.end();
+});