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'use strict';
/* globals Proxy */
/* eslint no-magic-numbers: 1 */
var test = require('tape');
var isCallable = require('../');
var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol';
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 forEach = require('foreach');
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.test('non-number/string primitives', function (st) {
st.notOk(isCallable(), 'undefined is not callable');
st.notOk(isCallable(null), 'null is not callable');
st.notOk(isCallable(false), 'false is not callable');
st.notOk(isCallable(true), 'true is not callable');
st.end();
});
t.notOk(isCallable([]), 'array is not callable');
t.notOk(isCallable({}), 'object is not callable');
t.notOk(isCallable(/a/g), 'regex literal is not callable');
t.notOk(isCallable(new RegExp('a', 'g')), 'regex object is not callable');
t.notOk(isCallable(new Date()), 'new Date() is not callable');
t.test('numbers', function (st) {
st.notOk(isCallable(42), 'number is not callable');
st.notOk(isCallable(Object(42)), 'number object is not callable');
st.notOk(isCallable(NaN), 'NaN is not callable');
st.notOk(isCallable(Infinity), 'Infinity is not callable');
st.end();
});
t.test('strings', function (st) {
st.notOk(isCallable('foo'), 'string primitive is not callable');
st.notOk(isCallable(Object('foo')), 'string object is not callable');
st.end();
});
t.test('non-function with function in its [[Prototype]] chain', function (st) {
var Foo = function Bar() {};
Foo.prototype = noop;
st.equal(true, isCallable(Foo), 'sanity check: Foo is callable');
st.equal(false, isCallable(new Foo()), 'instance of Foo is not callable');
st.end();
});
t.end();
});
test('@@toStringTag', { skip: !hasSymbols || !Symbol.toStringTag }, 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();
});
var typedArrayNames = [
'Int8Array',
'Uint8Array',
'Uint8ClampedArray',
'Int16Array',
'Uint16Array',
'Int32Array',
'Uint32Array',
'Float32Array',
'Float64Array'
];
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', function (st) {
forEach(typedArrayNames, function (typedArray) {
/* istanbul ignore if : covered in node 0.6 */
if (typeof global[typedArray] === 'undefined') {
st.comment('# SKIP typed array "' + typedArray + '" not supported');
} else {
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();
});
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