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244
node_modules/is-callable/test/index.js
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244
node_modules/is-callable/test/index.js
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'use strict';
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/* eslint no-magic-numbers: 1 */
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var test = require('tape');
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var isCallable = require('../');
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var hasToStringTag = require('has-tostringtag/shams')();
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var v = require('es-value-fixtures');
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var forEach = require('for-each');
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var inspect = require('object-inspect');
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var typedArrayNames = require('available-typed-arrays')();
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var generators = require('make-generator-function')();
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var arrows = require('make-arrow-function').list();
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var asyncs = require('make-async-function').list();
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var weirdlyCommentedArrowFn;
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try {
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/* eslint-disable no-new-func */
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weirdlyCommentedArrowFn = Function('return cl/*/**/=>/**/ass - 1;')();
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/* eslint-enable no-new-func */
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} catch (e) { /**/ }
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var isIE68 = !(0 in [undefined]);
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var isFirefox = typeof window !== 'undefined' && ('netscape' in window) && (/ rv:/).test(navigator.userAgent);
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var fnToStringCoerces;
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try {
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Function.prototype.toString.call(v.uncoercibleFnObject);
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fnToStringCoerces = true;
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} catch (e) {
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fnToStringCoerces = false;
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}
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var noop = function () {};
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var classFake = function classFake() { }; // eslint-disable-line func-name-matching
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var returnClass = function () { return ' class '; };
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var return3 = function () { return 3; };
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/* for coverage */
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noop();
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classFake();
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returnClass();
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return3();
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/* end for coverage */
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var proxy;
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if (typeof Proxy === 'function') {
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try {
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proxy = new Proxy(function () {}, {});
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// for coverage
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proxy();
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String(proxy);
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} catch (_) {
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// Older engines throw a `TypeError` when `Function.prototype.toString` is called on a Proxy object.
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proxy = null;
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}
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}
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var invokeFunction = function invokeFunctionString(str) {
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var result;
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try {
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/* eslint-disable no-new-func */
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var fn = Function(str);
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/* eslint-enable no-new-func */
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result = fn();
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} catch (e) {}
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return result;
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};
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var classConstructor = invokeFunction('"use strict"; return class Foo {}');
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var hasDetectableClasses = classConstructor && Function.prototype.toString.call(classConstructor) === 'class Foo {}';
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var commentedClass = invokeFunction('"use strict"; return class/*kkk*/\n//blah\n Bar\n//blah\n {}');
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var commentedClassOneLine = invokeFunction('"use strict"; return class/**/A{}');
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var classAnonymous = invokeFunction('"use strict"; return class{}');
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var classAnonymousCommentedOneLine = invokeFunction('"use strict"; return class/*/*/{}');
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test('not callables', function (t) {
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t.notOk(isCallable(), 'implicit undefined is not callable');
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forEach(v.nonFunctions.concat([
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Object(42),
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Object('foo'),
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NaN,
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[],
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/a/g,
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new RegExp('a', 'g'),
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new Date()
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]), function (nonFunction) {
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if (fnToStringCoerces && nonFunction === v.coercibleFnObject) {
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t.comment('FF 3.6 has a Function toString that coerces its receiver, so this test is skipped');
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return;
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}
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if (nonFunction != null) { // eslint-disable-line eqeqeq
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if (isFirefox) {
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// Firefox 3 throws some kind of *object* here instead of a proper error
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t['throws'](
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function () { Function.prototype.toString.call(nonFunction); },
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inspect(nonFunction) + ' can not be used with Function toString'
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);
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} else {
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t['throws'](
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function () { Function.prototype.toString.call(nonFunction); },
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TypeError,
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inspect(nonFunction) + ' can not be used with Function toString'
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);
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}
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}
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t.equal(isCallable(nonFunction), false, inspect(nonFunction) + ' is not callable');
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});
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t.test('non-function with function in its [[Prototype]] chain', function (st) {
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var Foo = function Bar() {};
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Foo.prototype = noop;
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st.equal(isCallable(Foo), true, 'sanity check: Foo is callable');
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st.equal(isCallable(new Foo()), false, 'instance of Foo is not callable');
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st.end();
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});
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t.end();
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});
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test('@@toStringTag', { skip: !hasToStringTag }, function (t) {
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var fakeFunction = {
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toString: function () { return String(return3); },
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valueOf: return3
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};
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fakeFunction[Symbol.toStringTag] = 'Function';
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t.equal(String(fakeFunction), String(return3));
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t.equal(Number(fakeFunction), return3());
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t.notOk(isCallable(fakeFunction), 'fake Function with @@toStringTag "Function" is not callable');
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t.end();
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});
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test('Functions', function (t) {
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t.ok(isCallable(noop), 'function is callable');
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t.ok(isCallable(classFake), 'function with name containing "class" is callable');
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t.ok(isCallable(returnClass), 'function with string " class " is callable');
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t.ok(isCallable(isCallable), 'isCallable is callable');
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t.end();
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});
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test('Typed Arrays', { skip: typedArrayNames.length === 0 }, function (st) {
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forEach(typedArrayNames, function (typedArray) {
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st.ok(isCallable(global[typedArray]), typedArray + ' is callable');
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});
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st.end();
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});
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test('Generators', { skip: generators.length === 0 }, function (t) {
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forEach(generators, function (genFn) {
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t.ok(isCallable(genFn), 'generator function ' + genFn + ' is callable');
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});
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t.end();
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});
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test('Arrow functions', { skip: arrows.length === 0 }, function (t) {
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forEach(arrows, function (arrowFn) {
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t.ok(isCallable(arrowFn), 'arrow function ' + arrowFn + ' is callable');
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});
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t.ok(isCallable(weirdlyCommentedArrowFn), 'weirdly commented arrow functions are callable');
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t.end();
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});
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test('"Class" constructors', {
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skip: !classConstructor || !commentedClass || !commentedClassOneLine || !classAnonymous, todo: !hasDetectableClasses
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}, function (t) {
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if (!hasDetectableClasses) {
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t.comment('WARNING: This engine does not support detectable classes');
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}
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t.notOk(isCallable(classConstructor), 'class constructors are not callable');
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t.notOk(isCallable(commentedClass), 'class constructors with comments in the signature are not callable');
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t.notOk(isCallable(commentedClassOneLine), 'one-line class constructors with comments in the signature are not callable');
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t.notOk(isCallable(classAnonymous), 'anonymous class constructors are not callable');
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t.notOk(isCallable(classAnonymousCommentedOneLine), 'anonymous one-line class constructors with comments in the signature are not callable');
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t.end();
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});
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test('`async function`s', { skip: asyncs.length === 0 }, function (t) {
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forEach(asyncs, function (asyncFn) {
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t.ok(isCallable(asyncFn), '`async function` ' + asyncFn + ' is callable');
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});
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t.end();
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});
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test('proxies of functions', { skip: !proxy }, function (t) {
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t.equal(isCallable(proxy), true, 'proxies of functions are callable');
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t.end();
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});
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test('throwing functions', function (t) {
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t.plan(1);
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var thrower = function (a) { return a.b; };
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t.ok(isCallable(thrower), 'a function that throws is callable');
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});
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test('DOM', function (t) {
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/* eslint-env browser */
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t.test('document.all', { skip: typeof document !== 'object' }, function (st) {
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st.notOk(isCallable(document), 'document is not callable');
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var all = document.all;
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var isFF3 = !isIE68 && Object.prototype.toString(all) === Object.prototype.toString.call(document.all); // this test is true in IE 6-8 also
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var expected = false;
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if (!isFF3) {
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try {
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expected = document.all('') == null; // eslint-disable-line eqeqeq
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} catch (e) { /**/ }
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}
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st.equal(isCallable(document.all), expected, 'document.all is ' + (isFF3 ? 'not ' : '') + 'callable');
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st.end();
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});
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forEach([
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'HTMLElement',
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'HTMLAnchorElement'
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], function (name) {
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var constructor = global[name];
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t.test(name, { skip: !constructor }, function (st) {
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st.match(typeof constructor, /^(?:function|object)$/, name + ' is a function or object');
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var callable = isCallable(constructor);
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st.equal(typeof callable, 'boolean');
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if (callable) {
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st.doesNotThrow(
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function () { Function.prototype.toString.call(constructor); },
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'anything this library claims is callable should be accepted by Function toString'
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);
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} else {
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st['throws'](
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function () { Function.prototype.toString.call(constructor); },
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TypeError,
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'anything this library claims is not callable should not be accepted by Function toString'
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);
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}
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st.end();
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});
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});
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t.end();
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});
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