source: imaps-frontend/node_modules/is-regex/test/index.js@ 79a0317

'use strict';

var hasToStringTag = require('has-tostringtag/shams')();
var forEach = require('for-each');
var test = require('tape');
var isRegex = require('..');

test('not regexes', function (t) {
        // @ts-expect-error
        t.notOk(isRegex(), 'undefined is not regex');
        t.notOk(isRegex(null), 'null is not regex');
        t.notOk(isRegex(false), 'false is not regex');
        t.notOk(isRegex(true), 'true is not regex');
        t.notOk(isRegex(42), 'number is not regex');
        t.notOk(isRegex('foo'), 'string is not regex');
        t.notOk(isRegex([]), 'array is not regex');
        t.notOk(isRegex({}), 'object is not regex');
        t.notOk(isRegex(function () {}), 'function is not regex');
        t.end();
});

test('@@toStringTag', { skip: !hasToStringTag }, function (t) {
        var regex = /a/g;
        /** @type {{ toString(): string, valueOf(): RegExp, [Symbol.toStringTag]?: string}} */
        var fakeRegex = {
                toString: function () { return String(regex); },
                valueOf: function () { return regex; }
        };
        fakeRegex[Symbol.toStringTag] = 'RegExp';
        t.notOk(isRegex(fakeRegex), 'fake RegExp with @@toStringTag "RegExp" is not regex');
        t.end();
});

test('regexes', function (t) {
        t.ok(isRegex(/a/g), 'regex literal is regex');
        t.ok(isRegex(new RegExp('a', 'g')), 'regex object is regex');
        t.end();
});

test('does not mutate regexes', function (t) {
        t.test('lastIndex is a marker object', function (st) {
                var regex = /a/;
                var marker = {};
                // @ts-expect-error
                regex.lastIndex = marker;
                st.equal(regex.lastIndex, marker, 'lastIndex is the marker object');
                st.ok(isRegex(regex), 'is regex');
                st.equal(regex.lastIndex, marker, 'lastIndex is the marker object after isRegex');
                st.end();
        });

        t.test('lastIndex is nonzero', function (st) {
                var regex = /a/;
                regex.lastIndex = 3;
                st.equal(regex.lastIndex, 3, 'lastIndex is 3');
                st.ok(isRegex(regex), 'is regex');
                st.equal(regex.lastIndex, 3, 'lastIndex is 3 after isRegex');
                st.end();
        });

        t.end();
});

test('does not perform operations observable to Proxies', { skip: typeof Proxy !== 'function' }, function (t) {
        /** @constructor */
        function Handler() {
                /** @type (keyof Reflect)[]} */
                this.trapCalls = [];
        }

        // eslint-disable-next-line no-extra-parens
        forEach(/** @const @type {(keyof Reflect)[]} */ ([
                'defineProperty',
                'deleteProperty',
                'get',
                'getOwnPropertyDescriptor',
                'getPrototypeOf',
                'has',
                'isExtensible',
                'ownKeys',
                'preventExtensions',
                'set',
                'setPrototypeOf'
        ]), function (trapName) {
                Handler.prototype[trapName] = function () {
                        this.trapCalls.push(trapName);
                        // @ts-expect-error TODO: not sure why this is erroring
                        return Reflect[trapName].apply(Reflect, arguments);
                };
        });

        t.test('proxy of object', function (st) {
                var handler = new Handler();
                // @ts-expect-error Proxy handlers can be any object
                var proxy = new Proxy({ lastIndex: 0 }, handler);

                st.equal(isRegex(proxy), false, 'proxy of plain object is not regex');
                st.deepEqual(
                        handler.trapCalls,
                        handler.trapCalls.length > 0 ? ['getOwnPropertyDescriptor'] : [],
                        'no unexpected proxy traps were triggered'
                );
                st.end();
        });

        t.test('proxy of RegExp instance', function (st) {
                var handler = new Handler();
                // @ts-expect-error Proxy handlers can be any object
                var proxy = new Proxy(/a/, handler);

                st.equal(isRegex(proxy), false, 'proxy of RegExp instance is not regex');
                st.deepEqual(
                        handler.trapCalls,
                        handler.trapCalls.length > 0 ? ['getOwnPropertyDescriptor'] : [],
                        'no unexpected proxy traps were triggered'
                );
                st.end();
        });

        t.end();
});