122 lines
3.5 KiB
JavaScript
122 lines
3.5 KiB
JavaScript
'use strict';
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var hasToStringTag = require('has-tostringtag/shams')();
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var forEach = require('for-each');
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var test = require('tape');
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var isRegex = require('..');
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test('not regexes', function (t) {
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// @ts-expect-error
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t.notOk(isRegex(), 'undefined is not regex');
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t.notOk(isRegex(null), 'null is not regex');
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t.notOk(isRegex(false), 'false is not regex');
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t.notOk(isRegex(true), 'true is not regex');
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t.notOk(isRegex(42), 'number is not regex');
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t.notOk(isRegex('foo'), 'string is not regex');
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t.notOk(isRegex([]), 'array is not regex');
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t.notOk(isRegex({}), 'object is not regex');
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t.notOk(isRegex(function () {}), 'function is not regex');
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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 regex = /a/g;
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/** @type {{ toString(): string, valueOf(): RegExp, [Symbol.toStringTag]?: string}} */
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var fakeRegex = {
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toString: function () { return String(regex); },
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valueOf: function () { return regex; }
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};
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fakeRegex[Symbol.toStringTag] = 'RegExp';
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t.notOk(isRegex(fakeRegex), 'fake RegExp with @@toStringTag "RegExp" is not regex');
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t.end();
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});
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test('regexes', function (t) {
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t.ok(isRegex(/a/g), 'regex literal is regex');
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t.ok(isRegex(new RegExp('a', 'g')), 'regex object is regex');
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t.end();
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});
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test('does not mutate regexes', function (t) {
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t.test('lastIndex is a marker object', function (st) {
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var regex = /a/;
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var marker = {};
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// @ts-expect-error
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regex.lastIndex = marker;
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st.equal(regex.lastIndex, marker, 'lastIndex is the marker object');
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st.ok(isRegex(regex), 'is regex');
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st.equal(regex.lastIndex, marker, 'lastIndex is the marker object after isRegex');
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st.end();
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});
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t.test('lastIndex is nonzero', function (st) {
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var regex = /a/;
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regex.lastIndex = 3;
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st.equal(regex.lastIndex, 3, 'lastIndex is 3');
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st.ok(isRegex(regex), 'is regex');
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st.equal(regex.lastIndex, 3, 'lastIndex is 3 after isRegex');
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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('does not perform operations observable to Proxies', { skip: typeof Proxy !== 'function' }, function (t) {
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/** @constructor */
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function Handler() {
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/** @type (keyof Reflect)[]} */
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this.trapCalls = [];
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}
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// eslint-disable-next-line no-extra-parens
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forEach(/** @const @type {(keyof Reflect)[]} */ ([
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'defineProperty',
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'deleteProperty',
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'get',
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'getOwnPropertyDescriptor',
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'getPrototypeOf',
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'has',
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'isExtensible',
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'ownKeys',
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'preventExtensions',
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'set',
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'setPrototypeOf'
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]), function (trapName) {
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Handler.prototype[trapName] = function () {
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this.trapCalls.push(trapName);
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// @ts-expect-error TODO: not sure why this is erroring
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return Reflect[trapName].apply(Reflect, arguments);
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};
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});
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t.test('proxy of object', function (st) {
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var handler = new Handler();
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// @ts-expect-error Proxy handlers can be any object
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var proxy = new Proxy({ lastIndex: 0 }, handler);
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st.equal(isRegex(proxy), false, 'proxy of plain object is not regex');
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st.deepEqual(
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handler.trapCalls,
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handler.trapCalls.length > 0 ? ['getOwnPropertyDescriptor'] : [],
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'no unexpected proxy traps were triggered'
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);
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st.end();
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});
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t.test('proxy of RegExp instance', function (st) {
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var handler = new Handler();
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// @ts-expect-error Proxy handlers can be any object
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var proxy = new Proxy(/a/, handler);
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st.equal(isRegex(proxy), false, 'proxy of RegExp instance is not regex');
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st.deepEqual(
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handler.trapCalls,
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handler.trapCalls.length > 0 ? ['getOwnPropertyDescriptor'] : [],
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'no unexpected proxy traps were triggered'
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);
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st.end();
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});
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t.end();
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});
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