70 lines
2.2 KiB
JavaScript
70 lines
2.2 KiB
JavaScript
'use strict';
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var callBound = require('call-bound');
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var hasToStringTag = require('has-tostringtag/shams')();
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var hasOwn = require('hasown');
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var gOPD = require('gopd');
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/** @type {import('.')} */
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var fn;
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if (hasToStringTag) {
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/** @type {(receiver: ThisParameterType<typeof RegExp.prototype.exec>, ...args: Parameters<typeof RegExp.prototype.exec>) => ReturnType<typeof RegExp.prototype.exec>} */
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var $exec = callBound('RegExp.prototype.exec');
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/** @type {object} */
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var isRegexMarker = {};
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var throwRegexMarker = function () {
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throw isRegexMarker;
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};
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/** @type {{ toString(): never, valueOf(): never, [Symbol.toPrimitive]?(): never }} */
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var badStringifier = {
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toString: throwRegexMarker,
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valueOf: throwRegexMarker
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};
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if (typeof Symbol.toPrimitive === 'symbol') {
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badStringifier[Symbol.toPrimitive] = throwRegexMarker;
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}
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/** @type {import('.')} */
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// @ts-expect-error TS can't figure out that the $exec call always throws
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// eslint-disable-next-line consistent-return
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fn = function isRegex(value) {
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if (!value || typeof value !== 'object') {
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return false;
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}
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// eslint-disable-next-line no-extra-parens
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var descriptor = /** @type {NonNullable<typeof gOPD>} */ (gOPD)(/** @type {{ lastIndex?: unknown }} */ (value), 'lastIndex');
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var hasLastIndexDataProperty = descriptor && hasOwn(descriptor, 'value');
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if (!hasLastIndexDataProperty) {
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return false;
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}
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try {
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// eslint-disable-next-line no-extra-parens
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$exec(value, /** @type {string} */ (/** @type {unknown} */ (badStringifier)));
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} catch (e) {
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return e === isRegexMarker;
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}
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};
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} else {
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/** @type {(receiver: ThisParameterType<typeof Object.prototype.toString>, ...args: Parameters<typeof Object.prototype.toString>) => ReturnType<typeof Object.prototype.toString>} */
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var $toString = callBound('Object.prototype.toString');
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/** @const @type {'[object RegExp]'} */
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var regexClass = '[object RegExp]';
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/** @type {import('.')} */
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fn = function isRegex(value) {
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// In older browsers, typeof regex incorrectly returns 'function'
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if (!value || (typeof value !== 'object' && typeof value !== 'function')) {
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return false;
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}
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return $toString(value) === regexClass;
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};
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}
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module.exports = fn;
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