48 lines
1.0 KiB
Plaintext
48 lines
1.0 KiB
Plaintext
'use strict';
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/** @const */
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var $Map = typeof Map === 'function' && Map.prototype ? Map : null;
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var $Set = typeof Set === 'function' && Set.prototype ? Set : null;
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var exported;
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if (!$Map) {
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/** @type {import('.')} */
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// eslint-disable-next-line no-unused-vars
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exported = function isMap(x) {
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// `Map` is not present in this environment.
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return false;
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};
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}
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var $mapHas = $Map ? Map.prototype.has : null;
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var $setHas = $Set ? Set.prototype.has : null;
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if (!exported && !$mapHas) {
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/** @type {import('.')} */
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// eslint-disable-next-line no-unused-vars
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exported = function isMap(x) {
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// `Map` does not have a `has` method
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return false;
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};
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}
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/** @type {import('.')} */
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module.exports = exported || function isMap(x) {
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if (!x || typeof x !== 'object') {
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return false;
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}
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try {
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$mapHas.call(x);
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if ($setHas) {
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try {
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$setHas.call(x);
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} catch (e) {
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return true;
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}
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}
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// @ts-expect-error TS can't figure out that $Map is always truthy here
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return x instanceof $Map; // core-js workaround, pre-v2.5.0
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} catch (e) {}
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return false;
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};
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