the-forest/client/node_modules/is-map/index.js
2024-09-17 20:35:18 -04:00

48 lines
1.0 KiB
JavaScript

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