'use strict';
var GetIntrinsic = require('get-intrinsic');
var callBound = require('call-bound');
var inspect = require('object-inspect');
var $TypeError = require('es-errors/type');
var $Map = GetIntrinsic('%Map%', true);
/** @type {<K, V>(thisArg: Map<K, V>, key: K) => V} */
var $mapGet = callBound('Map.prototype.get', true);
/** @type {<K, V>(thisArg: Map<K, V>, key: K, value: V) => void} */
var $mapSet = callBound('Map.prototype.set', true);
/** @type {<K, V>(thisArg: Map<K, V>, key: K) => boolean} */
var $mapHas = callBound('Map.prototype.has', true);
/** @type {<K, V>(thisArg: Map<K, V>, key: K) => boolean} */
var $mapDelete = callBound('Map.prototype.delete', true);
/** @type {<K, V>(thisArg: Map<K, V>) => number} */
var $mapSize = callBound('Map.prototype.size', true);
/** @type {import('.')} */
module.exports = !!$Map && /** @type {Exclude<import('.'), false>} */ function getSideChannelMap() {
/** @typedef {ReturnType<typeof getSideChannelMap>} Channel */
/** @typedef {Parameters<Channel['get']>[0]} K */
/** @typedef {Parameters<Channel['set']>[1]} V */
/** @type {Map<K, V> | undefined} */ var $m;
/** @type {Channel} */
var channel = {
assert: function (key) {
if (!channel.has(key)) {
throw new $TypeError('Side channel does not contain ' + inspect(key));
}
},
'delete': function (key) {
if ($m) {
var result = $mapDelete($m, key);
if ($mapSize($m) === 0) {
$m = void undefined;
}
return result;
}
return false;
},
get: function (key) { // eslint-disable-line consistent-return
if ($m) {
return $mapGet($m, key);
}
},
has: function (key) {
if ($m) {
return $mapHas($m, key);
}
return false;
},
set: function (key, value) {
if (!$m) {
// @ts-expect-error TS can't handle narrowing a variable inside a closure
$m = new $Map();
}
$mapSet($m, key, value);
}
};
// @ts-expect-error TODO: figure out why TS is erroring here
return channel;
};