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