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68 lines
1.9 KiB
68 lines
1.9 KiB
'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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