opusdev/vector-similarity-api

1'use strict';2 3var $TypeError = require('es-errors/type');4var inspect = require('object-inspect');5var getSideChannelList = require('side-channel-list');6var getSideChannelMap = require('side-channel-map');7var getSideChannelWeakMap = require('side-channel-weakmap');8 9var makeChannel = getSideChannelWeakMap || getSideChannelMap || getSideChannelList;10 11/** @type {import('.')} */12module.exports = function getSideChannel() {13	/** @typedef {ReturnType<typeof getSideChannel>} Channel */14 15	/** @type {Channel | undefined} */ var $channelData;16 17	/** @type {Channel} */18	var channel = {19		assert: function (key) {20			if (!channel.has(key)) {21				throw new $TypeError('Side channel does not contain ' + inspect(key));22			}23		},24		'delete': function (key) {25			return !!$channelData && $channelData['delete'](key);26		},27		get: function (key) {28			return $channelData && $channelData.get(key);29		},30		has: function (key) {31			return !!$channelData && $channelData.has(key);32		},33		set: function (key, value) {34			if (!$channelData) {35				$channelData = makeChannel();36			}37 38			$channelData.set(key, value);39		}40	};41	// @ts-expect-error TODO: figure out why this is erroring42	return channel;43};44