algoliasearch/dist/algoliasearch-lite.esm.browser.js

function createBrowserLocalStorageCache(options) {
    const namespaceKey = `algoliasearch-client-js-${options.key}`;
    // eslint-disable-next-line functional/no-let
    let storage;
    const getStorage = () => {
        if (storage === undefined) {
            storage = options.localStorage || window.localStorage;
        }
        return storage;
    };
    const getNamespace = () => {
        return JSON.parse(getStorage().getItem(namespaceKey) || '{}');
    };
    const setNamespace = (namespace) => {
        getStorage().setItem(namespaceKey, JSON.stringify(namespace));
    };
    const removeOutdatedCacheItems = () => {
        const timeToLive = options.timeToLive ? options.timeToLive * 1000 : null;
        const namespace = getNamespace();
        const filteredNamespaceWithoutOldFormattedCacheItems = Object.fromEntries(Object.entries(namespace).filter(([, cacheItem]) => {
            return cacheItem.timestamp !== undefined;
        }));
        setNamespace(filteredNamespaceWithoutOldFormattedCacheItems);
        if (!timeToLive)
            return;
        const filteredNamespaceWithoutExpiredItems = Object.fromEntries(Object.entries(filteredNamespaceWithoutOldFormattedCacheItems).filter(([, cacheItem]) => {
            const currentTimestamp = new Date().getTime();
            const isExpired = cacheItem.timestamp + timeToLive < currentTimestamp;
            return !isExpired;
        }));
        setNamespace(filteredNamespaceWithoutExpiredItems);
    };
    return {
        get(key, defaultValue, events = {
            miss: () => Promise.resolve(),
        }) {
            return Promise.resolve()
                .then(() => {
                removeOutdatedCacheItems();
                const keyAsString = JSON.stringify(key);
                return getNamespace()[keyAsString];
            })
                .then(value => {
                return Promise.all([value ? value.value : defaultValue(), value !== undefined]);
            })
                .then(([value, exists]) => {
                return Promise.all([value, exists || events.miss(value)]);
            })
                .then(([value]) => value);
        },
        set(key, value) {
            return Promise.resolve().then(() => {
                const namespace = getNamespace();
                // eslint-disable-next-line functional/immutable-data
                namespace[JSON.stringify(key)] = {
                    timestamp: new Date().getTime(),
                    value,
                };
                getStorage().setItem(namespaceKey, JSON.stringify(namespace));
                return value;
            });
        },
        delete(key) {
            return Promise.resolve().then(() => {
                const namespace = getNamespace();
                // eslint-disable-next-line functional/immutable-data
                delete namespace[JSON.stringify(key)];
                getStorage().setItem(namespaceKey, JSON.stringify(namespace));
            });
        },
        clear() {
            return Promise.resolve().then(() => {
                getStorage().removeItem(namespaceKey);
            });
        },
    };
}

// @todo Add logger on options to debug when caches go wrong.
function createFallbackableCache(options) {
    const caches = [...options.caches];
    const current = caches.shift(); // eslint-disable-line functional/immutable-data
    if (current === undefined) {
        return createNullCache();
    }
    return {
        get(key, defaultValue, events = {
            miss: () => Promise.resolve(),
        }) {
            return current.get(key, defaultValue, events).catch(() => {
                return createFallbackableCache({ caches }).get(key, defaultValue, events);
            });
        },
        set(key, value) {
            return current.set(key, value).catch(() => {
                return createFallbackableCache({ caches }).set(key, value);
            });
        },
        delete(key) {
            return current.delete(key).catch(() => {
                return createFallbackableCache({ caches }).delete(key);
            });
        },
        clear() {
            return current.clear().catch(() => {
                return createFallbackableCache({ caches }).clear();
            });
        },
    };
}

function createNullCache() {
    return {
        get(_key, defaultValue, events = {
            miss: () => Promise.resolve(),
        }) {
            const value = defaultValue();
            return value
                .then(result => Promise.all([result, events.miss(result)]))
                .then(([result]) => result);
        },
        set(_key, value) {
            return Promise.resolve(value);
        },
        delete(_key) {
            return Promise.resolve();
        },
        clear() {
            return Promise.resolve();
        },
    };
}

function createInMemoryCache(options = { serializable: true }) {
    // eslint-disable-next-line functional/no-let
    let cache = {};
    return {
        get(key, defaultValue, events = {
            miss: () => Promise.resolve(),
        }) {
            const keyAsString = JSON.stringify(key);
            if (keyAsString in cache) {
                return Promise.resolve(options.serializable ? JSON.parse(cache[keyAsString]) : cache[keyAsString]);
            }
            const promise = defaultValue();
            const miss = (events && events.miss) || (() => Promise.resolve());
            return promise.then((value) => miss(value)).then(() => promise);
        },
        set(key, value) {
            // eslint-disable-next-line functional/immutable-data
            cache[JSON.stringify(key)] = options.serializable ? JSON.stringify(value) : value;
            return Promise.resolve(value);
        },
        delete(key) {
            // eslint-disable-next-line functional/immutable-data
            delete cache[JSON.stringify(key)];
            return Promise.resolve();
        },
        clear() {
            cache = {};
            return Promise.resolve();
        },
    };
}

function createAuth(authMode, appId, apiKey) {
    const credentials = {
        'x-algolia-api-key': apiKey,
        'x-algolia-application-id': appId,
    };
    return {
        headers() {
            return authMode === AuthMode.WithinHeaders ? credentials : {};
        },
        queryParameters() {
            return authMode === AuthMode.WithinQueryParameters ? credentials : {};
        },
    };
}

// eslint-disable-next-line functional/prefer-readonly-type
function shuffle(array) {
    let c = array.length - 1; // eslint-disable-line functional/no-let
    // eslint-disable-next-line functional/no-loop-statement
    for (c; c > 0; c--) {
        const b = Math.floor(Math.random() * (c + 1));
        const a = array[c];
        array[c] = array[b]; // eslint-disable-line functional/immutable-data, no-param-reassign
        array[b] = a; // eslint-disable-line functional/immutable-data, no-param-reassign
    }
    return array;
}
function addMethods(base, methods) {
    if (!methods) {
        return base;
    }
    Object.keys(methods).forEach(key => {
        // eslint-disable-next-line functional/immutable-data, no-param-reassign
        base[key] = methods[key](base);
    });
    return base;
}
function encode(format, ...args) {
    // eslint-disable-next-line functional/no-let
    let i = 0;
    return format.replace(/%s/g, () => encodeURIComponent(args[i++]));
}

const version = '4.23.3';

const AuthMode = {
    /**
     * If auth credentials should be in query parameters.
     */
    WithinQueryParameters: 0,
    /**
     * If auth credentials should be in headers.
     */
    WithinHeaders: 1,
};

function createMappedRequestOptions(requestOptions, timeout) {
    const options = requestOptions || {};
    const data = options.data || {};
    Object.keys(options).forEach(key => {
        if (['timeout', 'headers', 'queryParameters', 'data', 'cacheable'].indexOf(key) === -1) {
            data[key] = options[key]; // eslint-disable-line functional/immutable-data
        }
    });
    return {
        data: Object.entries(data).length > 0 ? data : undefined,
        timeout: options.timeout || timeout,
        headers: options.headers || {},
        queryParameters: options.queryParameters || {},
        cacheable: options.cacheable,
    };
}

const CallEnum = {
    /**
     * If the host is read only.
     */
    Read: 1,
    /**
     * If the host is write only.
     */
    Write: 2,
    /**
     * If the host is both read and write.
     */
    Any: 3,
};

const HostStatusEnum = {
    Up: 1,
    Down: 2,
    Timeouted: 3,
};

// By default, API Clients at Algolia have expiration delay
// of 5 mins. In the JavaScript client, we have 2 mins.
const EXPIRATION_DELAY = 2 * 60 * 1000;
function createStatefulHost(host, status = HostStatusEnum.Up) {
    return {
        ...host,
        status,
        lastUpdate: Date.now(),
    };
}
function isStatefulHostUp(host) {
    return host.status === HostStatusEnum.Up || Date.now() - host.lastUpdate > EXPIRATION_DELAY;
}
function isStatefulHostTimeouted(host) {
    return (host.status === HostStatusEnum.Timeouted && Date.now() - host.lastUpdate <= EXPIRATION_DELAY);
}

function createStatelessHost(options) {
    if (typeof options === 'string') {
        return {
            protocol: 'https',
            url: options,
            accept: CallEnum.Any,
        };
    }
    return {
        protocol: options.protocol || 'https',
        url: options.url,
        accept: options.accept || CallEnum.Any,
    };
}

const MethodEnum = {
    Delete: 'DELETE',
    Get: 'GET',
    Post: 'POST',
    Put: 'PUT',
};

function createRetryableOptions(hostsCache, statelessHosts) {
    return Promise.all(statelessHosts.map(statelessHost => {
        return hostsCache.get(statelessHost, () => {
            return Promise.resolve(createStatefulHost(statelessHost));
        });
    })).then(statefulHosts => {
        const hostsUp = statefulHosts.filter(host => isStatefulHostUp(host));
        const hostsTimeouted = statefulHosts.filter(host => isStatefulHostTimeouted(host));
        /**
         * Note, we put the hosts that previously timeouted on the end of the list.
         */
        const hostsAvailable = [...hostsUp, ...hostsTimeouted];
        const statelessHostsAvailable = hostsAvailable.length > 0
            ? hostsAvailable.map(host => createStatelessHost(host))
            : statelessHosts;
        return {
            getTimeout(timeoutsCount, baseTimeout) {
                /**
                 * Imagine that you have 4 hosts, if timeouts will increase
                 * on the following way: 1 (timeouted) > 4 (timeouted) > 5 (200)
                 *
                 * Note that, the very next request, we start from the previous timeout
                 *
                 *  5 (timeouted) > 6 (timeouted) > 7 ...
                 *
                 * This strategy may need to be reviewed, but is the strategy on the our
                 * current v3 version.
                 */
                const timeoutMultiplier = hostsTimeouted.length === 0 && timeoutsCount === 0
                    ? 1
                    : hostsTimeouted.length + 3 + timeoutsCount;
                return timeoutMultiplier * baseTimeout;
            },
            statelessHosts: statelessHostsAvailable,
        };
    });
}

const isNetworkError = ({ isTimedOut, status }) => {
    return !isTimedOut && ~~status === 0;
};
const isRetryable = (response) => {
    const status = response.status;
    const isTimedOut = response.isTimedOut;
    return (isTimedOut || isNetworkError(response) || (~~(status / 100) !== 2 && ~~(status / 100) !== 4));
};
const isSuccess = ({ status }) => {
    return ~~(status / 100) === 2;
};
const retryDecision = (response, outcomes) => {
    if (isRetryable(response)) {
        return outcomes.onRetry(response);
    }
    if (isSuccess(response)) {
        return outcomes.onSuccess(response);
    }
    return outcomes.onFail(response);
};

function retryableRequest(transporter, statelessHosts, request, requestOptions) {
    const stackTrace = []; // eslint-disable-line functional/prefer-readonly-type
    /**
     * First we prepare the payload that do not depend from hosts.
     */
    const data = serializeData(request, requestOptions);
    const headers = serializeHeaders(transporter, requestOptions);
    const method = request.method;
    // On `GET`, the data is proxied to query parameters.
    const dataQueryParameters = request.method !== MethodEnum.Get
        ? {}
        : {
            ...request.data,
            ...requestOptions.data,
        };
    const queryParameters = {
        'x-algolia-agent': transporter.userAgent.value,
        ...transporter.queryParameters,
        ...dataQueryParameters,
        ...requestOptions.queryParameters,
    };
    let timeoutsCount = 0; // eslint-disable-line functional/no-let
    const retry = (hosts, // eslint-disable-line functional/prefer-readonly-type
    getTimeout) => {
        /**
         * We iterate on each host, until there is no host left.
         */
        const host = hosts.pop(); // eslint-disable-line functional/immutable-data
        if (host === undefined) {
            throw createRetryError(stackTraceWithoutCredentials(stackTrace));
        }
        const payload = {
            data,
            headers,
            method,
            url: serializeUrl(host, request.path, queryParameters),
            connectTimeout: getTimeout(timeoutsCount, transporter.timeouts.connect),
            responseTimeout: getTimeout(timeoutsCount, requestOptions.timeout),
        };
        /**
         * The stackFrame is pushed to the stackTrace so we
         * can have information about onRetry and onFailure
         * decisions.
         */
        const pushToStackTrace = (response) => {
            const stackFrame = {
                request: payload,
                response,
                host,
                triesLeft: hosts.length,
            };
            // eslint-disable-next-line functional/immutable-data
            stackTrace.push(stackFrame);
            return stackFrame;
        };
        const decisions = {
            onSuccess: response => deserializeSuccess(response),
            onRetry(response) {
                const stackFrame = pushToStackTrace(response);
                /**
                 * If response is a timeout, we increaset the number of
                 * timeouts so we can increase the timeout later.
                 */
                if (response.isTimedOut) {
                    timeoutsCount++;
                }
                return Promise.all([
                    /**
                     * Failures are individually send the logger, allowing
                     * the end user to debug / store stack frames even
                     * when a retry error does not happen.
                     */
                    transporter.logger.info('Retryable failure', stackFrameWithoutCredentials(stackFrame)),
                    /**
                     * We also store the state of the host in failure cases. If the host, is
                     * down it will remain down for the next 2 minutes. In a timeout situation,
                     * this host will be added end of the list of hosts on the next request.
                     */
                    transporter.hostsCache.set(host, createStatefulHost(host, response.isTimedOut ? HostStatusEnum.Timeouted : HostStatusEnum.Down)),
                ]).then(() => retry(hosts, getTimeout));
            },
            onFail(response) {
                pushToStackTrace(response);
                throw deserializeFailure(response, stackTraceWithoutCredentials(stackTrace));
            },
        };
        return transporter.requester.send(payload).then(response => {
            return retryDecision(response, decisions);
        });
    };
    /**
     * Finally, for each retryable host perform request until we got a non
     * retryable response. Some notes here:
     *
     * 1. The reverse here is applied so we can apply a `pop` later on => more performant.
     * 2. We also get from the retryable options a timeout multiplier that is tailored
     * for the current context.
     */
    return createRetryableOptions(transporter.hostsCache, statelessHosts).then(options => {
        return retry([...options.statelessHosts].reverse(), options.getTimeout);
    });
}

function createTransporter(options) {
    const { hostsCache, logger, requester, requestsCache, responsesCache, timeouts, userAgent, hosts, queryParameters, headers, } = options;
    const transporter = {
        hostsCache,
        logger,
        requester,
        requestsCache,
        responsesCache,
        timeouts,
        userAgent,
        headers,
        queryParameters,
        hosts: hosts.map(host => createStatelessHost(host)),
        read(request, requestOptions) {
            /**
             * First, we compute the user request options. Now, keep in mind,
             * that using request options the user is able to modified the intire
             * payload of the request. Such as headers, query parameters, and others.
             */
            const mappedRequestOptions = createMappedRequestOptions(requestOptions, transporter.timeouts.read);
            const createRetryableRequest = () => {
                /**
                 * Then, we prepare a function factory that contains the construction of
                 * the retryable request. At this point, we may *not* perform the actual
                 * request. But we want to have the function factory ready.
                 */
                return retryableRequest(transporter, transporter.hosts.filter(host => (host.accept & CallEnum.Read) !== 0), request, mappedRequestOptions);
            };
            /**
             * Once we have the function factory ready, we need to determine of the
             * request is "cacheable" - should be cached. Note that, once again,
             * the user can force this option.
             */
            const cacheable = mappedRequestOptions.cacheable !== undefined
                ? mappedRequestOptions.cacheable
                : request.cacheable;
            /**
             * If is not "cacheable", we immediatly trigger the retryable request, no
             * need to check cache implementations.
             */
            if (cacheable !== true) {
                return createRetryableRequest();
            }
            /**
             * If the request is "cacheable", we need to first compute the key to ask
             * the cache implementations if this request is on progress or if the
             * response already exists on the cache.
             */
            const key = {
                request,
                mappedRequestOptions,
                transporter: {
                    queryParameters: transporter.queryParameters,
                    headers: transporter.headers,
                },
            };
            /**
             * With the computed key, we first ask the responses cache
             * implemention if this request was been resolved before.
             */
            return transporter.responsesCache.get(key, () => {
                /**
                 * If the request has never resolved before, we actually ask if there
                 * is a current request with the same key on progress.
                 */
                return transporter.requestsCache.get(key, () => {
                    return (transporter.requestsCache
                        /**
                         * Finally, if there is no request in progress with the same key,
                         * this `createRetryableRequest()` will actually trigger the
                         * retryable request.
                         */
                        .set(key, createRetryableRequest())
                        .then(response => Promise.all([transporter.requestsCache.delete(key), response]), err => Promise.all([transporter.requestsCache.delete(key), Promise.reject(err)]))
                        .then(([_, response]) => response));
                });
            }, {
                /**
                 * Of course, once we get this response back from the server, we
                 * tell response cache to actually store the received response
                 * to be used later.
                 */
                miss: response => transporter.responsesCache.set(key, response),
            });
        },
        write(request, requestOptions) {
            /**
             * On write requests, no cache mechanisms are applied, and we
             * proxy the request immediately to the requester.
             */
            return retryableRequest(transporter, transporter.hosts.filter(host => (host.accept & CallEnum.Write) !== 0), request, createMappedRequestOptions(requestOptions, transporter.timeouts.write));
        },
    };
    return transporter;
}

function createUserAgent(version) {
    const userAgent = {
        value: `Algolia for JavaScript (${version})`,
        add(options) {
            const addedUserAgent = `; ${options.segment}${options.version !== undefined ? ` (${options.version})` : ''}`;
            if (userAgent.value.indexOf(addedUserAgent) === -1) {
                // eslint-disable-next-line functional/immutable-data
                userAgent.value = `${userAgent.value}${addedUserAgent}`;
            }
            return userAgent;
        },
    };
    return userAgent;
}

function deserializeSuccess(response) {
    // eslint-disable-next-line functional/no-try-statement
    try {
        return JSON.parse(response.content);
    }
    catch (e) {
        throw createDeserializationError(e.message, response);
    }
}
function deserializeFailure({ content, status }, stackFrame) {
    // eslint-disable-next-line functional/no-let
    let message = content;
    // eslint-disable-next-line functional/no-try-statement
    try {
        message = JSON.parse(content).message;
    }
    catch (e) {
        // ..
    }
    return createApiError(message, status, stackFrame);
}

function serializeUrl(host, path, queryParameters) {
    const queryParametersAsString = serializeQueryParameters(queryParameters);
    // eslint-disable-next-line functional/no-let
    let url = `${host.protocol}://${host.url}/${path.charAt(0) === '/' ? path.substr(1) : path}`;
    if (queryParametersAsString.length) {
        url += `?${queryParametersAsString}`;
    }
    return url;
}
function serializeQueryParameters(parameters) {
    const isObjectOrArray = (value) => Object.prototype.toString.call(value) === '[object Object]' ||
        Object.prototype.toString.call(value) === '[object Array]';
    return Object.keys(parameters)
        .map(key => encode('%s=%s', key, isObjectOrArray(parameters[key]) ? JSON.stringify(parameters[key]) : parameters[key]))
        .join('&');
}
function serializeData(request, requestOptions) {
    if (request.method === MethodEnum.Get ||
        (request.data === undefined && requestOptions.data === undefined)) {
        return undefined;
    }
    const data = Array.isArray(request.data)
        ? request.data
        : { ...request.data, ...requestOptions.data };
    return JSON.stringify(data);
}
function serializeHeaders(transporter, requestOptions) {
    const headers = {
        ...transporter.headers,
        ...requestOptions.headers,
    };
    const serializedHeaders = {};
    Object.keys(headers).forEach(header => {
        const value = headers[header];
        // @ts-ignore
        // eslint-disable-next-line functional/immutable-data
        serializedHeaders[header.toLowerCase()] = value;
    });
    return serializedHeaders;
}

function stackTraceWithoutCredentials(stackTrace) {
    return stackTrace.map(stackFrame => stackFrameWithoutCredentials(stackFrame));
}
function stackFrameWithoutCredentials(stackFrame) {
    const modifiedHeaders = stackFrame.request.headers['x-algolia-api-key']
        ? { 'x-algolia-api-key': '*****' }
        : {};
    return {
        ...stackFrame,
        request: {
            ...stackFrame.request,
            headers: {
                ...stackFrame.request.headers,
                ...modifiedHeaders,
            },
        },
    };
}

function createApiError(message, status, transporterStackTrace) {
    return {
        name: 'ApiError',
        message,
        status,
        transporterStackTrace,
    };
}

function createDeserializationError(message, response) {
    return {
        name: 'DeserializationError',
        message,
        response,
    };
}

function createRetryError(transporterStackTrace) {
    return {
        name: 'RetryError',
        message: 'Unreachable hosts - your application id may be incorrect. If the error persists, contact support@algolia.com.',
        transporterStackTrace,
    };
}

const createSearchClient = options => {
    const appId = options.appId;
    const auth = createAuth(options.authMode !== undefined ? options.authMode : AuthMode.WithinHeaders, appId, options.apiKey);
    const transporter = createTransporter({
        hosts: [
            { url: `${appId}-dsn.algolia.net`, accept: CallEnum.Read },
            { url: `${appId}.algolia.net`, accept: CallEnum.Write },
        ].concat(shuffle([
            { url: `${appId}-1.algolianet.com` },
            { url: `${appId}-2.algolianet.com` },
            { url: `${appId}-3.algolianet.com` },
        ])),
        ...options,
        headers: {
            ...auth.headers(),
            ...{ 'content-type': 'application/x-www-form-urlencoded' },
            ...options.headers,
        },
        queryParameters: {
            ...auth.queryParameters(),
            ...options.queryParameters,
        },
    });
    const base = {
        transporter,
        appId,
        addAlgoliaAgent(segment, version) {
            transporter.userAgent.add({ segment, version });
        },
        clearCache() {
            return Promise.all([
                transporter.requestsCache.clear(),
                transporter.responsesCache.clear(),
            ]).then(() => undefined);
        },
    };
    return addMethods(base, options.methods);
};

const customRequest = (base) => {
    return (request, requestOptions) => {
        if (request.method === MethodEnum.Get) {
            return base.transporter.read(request, requestOptions);
        }
        return base.transporter.write(request, requestOptions);
    };
};

const initIndex = (base) => {
    return (indexName, options = {}) => {
        const searchIndex = {
            transporter: base.transporter,
            appId: base.appId,
            indexName,
        };
        return addMethods(searchIndex, options.methods);
    };
};

const multipleQueries = (base) => {
    return (queries, requestOptions) => {
        const requests = queries.map(query => {
            return {
                ...query,
                params: serializeQueryParameters(query.params || {}),
            };
        });
        return base.transporter.read({
            method: MethodEnum.Post,
            path: '1/indexes/*/queries',
            data: {
                requests,
            },
            cacheable: true,
        }, requestOptions);
    };
};

const multipleSearchForFacetValues = (base) => {
    return (queries, requestOptions) => {
        return Promise.all(queries.map(query => {
            const { facetName, facetQuery, ...params } = query.params;
            return initIndex(base)(query.indexName, {
                methods: { searchForFacetValues },
            }).searchForFacetValues(facetName, facetQuery, {
                ...requestOptions,
                ...params,
            });
        }));
    };
};

const findAnswers = (base) => {
    return (query, queryLanguages, requestOptions) => {
        return base.transporter.read({
            method: MethodEnum.Post,
            path: encode('1/answers/%s/prediction', base.indexName),
            data: {
                query,
                queryLanguages,
            },
            cacheable: true,
        }, requestOptions);
    };
};

const search = (base) => {
    return (query, requestOptions) => {
        return base.transporter.read({
            method: MethodEnum.Post,
            path: encode('1/indexes/%s/query', base.indexName),
            data: {
                query,
            },
            cacheable: true,
        }, requestOptions);
    };
};

const searchForFacetValues = (base) => {
    return (facetName, facetQuery, requestOptions) => {
        return base.transporter.read({
            method: MethodEnum.Post,
            path: encode('1/indexes/%s/facets/%s/query', base.indexName, facetName),
            data: {
                facetQuery,
            },
            cacheable: true,
        }, requestOptions);
    };
};

const LogLevelEnum = {
    Debug: 1,
    Info: 2,
    Error: 3,
};

/* eslint no-console: 0 */
function createConsoleLogger(logLevel) {
    return {
        debug(message, args) {
            if (LogLevelEnum.Debug >= logLevel) {
                console.debug(message, args);
            }
            return Promise.resolve();
        },
        info(message, args) {
            if (LogLevelEnum.Info >= logLevel) {
                console.info(message, args);
            }
            return Promise.resolve();
        },
        error(message, args) {
            console.error(message, args);
            return Promise.resolve();
        },
    };
}

const getRecommendations = base => {
    return (queries, requestOptions) => {
        const requests = queries.map(query => ({
            ...query,
            // The `threshold` param is required by the endpoint to make it easier
            // to provide a default value later, so we default it in the client
            // so that users don't have to provide a value.
            threshold: query.threshold || 0,
        }));
        return base.transporter.read({
            method: MethodEnum.Post,
            path: '1/indexes/*/recommendations',
            data: {
                requests,
            },
            cacheable: true,
        }, requestOptions);
    };
};

function createBrowserXhrRequester() {
    return {
        send(request) {
            return new Promise((resolve) => {
                const baseRequester = new XMLHttpRequest();
                baseRequester.open(request.method, request.url, true);
                Object.keys(request.headers).forEach(key => baseRequester.setRequestHeader(key, request.headers[key]));
                const createTimeout = (timeout, content) => {
                    return setTimeout(() => {
                        baseRequester.abort();
                        resolve({
                            status: 0,
                            content,
                            isTimedOut: true,
                        });
                    }, timeout * 1000);
                };
                const connectTimeout = createTimeout(request.connectTimeout, 'Connection timeout');
                // eslint-disable-next-line functional/no-let
                let responseTimeout;
                // eslint-disable-next-line functional/immutable-data
                baseRequester.onreadystatechange = () => {
                    if (baseRequester.readyState > baseRequester.OPENED && responseTimeout === undefined) {
                        clearTimeout(connectTimeout);
                        responseTimeout = createTimeout(request.responseTimeout, 'Socket timeout');
                    }
                };
                // eslint-disable-next-line functional/immutable-data
                baseRequester.onerror = () => {
                    // istanbul ignore next
                    if (baseRequester.status === 0) {
                        clearTimeout(connectTimeout);
                        clearTimeout(responseTimeout);
                        resolve({
                            content: baseRequester.responseText || 'Network request failed',
                            status: baseRequester.status,
                            isTimedOut: false,
                        });
                    }
                };
                //  eslint-disable-next-line functional/immutable-data
                baseRequester.onload = () => {
                    clearTimeout(connectTimeout);
                    clearTimeout(responseTimeout);
                    resolve({
                        content: baseRequester.responseText,
                        status: baseRequester.status,
                        isTimedOut: false,
                    });
                };
                baseRequester.send(request.data);
            });
        },
    };
}

function algoliasearch(appId, apiKey, options) {
    const commonOptions = {
        appId,
        apiKey,
        timeouts: {
            connect: 1,
            read: 2,
            write: 30,
        },
        requester: createBrowserXhrRequester(),
        logger: createConsoleLogger(LogLevelEnum.Error),
        responsesCache: createInMemoryCache(),
        requestsCache: createInMemoryCache({ serializable: false }),
        hostsCache: createFallbackableCache({
            caches: [
                createBrowserLocalStorageCache({ key: `${version}-${appId}` }),
                createInMemoryCache(),
            ],
        }),
        userAgent: createUserAgent(version).add({
            segment: 'Browser',
            version: 'lite',
        }),
        authMode: AuthMode.WithinQueryParameters,
    };
    return createSearchClient({
        ...commonOptions,
        ...options,
        methods: {
            search: multipleQueries,
            searchForFacetValues: multipleSearchForFacetValues,
            multipleQueries,
            multipleSearchForFacetValues,
            customRequest,
            initIndex: base => (indexName) => {
                return initIndex(base)(indexName, {
                    methods: { search, searchForFacetValues, findAnswers },
                });
            },
            getRecommendations,
        },
    });
}
// eslint-disable-next-line functional/immutable-data
algoliasearch.version = version;

export default algoliasearch;