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							- 'use strict';
 
- var getSideChannel = require('side-channel');
 
- var utils = require('./utils');
 
- var formats = require('./formats');
 
- var has = Object.prototype.hasOwnProperty;
 
- var arrayPrefixGenerators = {
 
-     brackets: function brackets(prefix) {
 
-         return prefix + '[]';
 
-     },
 
-     comma: 'comma',
 
-     indices: function indices(prefix, key) {
 
-         return prefix + '[' + key + ']';
 
-     },
 
-     repeat: function repeat(prefix) {
 
-         return prefix;
 
-     }
 
- };
 
- var isArray = Array.isArray;
 
- var push = Array.prototype.push;
 
- var pushToArray = function (arr, valueOrArray) {
 
-     push.apply(arr, isArray(valueOrArray) ? valueOrArray : [valueOrArray]);
 
- };
 
- var toISO = Date.prototype.toISOString;
 
- var defaultFormat = formats['default'];
 
- var defaults = {
 
-     addQueryPrefix: false,
 
-     allowDots: false,
 
-     allowEmptyArrays: false,
 
-     arrayFormat: 'indices',
 
-     charset: 'utf-8',
 
-     charsetSentinel: false,
 
-     delimiter: '&',
 
-     encode: true,
 
-     encodeDotInKeys: false,
 
-     encoder: utils.encode,
 
-     encodeValuesOnly: false,
 
-     format: defaultFormat,
 
-     formatter: formats.formatters[defaultFormat],
 
-     // deprecated
 
-     indices: false,
 
-     serializeDate: function serializeDate(date) {
 
-         return toISO.call(date);
 
-     },
 
-     skipNulls: false,
 
-     strictNullHandling: false
 
- };
 
- var isNonNullishPrimitive = function isNonNullishPrimitive(v) {
 
-     return typeof v === 'string'
 
-         || typeof v === 'number'
 
-         || typeof v === 'boolean'
 
-         || typeof v === 'symbol'
 
-         || typeof v === 'bigint';
 
- };
 
- var sentinel = {};
 
- var stringify = function stringify(
 
-     object,
 
-     prefix,
 
-     generateArrayPrefix,
 
-     commaRoundTrip,
 
-     allowEmptyArrays,
 
-     strictNullHandling,
 
-     skipNulls,
 
-     encodeDotInKeys,
 
-     encoder,
 
-     filter,
 
-     sort,
 
-     allowDots,
 
-     serializeDate,
 
-     format,
 
-     formatter,
 
-     encodeValuesOnly,
 
-     charset,
 
-     sideChannel
 
- ) {
 
-     var obj = object;
 
-     var tmpSc = sideChannel;
 
-     var step = 0;
 
-     var findFlag = false;
 
-     while ((tmpSc = tmpSc.get(sentinel)) !== void undefined && !findFlag) {
 
-         // Where object last appeared in the ref tree
 
-         var pos = tmpSc.get(object);
 
-         step += 1;
 
-         if (typeof pos !== 'undefined') {
 
-             if (pos === step) {
 
-                 throw new RangeError('Cyclic object value');
 
-             } else {
 
-                 findFlag = true; // Break while
 
-             }
 
-         }
 
-         if (typeof tmpSc.get(sentinel) === 'undefined') {
 
-             step = 0;
 
-         }
 
-     }
 
-     if (typeof filter === 'function') {
 
-         obj = filter(prefix, obj);
 
-     } else if (obj instanceof Date) {
 
-         obj = serializeDate(obj);
 
-     } else if (generateArrayPrefix === 'comma' && isArray(obj)) {
 
-         obj = utils.maybeMap(obj, function (value) {
 
-             if (value instanceof Date) {
 
-                 return serializeDate(value);
 
-             }
 
-             return value;
 
-         });
 
-     }
 
-     if (obj === null) {
 
-         if (strictNullHandling) {
 
-             return encoder && !encodeValuesOnly ? encoder(prefix, defaults.encoder, charset, 'key', format) : prefix;
 
-         }
 
-         obj = '';
 
-     }
 
-     if (isNonNullishPrimitive(obj) || utils.isBuffer(obj)) {
 
-         if (encoder) {
 
-             var keyValue = encodeValuesOnly ? prefix : encoder(prefix, defaults.encoder, charset, 'key', format);
 
-             return [formatter(keyValue) + '=' + formatter(encoder(obj, defaults.encoder, charset, 'value', format))];
 
-         }
 
-         return [formatter(prefix) + '=' + formatter(String(obj))];
 
-     }
 
-     var values = [];
 
-     if (typeof obj === 'undefined') {
 
-         return values;
 
-     }
 
-     var objKeys;
 
-     if (generateArrayPrefix === 'comma' && isArray(obj)) {
 
-         // we need to join elements in
 
-         if (encodeValuesOnly && encoder) {
 
-             obj = utils.maybeMap(obj, encoder);
 
-         }
 
-         objKeys = [{ value: obj.length > 0 ? obj.join(',') || null : void undefined }];
 
-     } else if (isArray(filter)) {
 
-         objKeys = filter;
 
-     } else {
 
-         var keys = Object.keys(obj);
 
-         objKeys = sort ? keys.sort(sort) : keys;
 
-     }
 
-     var encodedPrefix = encodeDotInKeys ? prefix.replace(/\./g, '%2E') : prefix;
 
-     var adjustedPrefix = commaRoundTrip && isArray(obj) && obj.length === 1 ? encodedPrefix + '[]' : encodedPrefix;
 
-     if (allowEmptyArrays && isArray(obj) && obj.length === 0) {
 
-         return adjustedPrefix + '[]';
 
-     }
 
-     for (var j = 0; j < objKeys.length; ++j) {
 
-         var key = objKeys[j];
 
-         var value = typeof key === 'object' && typeof key.value !== 'undefined' ? key.value : obj[key];
 
-         if (skipNulls && value === null) {
 
-             continue;
 
-         }
 
-         var encodedKey = allowDots && encodeDotInKeys ? key.replace(/\./g, '%2E') : key;
 
-         var keyPrefix = isArray(obj)
 
-             ? typeof generateArrayPrefix === 'function' ? generateArrayPrefix(adjustedPrefix, encodedKey) : adjustedPrefix
 
-             : adjustedPrefix + (allowDots ? '.' + encodedKey : '[' + encodedKey + ']');
 
-         sideChannel.set(object, step);
 
-         var valueSideChannel = getSideChannel();
 
-         valueSideChannel.set(sentinel, sideChannel);
 
-         pushToArray(values, stringify(
 
-             value,
 
-             keyPrefix,
 
-             generateArrayPrefix,
 
-             commaRoundTrip,
 
-             allowEmptyArrays,
 
-             strictNullHandling,
 
-             skipNulls,
 
-             encodeDotInKeys,
 
-             generateArrayPrefix === 'comma' && encodeValuesOnly && isArray(obj) ? null : encoder,
 
-             filter,
 
-             sort,
 
-             allowDots,
 
-             serializeDate,
 
-             format,
 
-             formatter,
 
-             encodeValuesOnly,
 
-             charset,
 
-             valueSideChannel
 
-         ));
 
-     }
 
-     return values;
 
- };
 
- var normalizeStringifyOptions = function normalizeStringifyOptions(opts) {
 
-     if (!opts) {
 
-         return defaults;
 
-     }
 
-     if (typeof opts.allowEmptyArrays !== 'undefined' && typeof opts.allowEmptyArrays !== 'boolean') {
 
-         throw new TypeError('`allowEmptyArrays` option can only be `true` or `false`, when provided');
 
-     }
 
-     if (typeof opts.encodeDotInKeys !== 'undefined' && typeof opts.encodeDotInKeys !== 'boolean') {
 
-         throw new TypeError('`encodeDotInKeys` option can only be `true` or `false`, when provided');
 
-     }
 
-     if (opts.encoder !== null && typeof opts.encoder !== 'undefined' && typeof opts.encoder !== 'function') {
 
-         throw new TypeError('Encoder has to be a function.');
 
-     }
 
-     var charset = opts.charset || defaults.charset;
 
-     if (typeof opts.charset !== 'undefined' && opts.charset !== 'utf-8' && opts.charset !== 'iso-8859-1') {
 
-         throw new TypeError('The charset option must be either utf-8, iso-8859-1, or undefined');
 
-     }
 
-     var format = formats['default'];
 
-     if (typeof opts.format !== 'undefined') {
 
-         if (!has.call(formats.formatters, opts.format)) {
 
-             throw new TypeError('Unknown format option provided.');
 
-         }
 
-         format = opts.format;
 
-     }
 
-     var formatter = formats.formatters[format];
 
-     var filter = defaults.filter;
 
-     if (typeof opts.filter === 'function' || isArray(opts.filter)) {
 
-         filter = opts.filter;
 
-     }
 
-     var arrayFormat;
 
-     if (opts.arrayFormat in arrayPrefixGenerators) {
 
-         arrayFormat = opts.arrayFormat;
 
-     } else if ('indices' in opts) {
 
-         arrayFormat = opts.indices ? 'indices' : 'repeat';
 
-     } else {
 
-         arrayFormat = defaults.arrayFormat;
 
-     }
 
-     if ('commaRoundTrip' in opts && typeof opts.commaRoundTrip !== 'boolean') {
 
-         throw new TypeError('`commaRoundTrip` must be a boolean, or absent');
 
-     }
 
-     var allowDots = typeof opts.allowDots === 'undefined' ? opts.encodeDotInKeys === true ? true : defaults.allowDots : !!opts.allowDots;
 
-     return {
 
-         addQueryPrefix: typeof opts.addQueryPrefix === 'boolean' ? opts.addQueryPrefix : defaults.addQueryPrefix,
 
-         allowDots: allowDots,
 
-         allowEmptyArrays: typeof opts.allowEmptyArrays === 'boolean' ? !!opts.allowEmptyArrays : defaults.allowEmptyArrays,
 
-         arrayFormat: arrayFormat,
 
-         charset: charset,
 
-         charsetSentinel: typeof opts.charsetSentinel === 'boolean' ? opts.charsetSentinel : defaults.charsetSentinel,
 
-         commaRoundTrip: opts.commaRoundTrip,
 
-         delimiter: typeof opts.delimiter === 'undefined' ? defaults.delimiter : opts.delimiter,
 
-         encode: typeof opts.encode === 'boolean' ? opts.encode : defaults.encode,
 
-         encodeDotInKeys: typeof opts.encodeDotInKeys === 'boolean' ? opts.encodeDotInKeys : defaults.encodeDotInKeys,
 
-         encoder: typeof opts.encoder === 'function' ? opts.encoder : defaults.encoder,
 
-         encodeValuesOnly: typeof opts.encodeValuesOnly === 'boolean' ? opts.encodeValuesOnly : defaults.encodeValuesOnly,
 
-         filter: filter,
 
-         format: format,
 
-         formatter: formatter,
 
-         serializeDate: typeof opts.serializeDate === 'function' ? opts.serializeDate : defaults.serializeDate,
 
-         skipNulls: typeof opts.skipNulls === 'boolean' ? opts.skipNulls : defaults.skipNulls,
 
-         sort: typeof opts.sort === 'function' ? opts.sort : null,
 
-         strictNullHandling: typeof opts.strictNullHandling === 'boolean' ? opts.strictNullHandling : defaults.strictNullHandling
 
-     };
 
- };
 
- module.exports = function (object, opts) {
 
-     var obj = object;
 
-     var options = normalizeStringifyOptions(opts);
 
-     var objKeys;
 
-     var filter;
 
-     if (typeof options.filter === 'function') {
 
-         filter = options.filter;
 
-         obj = filter('', obj);
 
-     } else if (isArray(options.filter)) {
 
-         filter = options.filter;
 
-         objKeys = filter;
 
-     }
 
-     var keys = [];
 
-     if (typeof obj !== 'object' || obj === null) {
 
-         return '';
 
-     }
 
-     var generateArrayPrefix = arrayPrefixGenerators[options.arrayFormat];
 
-     var commaRoundTrip = generateArrayPrefix === 'comma' && options.commaRoundTrip;
 
-     if (!objKeys) {
 
-         objKeys = Object.keys(obj);
 
-     }
 
-     if (options.sort) {
 
-         objKeys.sort(options.sort);
 
-     }
 
-     var sideChannel = getSideChannel();
 
-     for (var i = 0; i < objKeys.length; ++i) {
 
-         var key = objKeys[i];
 
-         if (options.skipNulls && obj[key] === null) {
 
-             continue;
 
-         }
 
-         pushToArray(keys, stringify(
 
-             obj[key],
 
-             key,
 
-             generateArrayPrefix,
 
-             commaRoundTrip,
 
-             options.allowEmptyArrays,
 
-             options.strictNullHandling,
 
-             options.skipNulls,
 
-             options.encodeDotInKeys,
 
-             options.encode ? options.encoder : null,
 
-             options.filter,
 
-             options.sort,
 
-             options.allowDots,
 
-             options.serializeDate,
 
-             options.format,
 
-             options.formatter,
 
-             options.encodeValuesOnly,
 
-             options.charset,
 
-             sideChannel
 
-         ));
 
-     }
 
-     var joined = keys.join(options.delimiter);
 
-     var prefix = options.addQueryPrefix === true ? '?' : '';
 
-     if (options.charsetSentinel) {
 
-         if (options.charset === 'iso-8859-1') {
 
-             // encodeURIComponent('✓'), the "numeric entity" representation of a checkmark
 
-             prefix += 'utf8=%26%2310003%3B&';
 
-         } else {
 
-             // encodeURIComponent('✓')
 
-             prefix += 'utf8=%E2%9C%93&';
 
-         }
 
-     }
 
-     return joined.length > 0 ? prefix + joined : '';
 
- };
 
 
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