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							- 'use strict';
 
- var utils = require('../utils');
 
- var AxiosError = require('../core/AxiosError');
 
- var envFormData = require('../env/classes/FormData');
 
- function isVisitable(thing) {
 
-   return utils.isPlainObject(thing) || utils.isArray(thing);
 
- }
 
- function removeBrackets(key) {
 
-   return utils.endsWith(key, '[]') ? key.slice(0, -2) : key;
 
- }
 
- function renderKey(path, key, dots) {
 
-   if (!path) return key;
 
-   return path.concat(key).map(function each(token, i) {
 
-     // eslint-disable-next-line no-param-reassign
 
-     token = removeBrackets(token);
 
-     return !dots && i ? '[' + token + ']' : token;
 
-   }).join(dots ? '.' : '');
 
- }
 
- function isFlatArray(arr) {
 
-   return utils.isArray(arr) && !arr.some(isVisitable);
 
- }
 
- var predicates = utils.toFlatObject(utils, {}, null, function filter(prop) {
 
-   return /^is[A-Z]/.test(prop);
 
- });
 
- function isSpecCompliant(thing) {
 
-   return thing && utils.isFunction(thing.append) && thing[Symbol.toStringTag] === 'FormData' && thing[Symbol.iterator];
 
- }
 
- /**
 
-  * Convert a data object to FormData
 
-  * @param {Object} obj
 
-  * @param {?Object} [formData]
 
-  * @param {?Object} [options]
 
-  * @param {Function} [options.visitor]
 
-  * @param {Boolean} [options.metaTokens = true]
 
-  * @param {Boolean} [options.dots = false]
 
-  * @param {?Boolean} [options.indexes = false]
 
-  * @returns {Object}
 
-  **/
 
- function toFormData(obj, formData, options) {
 
-   if (!utils.isObject(obj)) {
 
-     throw new TypeError('target must be an object');
 
-   }
 
-   // eslint-disable-next-line no-param-reassign
 
-   formData = formData || new (envFormData || FormData)();
 
-   // eslint-disable-next-line no-param-reassign
 
-   options = utils.toFlatObject(options, {
 
-     metaTokens: true,
 
-     dots: false,
 
-     indexes: false
 
-   }, false, function defined(option, source) {
 
-     // eslint-disable-next-line no-eq-null,eqeqeq
 
-     return !utils.isUndefined(source[option]);
 
-   });
 
-   var metaTokens = options.metaTokens;
 
-   // eslint-disable-next-line no-use-before-define
 
-   var visitor = options.visitor || defaultVisitor;
 
-   var dots = options.dots;
 
-   var indexes = options.indexes;
 
-   var _Blob = options.Blob || typeof Blob !== 'undefined' && Blob;
 
-   var useBlob = _Blob && isSpecCompliant(formData);
 
-   if (!utils.isFunction(visitor)) {
 
-     throw new TypeError('visitor must be a function');
 
-   }
 
-   function convertValue(value) {
 
-     if (value === null) return '';
 
-     if (utils.isDate(value)) {
 
-       return value.toISOString();
 
-     }
 
-     if (!useBlob && utils.isBlob(value)) {
 
-       throw new AxiosError('Blob is not supported. Use a Buffer instead.');
 
-     }
 
-     if (utils.isArrayBuffer(value) || utils.isTypedArray(value)) {
 
-       return useBlob && typeof Blob === 'function' ? new Blob([value]) : Buffer.from(value);
 
-     }
 
-     return value;
 
-   }
 
-   /**
 
-    *
 
-    * @param {*} value
 
-    * @param {String|Number} key
 
-    * @param {Array<String|Number>} path
 
-    * @this {FormData}
 
-    * @returns {boolean} return true to visit the each prop of the value recursively
 
-    */
 
-   function defaultVisitor(value, key, path) {
 
-     var arr = value;
 
-     if (value && !path && typeof value === 'object') {
 
-       if (utils.endsWith(key, '{}')) {
 
-         // eslint-disable-next-line no-param-reassign
 
-         key = metaTokens ? key : key.slice(0, -2);
 
-         // eslint-disable-next-line no-param-reassign
 
-         value = JSON.stringify(value);
 
-       } else if (
 
-         (utils.isArray(value) && isFlatArray(value)) ||
 
-         (utils.isFileList(value) || utils.endsWith(key, '[]') && (arr = utils.toArray(value))
 
-         )) {
 
-         // eslint-disable-next-line no-param-reassign
 
-         key = removeBrackets(key);
 
-         arr.forEach(function each(el, index) {
 
-           !utils.isUndefined(el) && formData.append(
 
-             // eslint-disable-next-line no-nested-ternary
 
-             indexes === true ? renderKey([key], index, dots) : (indexes === null ? key : key + '[]'),
 
-             convertValue(el)
 
-           );
 
-         });
 
-         return false;
 
-       }
 
-     }
 
-     if (isVisitable(value)) {
 
-       return true;
 
-     }
 
-     formData.append(renderKey(path, key, dots), convertValue(value));
 
-     return false;
 
-   }
 
-   var stack = [];
 
-   var exposedHelpers = Object.assign(predicates, {
 
-     defaultVisitor: defaultVisitor,
 
-     convertValue: convertValue,
 
-     isVisitable: isVisitable
 
-   });
 
-   function build(value, path) {
 
-     if (utils.isUndefined(value)) return;
 
-     if (stack.indexOf(value) !== -1) {
 
-       throw Error('Circular reference detected in ' + path.join('.'));
 
-     }
 
-     stack.push(value);
 
-     utils.forEach(value, function each(el, key) {
 
-       var result = !utils.isUndefined(el) && visitor.call(
 
-         formData, el, utils.isString(key) ? key.trim() : key, path, exposedHelpers
 
-       );
 
-       if (result === true) {
 
-         build(el, path ? path.concat(key) : [key]);
 
-       }
 
-     });
 
-     stack.pop();
 
-   }
 
-   if (!utils.isObject(obj)) {
 
-     throw new TypeError('data must be an object');
 
-   }
 
-   build(obj);
 
-   return formData;
 
- }
 
- module.exports = toFormData;
 
 
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