buildURL.js
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	'use strict';

	import utils from '../utils.js';
	import AxiosURLSearchParams from '../helpers/AxiosURLSearchParams.js';

	/**
	* It replaces all instances of the characters `:`, `$`, `,`, `+`, `[`, and `]` with their
	* URI encoded counterparts
	*
	* @param {string} val The value to be encoded.
	*
	* @returns {string} The encoded value.
	*/
	function encode(val) {
	return encodeURIComponent(val).
	replace(/%3A/gi, ':').
	replace(/%24/g, '$').
	replace(/%2C/gi, ',').
	replace(/%20/g, '+').
	replace(/%5B/gi, '[').
	replace(/%5D/gi, ']');
	}

	/**
	* Build a URL by appending params to the end
	*
	* @param {string} url The base of the url (e.g., http://www.google.com)
	* @param {object} [params] The params to be appended
	* @param {?object} options
	*
	* @returns {string} The formatted url
	*/
	export default function buildURL(url, params, options) {
	/eslint no-param-reassign:0/
	if (!params) {
	return url;
	}

	const _encode = options && options.encode \|\| encode;

	const serializeFn = options && options.serialize;

	let serializedParams;

	if (serializeFn) {
	serializedParams = serializeFn(params, options);
	} else {
	serializedParams = utils.isURLSearchParams(params) ?
	params.toString() :
	new AxiosURLSearchParams(params, options).toString(_encode);
	}

	if (serializedParams) {
	const hashmarkIndex = url.indexOf("#");

	if (hashmarkIndex !== -1) {
	url = url.slice(0, hashmarkIndex);
	}
	url += (url.indexOf('?') === -1 ? '?' : '&') + serializedParams;
	}

	return url;
	}