mergeConfig.js
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'use strict';
var utils = require('../utils');
/**
* Config-specific merge-function which creates a new config-object
* by merging two configuration objects together.
*
* @param {Object} config1
* @param {Object} config2
* @returns {Object} New object resulting from merging config2 to config1
*/
module.exports = function mergeConfig(config1, config2) {
// eslint-disable-next-line no-param-reassign
config2 = config2 || {};
var config = {};
function getMergedValue(target, source) {
if (utils.isPlainObject(target) && utils.isPlainObject(source)) {
return utils.merge(target, source);
} else if (utils.isPlainObject(source)) {
return utils.merge({}, source);
} else if (utils.isArray(source)) {
return source.slice();
}
return source;
}
// eslint-disable-next-line consistent-return
function mergeDeepProperties(prop) {
if (!utils.isUndefined(config2[prop])) {
return getMergedValue(config1[prop], config2[prop]);
} else if (!utils.isUndefined(config1[prop])) {
return getMergedValue(undefined, config1[prop]);
}
}
// eslint-disable-next-line consistent-return
function valueFromConfig2(prop) {
if (!utils.isUndefined(config2[prop])) {
return getMergedValue(undefined, config2[prop]);
}
}
// eslint-disable-next-line consistent-return
function defaultToConfig2(prop) {
if (!utils.isUndefined(config2[prop])) {
return getMergedValue(undefined, config2[prop]);
} else if (!utils.isUndefined(config1[prop])) {
return getMergedValue(undefined, config1[prop]);
}
}
// eslint-disable-next-line consistent-return
function mergeDirectKeys(prop) {
if (prop in config2) {
return getMergedValue(config1[prop], config2[prop]);
} else if (prop in config1) {
return getMergedValue(undefined, config1[prop]);
}
}
var mergeMap = {
'url': valueFromConfig2,
'method': valueFromConfig2,
'data': valueFromConfig2,
'baseURL': defaultToConfig2,
'transformRequest': defaultToConfig2,
'transformResponse': defaultToConfig2,
'paramsSerializer': defaultToConfig2,
'timeout': defaultToConfig2,
'timeoutMessage': defaultToConfig2,
'withCredentials': defaultToConfig2,
'adapter': defaultToConfig2,
'responseType': defaultToConfig2,
'xsrfCookieName': defaultToConfig2,
'xsrfHeaderName': defaultToConfig2,
'onUploadProgress': defaultToConfig2,
'onDownloadProgress': defaultToConfig2,
'decompress': defaultToConfig2,
'maxContentLength': defaultToConfig2,
'maxBodyLength': defaultToConfig2,
'beforeRedirect': defaultToConfig2,
'transport': defaultToConfig2,
'httpAgent': defaultToConfig2,
'httpsAgent': defaultToConfig2,
'cancelToken': defaultToConfig2,
'socketPath': defaultToConfig2,
'responseEncoding': defaultToConfig2,
'validateStatus': mergeDirectKeys
};
utils.forEach(Object.keys(config1).concat(Object.keys(config2)), function computeConfigValue(prop) {
var merge = mergeMap[prop] || mergeDeepProperties;
var configValue = merge(prop);
(utils.isUndefined(configValue) && merge !== mergeDirectKeys) || (config[prop] = configValue);
});
return config;
};