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const path = require('path');
const isPlainObj = require('is-plain-obj');
const merge = require('merge-options').bind({ concatArrays: true });
const load = require('./load');
const resolve = require('./resolve');
const pluginFilters = require('./filters/plugins');
const ruleFilters = require('./filters/rules');
const loadExtends = (extent, options) => {
let result;
/* istanbul ignore else */
if (path.isAbsolute(extent)) {
result = load({ allowMissing: true, configPath: extent });
} else {
// eslint-disable-next-line import/no-dynamic-require, global-require
result = { config: require(extent), configPath: extent };
}
// eslint-disable-next-line no-use-before-define
return resolve(result).then(({ config }) => mergeExtend(config, options));
};
const filterPlugins = (config, options = {}) => {
const filterName = options.plugins || 'default';
const filter = pluginFilters[filterName] || pluginFilters.default;
return filter(config);
};
const filterRules = (config, options = {}) => {
const filterName = options.rules || 'default';
const filter = ruleFilters[filterName] || ruleFilters.default;
return filter(config);
};
const filterModule = (config, options = {}) => {
const { module } = config;
/* istanbul ignore else */
if (module) {
module.rules = filterRules(config, options);
}
return module;
};
const filter = (config, options = {}) => {
/* eslint-disable no-param-reassign */
config.module = filterModule(config, options);
config.plugins = filterPlugins(config, options);
return config;
};
const mergeExtend = (config, options = {}) => {
let { extends: configExtends } = config;
if (configExtends) {
if (isPlainObj(configExtends)) {
// eslint-disable-next-line no-param-reassign
options = configExtends.filters;
configExtends = configExtends.configs;
}
configExtends = [].concat(configExtends);
const result = configExtends.reduceRight(
(prev, conf) =>
loadExtends(conf, options).then((extent) =>
prev.then((prevConfig) => filter(merge(extent, prevConfig), options))
),
Promise.resolve(config)
);
return result;
}
return Promise.resolve(config);
};
module.exports = {
extend(config, options) {
const promises = [].concat(config).map((conf) =>
mergeExtend(conf, options).then((result) => {
delete result.extends;
return result;
})
);
return Promise.all(promises).then(
(results) => (results.length > 1 ? results : results[0])
);
},
};
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