import { YError } from '../yerror.js';
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let previouslyVisitedConfigs = [];
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let shim;
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export function applyExtends(config, cwd, mergeExtends, _shim) {
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shim = _shim;
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let defaultConfig = {};
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if (Object.prototype.hasOwnProperty.call(config, 'extends')) {
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if (typeof config.extends !== 'string')
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return defaultConfig;
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const isPath = /\.json|\..*rc$/.test(config.extends);
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let pathToDefault = null;
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if (!isPath) {
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try {
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pathToDefault = require.resolve(config.extends);
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}
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catch (_err) {
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return config;
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}
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}
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else {
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pathToDefault = getPathToDefaultConfig(cwd, config.extends);
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}
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checkForCircularExtends(pathToDefault);
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previouslyVisitedConfigs.push(pathToDefault);
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defaultConfig = isPath
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? JSON.parse(shim.readFileSync(pathToDefault, 'utf8'))
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: require(config.extends);
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delete config.extends;
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defaultConfig = applyExtends(defaultConfig, shim.path.dirname(pathToDefault), mergeExtends, shim);
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}
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previouslyVisitedConfigs = [];
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return mergeExtends
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? mergeDeep(defaultConfig, config)
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: Object.assign({}, defaultConfig, config);
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}
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function checkForCircularExtends(cfgPath) {
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if (previouslyVisitedConfigs.indexOf(cfgPath) > -1) {
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throw new YError(`Circular extended configurations: '${cfgPath}'.`);
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}
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}
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function getPathToDefaultConfig(cwd, pathToExtend) {
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return shim.path.resolve(cwd, pathToExtend);
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}
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function mergeDeep(config1, config2) {
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const target = {};
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function isObject(obj) {
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return obj && typeof obj === 'object' && !Array.isArray(obj);
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}
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Object.assign(target, config1);
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for (const key of Object.keys(config2)) {
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if (isObject(config2[key]) && isObject(target[key])) {
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target[key] = mergeDeep(config1[key], config2[key]);
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}
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else {
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target[key] = config2[key];
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}
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}
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return target;
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}
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