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