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;
}