apply-extends.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.applyExtends = void 0;
const fs = require("fs");
const path = require("path");
const yerror_1 = require("./yerror");
let previouslyVisitedConfigs = [];
function checkForCircularExtends(cfgPath) {
if (previouslyVisitedConfigs.indexOf(cfgPath) > -1) {
throw new yerror_1.YError(`Circular extended configurations: '${cfgPath}'.`);
}
}
function getPathToDefaultConfig(cwd, pathToExtend) {
return path.resolve(cwd, pathToExtend);
}
function mergeDeep(config1, config2) {
const target = {};
function isObject(obj) {
return obj && typeof obj === 'object' && !Array.isArray(obj);
}
Object.assign(target, config1);
for (const key of Object.keys(config2)) {
if (isObject(config2[key]) && isObject(target[key])) {
target[key] = mergeDeep(config1[key], config2[key]);
}
else {
target[key] = config2[key];
}
}
return target;
}
function applyExtends(config, cwd, mergeExtends = false) {
let defaultConfig = {};
if (Object.prototype.hasOwnProperty.call(config, 'extends')) {
if (typeof config.extends !== 'string')
return defaultConfig;
const isPath = /\.json|\..*rc$/.test(config.extends);
let pathToDefault = null;
if (!isPath) {
try {
pathToDefault = require.resolve(config.extends);
}
catch (err) {
// most likely this simply isn't a module.
}
}
else {
pathToDefault = getPathToDefaultConfig(cwd, config.extends);
}
// maybe the module uses key for some other reason,
// err on side of caution.
if (!pathToDefault && !isPath)
return config;
if (!pathToDefault)
throw new yerror_1.YError(`Unable to find extended config '${config.extends}' in '${cwd}'.`);
checkForCircularExtends(pathToDefault);
previouslyVisitedConfigs.push(pathToDefault);
defaultConfig = isPath ? JSON.parse(fs.readFileSync(pathToDefault, 'utf8')) : require(config.extends);
delete config.extends;
defaultConfig = applyExtends(defaultConfig, path.dirname(pathToDefault), mergeExtends);
}
previouslyVisitedConfigs = [];
return mergeExtends ? mergeDeep(defaultConfig, config) : Object.assign({}, defaultConfig, config);
}
exports.applyExtends = applyExtends;