fix

book/node_modules/yargs/build/lib/utils/apply-extends.js

@@ -0,0 +1,59 @@
+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;
+}