1 files changed, 52 insertions, 0 deletions
diff --git a/node_modules/@iarna/cli/node_modules/yargs/lib/apply-extends.js b/node_modules/@iarna/cli/node_modules/yargs/lib/apply-extends.js
new file mode 100644
index 000000000..5fc69fab1
--- /dev/null
+++ b/node_modules/@iarna/cli/node_modules/yargs/lib/apply-extends.js
@@ -0,0 +1,52 @@
+var fs = require('fs')
+var path = require('path')
+var assign = require('./assign')
+var YError = require('./yerror')
+
+var previouslyVisitedConfigs = []
+
+function checkForCircularExtends (path) {
+  if (previouslyVisitedConfigs.indexOf(path) > -1) {
+    throw new YError("Circular extended configurations: '" + path + "'.")
+  }
+}
+
+function getPathToDefaultConfig (cwd, pathToExtend) {
+  return path.resolve(cwd, pathToExtend)
+}
+
+function applyExtends (config, cwd) {
+  var defaultConfig = {}
+
+  if (config.hasOwnProperty('extends')) {
+    if (typeof config.extends !== 'string') return defaultConfig
+    var isPath = /\.json$/.test(config.extends)
+    var 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
+
+    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))
+  }
+
+  previouslyVisitedConfigs = []
+
+  return assign(defaultConfig, config)
+}
+
+module.exports = applyExtends