build

node_modules/jest-config/build/utils.js

@@ -86,7 +86,7 @@ const resolve = (resolver, {key, filePath, rootDir, optional}) => {
       filePath
     )} in the ${_chalk().default.bold(key)} option was not found.
          ${_chalk().default.bold('<rootDir>')} is: ${rootDir}`);
-  }
+  } /// can cast as string since nulls will be thrown
 
   return module;
 };
@@ -106,31 +106,32 @@ const replaceRootDirInPath = (rootDir, filePath) => {
     rootDir,
     _path().default.normalize('./' + filePath.substr('<rootDir>'.length))
   );
-}; // TODO: Type as returning same type as input
+};
 
 exports.replaceRootDirInPath = replaceRootDirInPath;
 
 const _replaceRootDirInObject = (rootDir, config) => {
-  if (config !== null) {
-    const newConfig = {};
+  const newConfig = {};
 
-    for (const configKey in config) {
-      newConfig[configKey] =
-        configKey === 'rootDir'
-          ? config[configKey]
-          : _replaceRootDirTags(rootDir, config[configKey]);
-    }
-
-    return newConfig;
+  for (const configKey in config) {
+    newConfig[configKey] =
+      configKey === 'rootDir'
+        ? config[configKey]
+        : _replaceRootDirTags(rootDir, config[configKey]);
   }
 
-  return config;
-}; // TODO: Type as returning same type as input
+  return newConfig;
+};
 
 const _replaceRootDirTags = (rootDir, config) => {
+  if (config == null) {
+    return config;
+  }
+
   switch (typeof config) {
     case 'object':
       if (Array.isArray(config)) {
+        /// can be string[] or {}[]
         return config.map(item => _replaceRootDirTags(rootDir, item));
       }