解析故障
- 普偏的解析issue
- npm linked don’t find their dependencies
监听
- 监听是出发change不编译

解析故障

普偏的解析issue

--display-error-details give you more details.
Read [[Configuration]] regarding resolving starting at resolve
- loaders have their own resolving configuration resolveLoader

`npm link`ed don’t find their dependencies

The node.js module resolving algorithm is pretty simple: module dependencies are looked up in node_modules folders in every parent directory of the requiring module. When you npm link modules with peer dependencies that are not in your root directory, modules can no longer be found. (You probably want to consider peerDependencies with npm link as broken by design in node.js.) Note that a dependency to the application (even if this is not the perfect design) is also a kind of peerDependency even if it’s not listed as such in the module’s package.json.

But you can easily workaround that in webpack: Add the node_modules folder of your application to the resolve paths. There are two config options for this: resolve.fallback and resolveLoader.fallback.

Here is a config example:

module.exports = {
  resolve: { fallback: path.join(__dirname, "node_modules") },
  resolveLoader: { fallback: path.join(__dirname, "node_modules") }
};

监听

监听是出发change不编译

监听器不够

Verify that if you have enough available watchers in your system. If this value is too low, the file watcher in Webpack won’t recognize the changes:

cat /proc/sys/fs/inotify/max_user_watches

Arch users, add fs.inotify.max_user_watches=524288 to /etc/sysctl.d/99-sysctl.conf and then execute sysctl --system. Ubuntu users (and possibly others): echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p.

OS-X fsevents bug

On OS-X folders can get corrupted. See this article:

OS X FSEvents bug may prevent monitoring of certain folders

Windows 路径

webpack expects absolute paths for many config options. __dirname + "/app/folder" is wrong, because windows uses \ as path separator. This breaks some stuff.

Use the correct separators. I.e. path.resolve(__dirname, "app/folder") or path.join(__dirname, "app", "folder").

Vim

On some machines Vim is preconfigured with the backupcopy option set to auto. This could potentially cause problems with the system’s file watching mechanism. Switching this option to yes will make sure a copy of the file is made and the original one overwritten on save.

:set backupcopy=yes

故障处理