file watcher improve

[kikyous]

yesterday I found change vs code settings to use fs events can stop volar polling fs files.

"typescript.tsserver.watchOptions": {
    "watchDirectory": "useFsEvents",
    "watchFile": "useFsEvents",
    "useFsEvents": true,
    "usePolling": false
}

#507 (comment)

But it seems not work when I restart vscode.

I don't know much about lsp, but from https://code.visualstudio.com/api/language-extensions/language-server-extension-guide#implementing-a-language-server, there is some built in event we can use (maybe):

connection.onDidChangeWatchedFiles(_change => {
  // Monitored files have change in VS Code
  connection.console.log('We received a file change event');
});

Vetur use this event too:
https://github.com/vuejs/vetur/blob/HEAD/server/src/services/vls.ts#L474

Can volar use this ?

[johnsoncodehk]

Yes we can try this.

[kikyous]

I found some issues in vetur maybe useful to you.
vuejs/vetur#355
vuejs/vetur@6ef2132