in htmlhint-server/src/server.ts [166:176]
function validateAllTextDocuments(connection: server.IConnection, documents: server.TextDocument[]): void {
let tracker = new server.ErrorMessageTracker();
documents.forEach(document => {
try {
validateTextDocument(connection, document);
} catch (err) {
tracker.add(getErrorMessage(err, document));
}
});
tracker.sendErrors(connection);
}