Test lsp-typescript, reproduce issue that Error from the Language Server: Request textDocument/hover failed with message: Cannot read property ’map’ of undefined (Internal Error) [7996 times] #Emacs #lsp #typescript

test-lsp-typescript-issue535.el

;;; Test lsp-typescript, reproduce issue that Error from the Language Server: Request textDocument/hover failed with message: Cannot read property ’map’ of undefined (Internal Error) [7996 times]
;;; Usage: /path/to/emacs -nw -Q -l /path/to/test-lsp-typescript-issue535.el /path/to/Microsoft/TypeScriptSamples/angular2/app/todo.ts
;;; Date: 2018-10-24_22.25.12

(toggle-debug-on-error)
(global-set-key (kbd "C-h") 'delete-backward-char)
(global-set-key (kbd "M-h") 'backward-kill-word)
(global-set-key (kbd "<f1>") 'help-command)
(define-key isearch-mode-map "\C-h" 'isearch-delete-char)

;; ------------------------------------------------------------------

(setq user-emacs-directory (format "~/.emacs.d/%s/%s/" (file-name-base load-file-name) emacs-version))
(setq package-user-dir (concat user-emacs-directory "elpa/"))

(unless (load "~/.emacs.d/elpa.el" t)
  (setq package-archives
        '(("gnu" . "https://elpa.gnu.org/packages/")
          ("melpa" . "https://melpa.org/packages/"))))

(package-initialize)

(defun require-packages (&rest packages)
  (dolist (pkg packages)
    (unless (package-installed-p pkg)
      (package-refresh-contents)
      (package-install pkg))
    (require pkg)))

;; ------------------------------------------------------------------

;; (setq el-get-dir (concat user-emacs-directory "el-get/"))
;; (add-to-list 'load-path (concat el-get-dir "el-get"))
;;
;; (setq el-get-git-shallow-clone t)
;; (setq el-get-byte-compile nil)
;; (setq el-get-bundle-byte-compile nil)
;; (setq el-get-install-skip-emacswiki-recipes t)
;;
;; (unless (require 'el-get nil 'noerror)
;;   (with-current-buffer
;;       (url-retrieve-synchronously
;;        "https://raw.githubusercontent.com/dimitri/el-get/master/el-get-install.el")
;;     (goto-char (point-max))
;;     (eval-print-last-sexp)))
;;
;; (remove-hook 'el-get-post-install-hooks 'el-get-post-install-notification)

;; ------------------------------------------------------------------

(require-packages
 'nodenv
 'lsp-mode
 'lsp-ui
 'lsp-typescript
 )

(add-hook 'after-init-hook
          (lambda ()
            ;; node
            (setq nodenv-path (expand-file-name "~/.nodenv/shims"))
            (setenv "PATH" (concat nodenv-path ":" (getenv "PATH")))
            (add-to-list 'exec-path nodenv-path)
            (with-eval-after-load 'lsp-typescript
              (advice-add 'lsp-typescript-enable :before #'nodenv-mode))

            ;; lsp
            (add-hook 'prog-major-mode #'lsp-prog-major-mode-enable)
            (add-hook 'lsp-mode-hook #'lsp-ui-mode)
            (add-hook 'typescript-mode-hook #'lsp-typescript-enable)
            ;; (setq lsp-typescript-server-args
            ;;       (append `("--log-level" "4")
            ;;               lsp-typescript-server-args))

            ;; other
            (view-echo-area-messages)
            ))

(run-hooks 'after-init-hook)
;;; test-lsp-typescript-issue535.el ends here

After adding option --tsserver-path, the issue dispeared:

(setq lsp-typescript-server-args
      (append `(
                ,(concat "--tsserver-path=" (executable-find "tsserver"))
                )
              lsp-typescript-server-args))

Seems lsp-ui depends on --tsserver-path, if not specified, it will keep asking. Is this the problem?