Can’t run typescript-language-server over TRAMP (Windows local machine, Linux remote machine)

[Aankhen]

Thank you for the bug report

• I am using the latest version of lsp-mode related packages.
• I checked FAQ and Troubleshooting sections
• You may also try reproduce the issue using clean environment using the following command: M-x lsp-start-plain

Bug description

I can’t run typescript-language-server over TRAMP because the rootUri has two extra slashes:

  "rootPath": "/home/user/src",
  "clientInfo": {
    "name": "emacs",
    "version": "GNU Emacs 27.2 (build 1, x86_64-w64-mingw32)\n of 2021-03-26"
  },
  "rootUri": "file:////home/user/src",

Steps to reproduce

1. Set up SSH and install typescript-language-server on remote
   machine.
2. Set up LSP and make TRAMP use remote language server:

(require 'typescript-mode)
(require 'lsp)

(lsp-register-client
    (make-lsp-client :new-connection (lsp-tramp-connection (list "typescript-language-server" "--stdio"))
                    :major-modes '(typescript-mode)
                    :remote? t
                    :server-id 'ts-ls))

(with-eval-after-load 'tramp
  (add-to-list 'tramp-remote-path 'tramp-own-remote-path))

3. Open TypeScript file on remote machine.
4. M-x typescript-mode
5. M-x lsp

Expected behavior

typescript-language-server successfully starts on the remote machine.

Which Language Server did you use?

lsp-javascript with typescript-language-server@0.9.6

OS

Windows

Error callstack

*Messages*:

LSP :: Connected to [ts-ls:39720/starting].
LSP :: Error from the Language Server: Request initialize failed with message: [UriError]: If a URI does not contain an authority component, then the path cannot begin with two slash characters ("//") (Internal Error)

*lsp-log* (names changed):

Command "typescript-language-server --stdio" is present on the path.
Command "typescript-language-server --stdio" is present on the path.
Found the following clients for /ssh:hostname:/home/username/src/index.tsx: (server-id ts-ls, priority 0)
The following clients were selected based on priority: (server-id ts-ls, priority 0)

Log buffer (names changed):

  "rootPath": "/home/user/src",
  "clientInfo": {
    "name": "emacs",
    "version": "GNU Emacs 27.2 (build 1, x86_64-w64-mingw32)\n of 2021-03-26"
  },
  "rootUri": "file:////home/user/src",