Is there a better way to switch LSPs between Deno (deno lsp) and Node.js (typescript-language-server)?

[ras0q]

This discussion is similar to this comment.

By default languege settings, typescript-language-server LSP is used when you open the .ts file.
However, if .ts file is written for Deno, LSP will show errors for Deno-specific syntax.

Thanks to Wiki page, I already understand that writing these settings in ./.helix/languages.toml under the project root can activate Deno LSP.

[[language]]
name = "typescript"
shebangs = ["deno"]
roots = ["deno.json", "deno.jsonc"]
file-types = ["ts"]
language-servers = ["deno-lsp"]
auto-format = true

[language-server.deno-lsp]
command = "deno"
args = ["lsp"]
environment = { NO_COLOR = "1" }

[language-server.deno-lsp.config.deno]
enable = true

It's hard to write this in the project setup every time...
Is it possible to write only the [language-server.deno-lsp.config.deno] setting in my project (and the rest in the global `~/.config/helix/languages.toml) to enable the Deno LSP?

I tried to create a new language setting with name typescript_deno, but syntax highlighting does not work (Is it a bug?)

$ hx --health typescript_deno
Configured language servers:
  ✓ deno: /path/to/bin/deno
Configured debug adapter: None
Configured formatter: None
Highlight queries: ✘
Textobject queries: ✘
Indent queries: ✘

Settings:

# ~/.config/helix/languages.toml
[[language]]
name = "typescript_deno" # changed from typescript
scope = "source.ts" # added
grammar = "typescript" # added
shebangs = ["deno"]
roots = ["deno.json", "deno.jsonc"]
file-types = ["ts"]
language-servers = ["deno-lsp"]
auto-format = true

[language-server.deno-lsp]
command = "deno"
args = ["lsp"]
environment = { NO_COLOR = "1" }

# project/.helix/languages.toml
[language-server.deno-lsp.config.deno]
enable = true

[kirawi]

See #8372 (reply in thread)

[ras0q]

Thank you! I got both LSPs working properly with the following minimal configuration without local languages.toml.

# ~/.config/helix/languages.toml
[[language]]
name = "typescript"
roots = ["deno.json", "deno.jsonc", "package.json"]
language-servers = ["typescript-language-server", "deno-lsp"]

[language-server.typescript-language-server]
required-root-patterns = ["package.json"]

[language-server.deno-lsp]
command = "deno"
args = ["lsp"]
config = { deno = { enable = true } }
required-root-patterns = ["deno.*"]

Is it possible to explicitly activate Deno LSP in open .ts files when there is no deno.json?

[ras0q]

As a work-around, I was able to activate it by overriding required-root-patterns in .helix/languages.toml.

# .helix/languages.toml
[language-server.deno-lsp]
required-root-patterns = []