How to start tsserver without first opening a .ts file?

[uri]

I want to open vim at the project root and run :CocList -I symbols but tsc isn't started until I open any .ts file. I have a tsconfig.json in my project's root.

I have workspace.patterns in my global config and this project has a .git folder.

  "workspace.rootPatterns": [
    ".vim",
    ".git",
    ".hg",
    ".projections.json",
    "go.mod"
  ],