PlayerLanguageService / XLRService type conflict when both @player-lang and @player-tools json-language-service are in dependency tree

[shahabdsh]

Repro branch

repro/player-language-service-type-conflict on fork: https://github.com/shahabdsh/xlr/tree/repro/player-language-service-type-conflict

git clone https://github.com/shahabdsh/xlr.git
cd xlr
git checkout repro/player-language-service-type-conflict
pnpm install
pnpm exec tsc --noEmit -p repro/tsconfig.json   # Expected: exit code 2
pnpm exec vitest run player-language-service-type-conflict  # Expected: passes

Error

Types of property 'XLRService' are incompatible.
  Types have separate declarations of a private property 'baseTypes'.

Root cause

Both @player-lang/json-language-service and @player-tools/json-language-service ship their own XLRService class with a private baseTypes property. TypeScript treats these as distinct types because private members contribute to nominal typing.

[shahabdsh]

Created by mistake