Bun creates .npmrc even when bunfig.toml already exists #134
Description
Currently, when using Bun as the package manager, the JSR CLI creates an .npmrc file for registry configuration on Bun v1.1.18+ (which supports npmrc), even if a bunfig.toml file already exists in the project.
This behavior doesn't respect existing Bun-specific configuration and can cause confusion in projects that prefer to use bunfig.toml for all Bun-related settings.
Expected behavior:
If a bunfig.toml file already exists in the project, it should be used for JSR registry configuration regardless of the Bun version, instead of creating a new .npmrc file.
Current behavior:
Bun v1.1.17 and lower: Creates/uses bunfig.toml (no npmrc support)
Bun v1.1.18+: Creates/uses .npmrc even if bunfig.toml exists
Proposed solution:
Check for existing bunfig.toml first and use it if present, regardless of Bun version support for .npmrc.
PR incoming