The transformEngines function lacked test coverage for its transformation of engines.runtime to devEngines.runtime and validation logic.

Changes

• Added transformEngines.test.ts with 7 test cases covering:
  • Runtime field migration from engines to devEngines
  • Preservation of existing devEngines fields
  • Conflict detection when both fields are defined
  • No-op behavior when engines.runtime is absent
  • Edge cases (empty engines object, manifests with additional fields)

All tests achieve 100% coverage of the transformEngines function.

Example

const manifest = {
  engines: {
    node: '>=18',
    runtime: { name: 'bun', version: '1.0.0' }
  }
}

transformEngines(manifest)
// Returns:
// {
//   engines: { node: '>=18' },
//   devEngines: { runtime: { name: 'bun', version: '1.0.0' } }
// }

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