Function formatProblem

src/features/pkg/attw.ts:190–246

* Format an ATTW problem for display

(packageName: string, problem: Problem)

 * Format an ATTW problem for display
 */
function formatProblem(packageName: string, problem: Problem): string {
  const resolutionKind =
    'resolutionKind' in problem ? ` (${problem.resolutionKind})` : ''
  const entrypoint =
    'entrypoint' in problem
      ? ` at ${slash(path.join(packageName, problem.entrypoint))}`
      : ''

  switch (problem.kind) {
    case 'NoResolution':
      return `  ❌ No resolution${resolutionKind}${entrypoint}`

    case 'UntypedResolution':
      return `  ⚠️  Untyped resolution${resolutionKind}${entrypoint}`

    case 'FalseESM':
      return `  🔄 False ESM: Types indicate ESM (${problem.typesModuleKind}) but implementation is CJS (${problem.implementationModuleKind})\n     Types: ${problem.typesFileName} | Implementation: ${problem.implementationFileName}`

    case 'FalseCJS':
      return `  🔄 False CJS: Types indicate CJS (${problem.typesModuleKind}) but implementation is ESM (${problem.implementationModuleKind})\n     Types: ${problem.typesFileName} | Implementation: ${problem.implementationFileName}`

    case 'CJSResolvesToESM':
      return `  ⚡ CJS resolves to ESM${resolutionKind}${entrypoint}`

    case 'NamedExports': {
      const missingExports =
        problem.missing?.length > 0
          ? ` Missing: ${problem.missing.join(', ')}`
          : ''
      const allMissing = problem.isMissingAllNamed
        ? ' (all named exports missing)'
        : ''
      return `  📤 Named exports problem${allMissing}${missingExports}\n     Types: ${problem.typesFileName} | Implementation: ${problem.implementationFileName}`
    }

    case 'FallbackCondition':
      return `  🎯 Fallback condition used${resolutionKind}${entrypoint}`

    case 'FalseExportDefault':
      return `  🎭 False export default\n     Types: ${problem.typesFileName} | Implementation: ${problem.implementationFileName}`

    case 'MissingExportEquals':
      return `  📝 Missing export equals\n     Types: ${problem.typesFileName} | Implementation: ${problem.implementationFileName}`

    case 'InternalResolutionError':
      return `  💥 Internal resolution error in ${problem.fileName} (${problem.resolutionOption})\n     Module: ${problem.moduleSpecifier} | Mode: ${problem.resolutionMode}`

    case 'UnexpectedModuleSyntax':
      return `  📋 Unexpected module syntax in ${problem.fileName}\n     Expected: ${problem.moduleKind} | Found: ${problem.syntax === 99 ? 'ESM' : 'CJS'}`

    case 'CJSOnlyExportsDefault':
      return `  🏷️  CJS only exports default in ${problem.fileName}`

    default:
      return `  ❓ Unknown problem: ${JSON.stringify(problem)}`
  }
}