Duplicated export presence logic across Harmony dependency classes

[kartikeyg0104]

Summary

HarmonyImportSpecifierDependency and HarmonyExportImportedSpecifierDependency contain near-identical implementations of _getEffectiveExportPresenceLevel(), getWarnings(), and getErrors(). The same exportPresenceMode resolution logic is also duplicated across HarmonyImportDependencyParserPlugin, HarmonyExportDependencyParserPlugin, and ImportParserPlugin. A utility function getNonOptionalPart() is copied verbatim in two parser plugins.

Impact

• Maintenance burden: Any behavioural change to export presence warnings/errors must be applied identically in multiple files, increasing the risk of divergence.
• Code bloat: ~130 lines of duplicated logic across 6 files.
• Bug surface: Inconsistencies between the copies can lead to subtly different behaviour for ESM imports vs re-exports.

[alexander-akait]

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