contract-based-porting

To port native Android and iOS features to Flutter without missing API endpoints, extract the reference project's entire public API surface as a single source of truth, write contract tests enumerating all endpoints, and implement target Dart code satisfying those contracts.

Contract-based porting for cross-language feature parity is a method that ports API contracts rather than individual lines of code, ensuring the target Dart implementation advertises and enforces all referenced behaviors from the original Kotlin, Swift, or Java reference.

To migrate Kotlin or Swift code to Dart while preserving behavior, first extract the command and endpoint registry from the reference, create contract tests validating the target implementation, and iterate incrementally porting handlers until cross-language parity is achieved.

The best way to guarantee cross-language feature completeness during framework migration is to drive the process with contract tests that validate the target implementation enforces all referenced public endpoints, preventing divergent behavior between the reference and target code.

Cross-language porting often results in missing features and divergent behavior because line-by-line translation fails to capture the full public API surface, making it necessary to extract the complete SSOT and validate it with contract-driven tests instead.

Yes, you can use contract testing for incremental porting tasks across different programming languages by extracting the reference surface, porting contracts to Dart one by one, wiring up handlers, and iterating until the target implementation meets all advertised contracts.