rumil_codec

Binary codec library for Dart with ZigZag/Varint encoding, composable BinaryCodec instances, and product type composition via Dart 3 records.

Usage

import 'package:rumil_codec/rumil_codec.dart';

// Primitive codecs
final bytes = intCodec.encode(42);     // ZigZag + LEB128 varint
final value = intCodec.decode(bytes);  // 42

// Compose for domain types
final personCodec = product2(stringCodec, intCodec).xmap(
  (r) => Person(r.$1, r.$2),
  (p) => (p.name, p.age),
);

// Composites
final listCodec = intCodec.list;          // BinaryCodec<List<int>>
final optCodec = stringCodec.nullable;    // BinaryCodec<String?>

For automatic derivation via build_runner, see rumil_codec_builder. Supports both @binarySerializable (binary wire format) and @astSerializable (JSON/YAML/TOML/XML AST encoders).

See the main README for full documentation.