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Stream<T> optionalMap<T>(
Stream<T> source , [T Function(T)? convert]) async* {
if (convert == null) {
yield* source;
} else {
await for (var event in source) {
yield convert(event);
}
}
}
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Stream<T> optionalMap<T>(
Stream<T> source , [T Function(T)? convert]) async* {
if (convert == null) {
yield* source;
} else {
await for (var event in source) {
yield convert(event);
}
}
}