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Change definition to class Optional<T extends Object> #736

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7 changes: 4 additions & 3 deletions lib/src/core/optional.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ import 'dart:collection';
///
/// Both of these should be very rare.
@Deprecated('Generally, migrate to a nullable type.')
class Optional<T> extends IterableBase<T> {
class Optional<T extends Object> extends IterableBase<T> {
/// Constructs an empty Optional.
const Optional.absent() : _value = null;

Expand Down Expand Up @@ -103,7 +103,7 @@ class Optional<T> extends IterableBase<T> {
/// If the Optional is [absent()], returns [absent()] without applying the transformer.
///
/// The transformer must not return `null`. If it does, an [ArgumentError] is thrown.
Optional<S> transform<S>(S Function(T value) transformer) {
Optional<S> transform<S extends Object>(S Function(T value) transformer) {
return _value == null
? Optional<S>.absent()
: Optional<S>.of(transformer(_value!));
Expand All @@ -114,7 +114,8 @@ class Optional<T> extends IterableBase<T> {
/// If the Optional is [absent()], returns [absent()] without applying the transformer.
///
/// Returns [absent()] if the transformer returns `null`.
Optional<S> transformNullable<S>(S? Function(T value) transformer) {
Optional<S> transformNullable<S extends Object>(
S? Function(T value) transformer) {
return _value == null
? Optional<S>.absent()
: Optional<S>.fromNullable(transformer(_value!));
Expand Down