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Support handling classDecl fromJson(String s) in JsonDecodable #56665

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Support handling classDecl fromJson(String s) in JsonDecodable #56665

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18 changes: 18 additions & 0 deletions pkg/json/lib/json.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -387,6 +387,24 @@ mixin _FromJson on _Shared {
.firstWhereOrNull((c) => c.identifier.name == 'fromJson')
?.identifier;
if (fromJson != null) {
// to support fromJson(String s) or others not Map
final fromJsonFirstParam = constructors
.firstWhereOrNull((c) => c.identifier.name == 'fromJson')
?.positionalParameters
.firstOrNull;

if (fromJsonFirstParam?.type != null) {
return RawCode.fromParts([
if (nullCheck != null) nullCheck,
fromJson,
'(',
jsonReference,
' as ',
fromJsonFirstParam!.type.code,
')',
]);
}

return RawCode.fromParts([
if (nullCheck != null) nullCheck,
fromJson,
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