fix: keep nested union imports in freezed discriminated-union variants#464
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Carapacik merged 3 commits intoJun 22, 2026
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A discriminated-union variant is inlined into its parent union file, so the parent union is injected into the variant's import set. The freezed import filter dropped every import containing "union" for such variants to avoid that back-import, but this also removed the union files generated for the variant's own nested `oneOf` properties. The variant then referenced undefined union types and failed to compile. Only drop union imports that the variant does not reference through its own properties (the parent union), keeping the union files for its inline `oneOf` fields. Adds an e2e regression test (a union variant whose member carries a nested discriminated union).
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@CallMeSH please resolve conflicts |
Carapacik
approved these changes
Jun 22, 2026
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Problem
With
json_serializer: freezed, a DTO that is a discriminated-union variant and also contains its own nestedoneOfproperty generates a file that references the nested union type without importing it, so the generated code does not compile (undefined*Uniontype).A non-variant DTO with the same nested union compiles fine — the bug only affects variants.
Root cause
_filterUnionImportsForFreezedindart_freezed_dto_template.dartdrops every import whose name contains"union"whendiscriminatorValue != null. The intent is to drop the parent-union back-import (the variant is inlined into the parent union file). But the blunt match also drops the union files generated for the variant's own nestedoneOfproperties, which are genuinely referenced.Fix
Only drop union imports the variant does not reference through its own properties; keep the union files for its inline
oneOffields.Tests
Adds an e2e regression test
xof/freezed_nested_union_variant_imports(a discriminated union whoseCatvariant carries a nested discriminated uniontoy). Full suite passes;dart formatanddart analyzeclean.