not_
{0} isn't a type.
Description
#The analyzer produces this diagnostic when a name is used as a type but declared to be something other than a type.
Example
#The following code produces this diagnostic because f is a function:
dart
f() {}
g(f v) {}
Common fixes
#Replace the name with the name of a type.
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Unless stated otherwise, the documentation on this site reflects Dart 3.9.2. Page last updated on 2025-9-1. View source or report an issue.