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not_a_type

{0} isn't a type.

Description

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The analyzer produces this diagnostic when a name is used as a type but declared to be something other than a type.

Example

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The following code produces this diagnostic because f is a function:

dart 
f() {}
g(f v) {}

Common fixes

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Replace the name with the name of a type.

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.