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undefined_method

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The method '{0}' isn't defined for the '{1}' function type.

The method '{0}' isn't defined for the type '{1}'.

Description

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The analyzer produces this diagnostic when it encounters an identifier that appears to be the name of a method but either isn't defined or isn't visible in the scope in which it's being referenced.

Example

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The following code produces this diagnostic because the identifier removeMiddle isn't defined:

dart
int f(List<int> l) => l.removeMiddle();

Common fixes

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If the identifier isn't defined, then either define it or replace it with the name of a method that is defined. The example above can be corrected by fixing the spelling of the method:

dart
int f(List<int> l) => l.removeLast();

Unless stated otherwise, the documentation on this site reflects Dart 3.8.0. Page last updated on 2025-05-08. View source or report an issue.