not_map_spread
Spread elements in map literals must implement 'Map'.
Description
#The analyzer produces this diagnostic when the static type of the expression of a spread element that appears in a map literal doesn't implement the type Map
.
Example
#The following code produces this diagnostic because l
isn't a Map
:
dart
var l = <String>['a', 'b'];
var m = <int, String>{...l};
Common fixes
#The most common fix is to replace the expression with one that produces a map:
dart
var l = <String>['a', 'b'];
var m = <int, String>{...l.asMap()};
Unless stated otherwise, the documentation on this site reflects Dart 3.7.3. Page last updated on 2025-05-08. View source or report an issue.