prefer_iterable_wheretype

Use 'whereType' to select elements of a given type.

The analyzer produces this diagnostic when the method Iterable.where is being used to filter elements based on their type.

The following code produces this diagnostic because the method where is being used to access only the strings within the iterable:

Iterable<Object> f(Iterable<Object> p) => p.where((e) => e is String);

Rewrite the code to use whereType:

Iterable<String> f(Iterable<Object> p) => p.whereType<String>();

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