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unnecessary_null_in_if_null_operators

Unnecessary use of '??' with 'null'.

Description

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The analyzer produces this diagnostic when the right operand of the ?? operator is the literal null.

Example

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The following code produces this diagnostic because the right-hand operand of the ?? operator is null:

dart
String? f(String? s) => s ?? null;

Common fixes

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If a non-null value should be used for the right-hand operand, then change the right-hand side:

dart
String f(String? s) => s ?? '';

If there is no non-null value to use for the right-hand operand, then remove the operator and the right-hand operand:

dart
String? f(String? s) => s;