avoid-constant-switches

v1.32.0

warning

effort: 5m

teams+

Warns when a switch expression or statement has a constant expression.

Constant expressions in switches always evaluate to the same value and usually indicate a typo or a bug.

Example

❌ Bad:

void fn() {
  // LINT: This expression is constant and will always evaluate to the same value.
  //  Try changing this expression.
  final value = switch (Some._val) {
    ...
  };

  // LINT: This expression is constant and will always evaluate to the same value.
  //  Try changing this expression.
  switch (_another) {
    ...
  };
}

abstract final class Some {
  static const _val = '1';
}

const _another = 10;

✅ Good:

void fn(int another) {
  // Now a parameter
  switch (another) {
    ...
  };
}

Related Rules

• avoid-constant-assert-conditions
• no-equal-switch-expression-cases
• avoid-equal-expressions