avoid-nested-switch-expressions

Reports deeply nested switch expressions.

max-nesting (integer, default: 1) limits nesting of this construct. Local functions and closures restart the nesting count.

Invalid

example.dartdart

int handle(int x) => switch (x) {
  0 => switch (x + 1) { 1 => 2, _ => 3 },
  _ => 4,
};

Nesting exceeds 1 levels. Extract the nested construct into a helper.

1int handle(int x) => switch (x) {

2 0 => switch (x + 1) { 1 => 2, _ => 3 },

∙

example.dartdart

int handle(int x) => switch (x) { 0 => 1, _ => 2 };
int independent(int x) => switch (x) { 1 => 2, _ => 3 };

Set its severity in falcon.json. See the configuration guide.

falcon.jsonjson

{
  "linter": {
    "rules": {
      "complexity": {
        "avoid-nested-switch-expressions": "error"
      }
    }
  }
}

Or silence one occurrence with a suppression comment; the reason is required.

example.dartdart

// falcon-ignore lint/complexity/avoid-nested-switch-expressions: <reason>

avoid-nested-switches
Reports deeply nested switch statements.
avoid-nested-try-statements
Reports deeply nested try statements.
avoid-redundant-asyncavoid-redundant-asyncrecommended
Flags an async function whose body is a single return await ...;.
avoid-unnecessary-containersavoid_unnecessary_containersrecommendedflutter
Flags a Container whose only argument is a child.
avoid-unnecessary-type-assertionsavoid-unnecessary-type-assertionsrecommended
Flags an is check whose result is already guaranteed by the resolved static type.
avoid-unnecessary-type-castsavoid-unnecessary-type-castsrecommended
Flags an as cast to the operand's resolved static type.
cascade-invocationscascade_invocations
Flags consecutive statements that invoke members on the same variable.
cognitive-complexity
Reports function bodies with excessive nesting-weighted control flow.