avoid_unnecessary_extends

v1.0.0 Warning Code Organization

This rule flags a class that explicitly extends Object.

Why use this rule

Every Dart class extends Object already, so the clause states the default while looking like a decision. A reader who sees an extends expects the superclass to matter, and has to recall that this one does not.

A class extending a user-declared Object that shadows dart:core’s is making a real choice, and is left alone.

See also: Object

Don’t

class Repository extends Object {}

Do

class Repository {}

Turning this rule off

This rule is in the opinionated preset.

To disable this rule:

many_lints.yaml

rules:
  avoid_unnecessary_extends: false

To keep the rule on but skip certain paths, use per-rule exclude.

Related rules

• arguments_ordering — Keep named arguments in a configured order.
• avoid_duplicate_mixins — Flag a mixin applied twice in one with clause.
• avoid_generics_shadowing — Avoid generic type parameters that shadow top-level declarations.
• avoid_unnecessary_constructor — Remove a constructor identical to the default one.