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Rslint

    no-dupe-class-members

    Configuration

    rslint.config.ts
    import { defineConfig, ts } from '@rslint/core';

export default defineConfig([
  ts.configs.recommended,
  {
    rules: {
      '@typescript-eslint/no-dupe-class-members': 'error',
    },
  },
]);

    Rule Details

    Disallow duplicate class members.

    If there are declarations of the same name in class members, the last declaration overwrites other declarations silently. It can cause unexpected behaviors.

    This rule extends the base ESLint no-dupe-class-members rule to support TypeScript method overload signatures, which should not be flagged as duplicates.

    Examples of incorrect code for this rule:

    class A {
  foo() {}
  foo() {}
}

class B {
  foo;
  foo() {}
}

class C {
  static bar() {}
  static bar() {}
}

    Examples of correct code for this rule:

    class A {
  foo() {}
  bar() {}
}

class B {
  get foo() {}
  set foo(value) {}
}

class C {
  static foo() {}
  foo() {}
}

// TypeScript method overloads are allowed
class D {
  foo(a: string): string;
  foo(a: number): number;
  foo(a: any): any {}
}

    Original Documentation