eslint/no-dupe-class-members Correctness

✅ This rule is turned on by default.

What it does

Disallow duplicate class members

Why is this bad?

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

Examples

Examples of incorrect code for this rule:

class A {
  foo() {
    console.log("foo");
  }
  foo = 123;
}
let a = new A();
a.foo(); // Uncaught TypeError: a.foo is not a function

Examples of correct code for this rule:

class A {
  foo() {
    console.log("foo");
  }
}
let a = new A();
a.foo();

How to use

To enable this rule in the CLI or using the config file, you can use:

CLI

oxlint --deny no-dupe-class-members

Config (.oxlintrc.json)

{
  "rules": {
    "no-dupe-class-members": "error"
  }
}

References

• Rule Source