SyntaxError: getter and setter for private name #x should either be both static or non-static

The JavaScript exception "mismatched placement" occurs when a private getter and setter are mismatched in whether or not they are {{jsxref("Classes/static", "static")}}.

Message#

SyntaxError: Identifier '#x' has already been declared (V8-based)
SyntaxError: getter and setter for private name #x should either be both static or non-static (Firefox)
SyntaxError: Cannot declare a private non-static getter if there is a static private setter with used name. (Safari)

Error type#

{{jsxref("SyntaxError")}}

What went wrong?#

Private getters and setters for the same name must either be both {{jsxref("Classes/static", "static")}}, or both non-static. This limitation does not exist for public methods.

Examples#

Mismatched placement#

```js-nolint example-bad class Test { static set #foo(_) {} get #foo() {} }

// SyntaxError: getter and setter for private name #foo should either be both static or non-static

Since `foo` is [private](/en-US/docs/Web/JavaScript/Reference/Classes/Private_elements), the methods must be either both {{jsxref("Classes/static", "static")}}:

```js example-good
class Test {
  static set #foo(_) {}
  static get #foo() {}
}

or non-static:

js example-good class Test { set #foo(_) {} get #foo() {} }

See also#

• {{jsxref("Functions/get", "get")}}
• {{jsxref("Functions/set", "set")}}
• {{jsxref("Classes/static", "static")}}
• Private elements