emberjs/ember.js · error · Error

args proxies do not have real property descriptors, so you s

Error message

args proxies do not have real property descriptors, so you should never need to call getOwnPropertyDescriptor yourself. This code exists for enumerability, such as in for-in loops and Object.keys(). Attempted to get the descriptor for `${String(prop)}`

What it means

Error "args proxies do not have real property descriptors, so you should never need to call getOwnPropertyDescriptor yourself. This code exists for enumerability, such as in for-in loops and Object.keys(). Attempted to get the descriptor for `${String(prop)}`" thrown in emberjs/ember.js.

Source

Thrown at packages/@glimmer/manager/lib/util/args-proxy.ts:90

  }

  // eslint-disable-next-line @typescript-eslint/no-empty-object-type -- @fixme
  has(_target: {}, prop: string | number | symbol) {
    return prop in this.named;
  }

  ownKeys() {
    return Object.keys(this.named);
  }

  isExtensible() {
    return false;
  }

  // eslint-disable-next-line @typescript-eslint/no-empty-object-type -- @fixme
  getOwnPropertyDescriptor(_target: {}, prop: string | number | symbol) {
    if (DEBUG && !(prop in this.named)) {
      throw new Error(
        `args proxies do not have real property descriptors, so you should never need to call getOwnPropertyDescriptor yourself. This code exists for enumerability, such as in for-in loops and Object.keys(). Attempted to get the descriptor for \`${String(
          prop
        )}\``
      );
    }

    return {
      enumerable: true,
      configurable: true,
    };
  }
}

class PositionalArgsProxy implements ProxyHandler<[]> {
  declare set?: (target: [], prop: string | number | symbol) => boolean;
  declare ownKeys?: (target: []) => string[];

  constructor(private positional: CapturedPositionalArguments) {}

View on GitHub (pinned to 26f97246a8)

When it happens

Trigger: Thrown at packages/@glimmer/manager/lib/util/args-proxy.ts:90 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of emberjs/ember.js@26f97246a8 (2026-09-01). Data as JSON: /api/errors/ae8edea883c9a766. Report an issue: GitHub.