emberjs/ember.js · error · Error

`not` expects exactly one argument, but received ${args.leng

Error message

`not` expects exactly one argument, but received ${args.length}.

What it means

Error "`not` expects exactly one argument, but received ${args.length}." thrown in emberjs/ember.js.

Source

Thrown at packages/@glimmer/runtime/lib/helpers/not.ts:6

import { DEBUG } from '@glimmer/env';
import { toBool } from '@glimmer/global-context';

export const not = (...args: unknown[]) => {
  if (DEBUG && args.length !== 1) {
    throw new Error(`\`not\` expects exactly one argument, but received ${args.length}.`);
  }

  return !toBool(args[0]);
};

View on GitHub (pinned to 26f97246a8)

When it happens

Trigger: Thrown at packages/@glimmer/runtime/lib/helpers/not.ts:6 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/0d7c5934eab3a18d. Report an issue: GitHub.