The JavaScript exception "more arguments needed" occurs when there is an error with howa function is called. More arguments need to be provided.

Message

TypeError: Object prototype may only be an Object or null: undefined (V8-based)TypeError: Object.create requires at least 1 argument, but only 0 were passed (Firefox)TypeError: Object.setPrototypeOf requires at least 2 arguments, but only 0 were passed (Firefox)TypeError: Object.defineProperties requires at least 1 argument, but only 0 were passed (Firefox)TypeError: Object prototype may only be an Object or null. (Safari)

Error type

TypeError.

What went wrong?

There is an error with how a function is called. More arguments need to be provided.

Examples

Required arguments not provided

TheObject.create() method requires at least one argument and theObject.setPrototypeOf() method requires at least two arguments:

const obj = Object.create();// TypeError: Object.create requires at least 1 argument, but only 0 were passedconst obj2 = Object.setPrototypeOf({});// TypeError: Object.setPrototypeOf requires at least 2 arguments, but only 1 were passed

You can fix this by settingnull as the prototype, for example:

const obj = Object.create(null);const obj2 = Object.setPrototypeOf({}, null);

See also

• Functions guide