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ECMAScript® 2026 Language Specification

The Reflect object:

• is %Reflect%.
• is the initial value of the "Reflect" property of the global object .
• is an ordinary object .
• has a [[Prototype]] internal slot whose value is %Object.prototype% .
• is not a function object .
• does not have a [[Construct]] internal method; it cannot be used as a constructor with the new operator.
• does not have a [[Call]] internal method; it cannot be invoked as a function.

This function performs the following steps when called:

1. If IsCallable (target) is false , throw a TypeError exception.
2. Let args be ?  CreateListFromArrayLike (argumentsList).
3. Perform PrepareForTailCall ().
4. Return ?  Call (target, thisArgument, args).

This function performs the following steps when called:

1. If IsConstructor (target) is false , throw a TypeError exception.
2. If newTarget is not present, set newTarget to target.
3. Else if IsConstructor (newTarget) is false , throw a TypeError exception.
4. Let args be ?  CreateListFromArrayLike (argumentsList).
5. Return ?  Construct (target, args, newTarget).

This function performs the following steps when called:

1. If target is not an Object , throw a TypeError exception.
2. Let key be ?  ToPropertyKey (propertyKey).
3. Let desc be ?  ToPropertyDescriptor (attributes).
4. Return ? target.[[DefineOwnProperty]](key, desc).

This function performs the following steps when called:

1. If target is not an Object , throw a TypeError exception.
2. Let key be ?  ToPropertyKey (propertyKey).
3. Return ? target.[[Delete]](key).

This function performs the following steps when called:

1. If target is not an Object , throw a TypeError exception.
2. Let key be ?  ToPropertyKey (propertyKey).
3. If receiver is not present, then
   1. Set receiver to target.
4. Return ? target.[[Get]](key, receiver).

This function performs the following steps when called:

1. If target is not an Object , throw a TypeError exception.
2. Let key be ?  ToPropertyKey (propertyKey).
3. Let desc be ? target.[[GetOwnProperty]](key).
4. Return FromPropertyDescriptor (desc).

This function performs the following steps when called:

1. If target is not an Object , throw a TypeError exception.
2. Return ? target.[[GetPrototypeOf]]().

This function performs the following steps when called:

1. If target is not an Object , throw a TypeError exception.
2. Let key be ?  ToPropertyKey (propertyKey).
3. Return ? target.[[HasProperty]](key).

This function performs the following steps when called:

1. If target is not an Object , throw a TypeError exception.
2. Return ? target.[[IsExtensible]]().

This function performs the following steps when called:

1. If target is not an Object , throw a TypeError exception.
2. Let keys be ? target.[[OwnPropertyKeys]]().
3. Return CreateArrayFromList (keys).

This function performs the following steps when called:

1. If target is not an Object , throw a TypeError exception.
2. Return ? target.[[PreventExtensions]]().

This function performs the following steps when called:

1. If target is not an Object , throw a TypeError exception.
2. Let key be ?  ToPropertyKey (propertyKey).
3. If receiver is not present, then
   1. Set receiver to target.
4. Return ? target.[[Set]](key, V, receiver).

This function performs the following steps when called:

1. If target is not an Object , throw a TypeError exception.
2. If proto is not an Object and proto is not null , throw a TypeError exception.
3. Return ? target.[[SetPrototypeOf]](proto).

The initial value of the %Symbol.toStringTag% property is the String value "Reflect" .

This property has the attributes { [[Writable]]: false , [[Enumerable]]: false , [[Configurable]]: true }.

A Module Namespace Object is a module namespace exotic object that provides runtime property-based access to a module's exported bindings. There is no constructor function for Module Namespace Objects. Instead, such an object is created for each module that is imported by an ImportDeclaration that contains a NameSpaceImport .

In addition to the properties specified in 10.4.6 each Module Namespace Object has the following own property:

The initial value of the %Symbol.toStringTag% property is the String value "Module" .

This property has the attributes { [[Writable]]: false , [[Enumerable]]: false , [[Configurable]]: false }.

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