length

The size, in bytes, of the array buffer to create.

options Optional

An object, which can contain the following properties:

maxByteLength Optional

The maximum size, in bytes, that the shared array buffer can be resized to.

A new SharedArrayBuffer object of the specified size, with its maxByteLength property set to the specified maxByteLength if one was specified. Its contents are initialized to 0.

SharedArrayBuffer constructors are required to be constructed with a new operator. Calling a SharedArrayBuffer constructor as a function without new will throw a TypeError.

const sab = SharedArrayBuffer(1024);
// TypeError: calling a builtin SharedArrayBuffer constructor
// without new is forbidden

const sab = new SharedArrayBuffer(1024);

In this example, we create an 8-byte buffer that is growable to a max length of 16 bytes, then grow() it to 12 bytes:

const buffer = new SharedArrayBuffer(8, { maxByteLength: 16 });

buffer.grow(12);

• Atomics
• ArrayBuffer
• JavaScript typed arrays guide