Module pattern 

A pattern binding or assignment node.

A Pattern Corresponds to the BindingPattern and the AssignmentPattern nodes, each of which is used in different situations and have slightly different grammars. For example, a variable declaration combined with a destructuring expression is a BindingPattern:

const obj = { a: 1, b: 2 };
const { a, b } = obj; // BindingPattern

On the other hand, a simple destructuring expression with already declared variables is called an AssignmentPattern:

let a = 1;
let b = 3;
[a, b] = [b, a]; // AssignmentPattern

Structs

ArrayPattern

An array binding or assignment pattern.

ObjectPattern

An object binding or assignment pattern.

Enums

ArrayPatternElement

The different types of bindings that an array binding pattern may contain.

ObjectPatternElement

The different types of bindings that an ObjectPattern may contain.

Pattern

An object or array pattern binding or assignment.