@swc/types

Defining AST Nodes

This code sample demonstrates how to define a simple AST node for a variable declaration in JavaScript using the types provided by @swc/types. It represents a variable `x` being declared and initialized with the value `10`.

{
  "type": "VariableDeclaration",
  "kind": "var",
  "declarations": [
    {
      "type": "VariableDeclarator",
      "id": {
        "type": "Identifier",
        "name": "x"
      },
      "init": {
        "type": "Literal",
        "value": 10,
        "raw": "10"
      }
    }
  ]
}

Manipulating AST Nodes

This function takes an AST node and, if it is a numeric literal, doubles its value. It showcases how @swc/types can be used to manipulate AST nodes programmatically.

function updateLiteralValue(node) {
  if (node.type === 'Literal' && typeof node.value === 'number') {
    node.value *= 2;
  }
  return node;
}