@babel/traverse

Install

  1. $ npm install --save @babel/traverse

Usage

We can use it alongside the babel parser to traverse and update nodes:

  1. import * as parser from "@babel/parser";
  2. import traverse from "@babel/traverse";
  4. const code = `function square(n) {
  5.   return n * n;
  6. }`;
  8. const ast = parser.parse(code);
  10. traverse(ast, {
  11.   enter(path) {
  12.     if (path.isIdentifier({ name: "n" })) {
  13.       path.node.name = "x";
  14.     }
  15.   }
  16. });

Also, we can target particular node types in the Syntax Tree

  1. traverse(ast, {
  2.     FunctionDeclaration: function(path) {
  3.              path.node.id.name = "x";
  4.     }
  5. })

📖 Read the full docs here