@babel/traverse
@babel/traverse maintains the overall tree state, and is responsible for replacing, removing, and adding nodes.
Install
$ npm install --save @babel/traverse
Usage
We can use it alongside the babel parser to traverse and update nodes:
import * as parser from "@babel/parser";
import traverse from "@babel/traverse";
const code = `function square(n) {
return n * n;
}`;
const ast = parser.parse(code);
traverse(ast, {
enter(path) {
if (path.isIdentifier({ name: "n" })) {
path.node.name = "x";
}
}
});