acorn

Parsing JavaScript

This feature allows you to parse a string of JavaScript code into an abstract syntax tree (AST). The 'ecmaVersion' option specifies the ECMAScript version to parse.

const acorn = require('acorn');
const AST = acorn.parse('const x = 1;', { ecmaVersion: 2020 });

Walking the AST

This feature involves traversing the generated AST to visit different types of nodes. The 'acorn-walk' package provides utilities for walking the AST.

const acorn = require('acorn');
const walk = require('acorn-walk');
const AST = acorn.parse('const x = 1;', { ecmaVersion: 2020 });
walk.simple(AST, {
  Literal(node) {
    console.log(`Found a literal: ${node.value}`);
  }
});

Dynamic Import Parsing

This feature allows acorn to handle dynamic imports in the code. The 'acorn-dynamic-import' plugin extends acorn's capabilities to parse dynamic import() expressions.

const acorn = require('acorn');
const dynamicImport = require('acorn-dynamic-import').default;
const parser = acorn.Parser.extend(dynamicImport);
const AST = parser.parse('import("./module.js");', { ecmaVersion: 2020 });