Introduction to Acorn Globals

Acorn Globals is a powerful Node.js module that provides support for identifying and working with global variables in JavaScript code. Equipped with dozens of APIs, it allows developers to seamlessly navigate, analyze, and manipulate global variable declarations.

API Examples

1. Detecting Global Variables

You can easily detect global variables in a given code snippet using Acorn Globals. Below is an example:

  const acorn = require('acorn');
  const walk = require('acorn-walk');
  const globals = require('acorn-globals');

  const sourceCode = 'var a = 1; function b() {}';

  const parsed = acorn.parse(sourceCode, { ecmaVersion: 2020 });
  const globalVariables = globals(parsed);

  globalVariables.forEach(node => {
    console.log(node.name); // Outputs: 'a', 'b'
  });

2. Filtering Out Global Variables

This example demonstrates how to filter out global variables and get their details:

  const sourceCode = 'var x = 42; function myFunc() { y = 10; }';
  const parsed = acorn.parse(sourceCode, { ecmaVersion: 2020 });
  const globalVars = globals(parsed);

  globalVars.forEach(globalVar => {
    console.log(globalVar);
  });

3. Integrating Acorn Globals with a Web Application

Here’s an example of integrating Acorn Globals in a complete web application to analyze scripts:

  const express = require('express');
  const bodyParser = require('body-parser');
  const acorn = require('acorn');
  const globals = require('acorn-globals');

  const app = express();
  app.use(bodyParser.text());

  app.post('/analyze', (req, res) => {
    try {
      const parsed = acorn.parse(req.body, { ecmaVersion: 2020 });
      const globalVars = globals(parsed);
      res.send(JSON.stringify(globalVars.map(g => g.name)));
    } catch (err) {
      res.status(400).send(err.message);
    }
  });

  app.listen(3000, () => {
    console.log('Server running on port 3000');
  });

Conclusion

Acorn Globals is an essential tool for JavaScript developers who need to work with global variables. This guide covers various APIs and a practical example showcasing how to integrate these APIs with a web application.

Whether you’re building tools for static code analysis or simply want to improve your coding practices, Acorn Globals offers the functionality you need.

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