acorn-globals

What is acorn-globals?

The acorn-globals npm package is used to extract global variables from JavaScript code. It leverages the Acorn JS parser to analyze scripts and identify global variables, which can be useful for various applications such as linting tools, code analysis, and optimization tools.

What are acorn-globals's main functionalities?

Extracting global variables

This feature allows you to parse JavaScript code and extract a list of global variables used in the code. The example shows how to parse a simple script and identify 'console' as a global variable.

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

const code = 'console.log("Hello, world!");';
const ast = acorn.parse(code, {ecmaVersion: 2020});
const globals = acornGlobals(ast);

console.log(globals);

Other packages similar to acorn-globals

eslint-scope

eslint-scope is used to analyze the scope of variables and functions in JavaScript code. While it also deals with identifying variable declarations and their scopes, it is more focused on the scoping rules specific to ECMAScript than just identifying globals. This makes it more suitable for linting purposes compared to acorn-globals, which is more focused on global variable extraction.

globals

The 'globals' package provides a list of built-in global identifiers for various JavaScript environments. It is less dynamic than acorn-globals as it does not analyze code to extract globals but rather provides a static list. This can be useful for quick checks against known globals but lacks the analysis capability of acorn-globals.

README

acorn-globals

Detect global variables in JavaScript using acorn

Installation

npm install acorn-globals

Usage

detect.js

var fs = require('fs');
var detect = require('acorn-globals');

var src = fs.readFileSync(__dirname + '/input.js', 'utf8');

var scope = detect(src);
console.dir(scope);

input.js

var x = 5;
var y = 3, z = 2;

w.foo();
w = 2;

RAWR=444;
RAWR.foo();

BLARG=3;

foo(function () {
    var BAR = 3;
    process.nextTick(function (ZZZZZZZZZZZZ) {
        console.log('beep boop');
        var xyz = 4;
        x += 10;
        x.zzzzzz;
        ZZZ=6;
    });
    function doom () {
    }
    ZZZ.foo();

});

console.log(xyz);

output:

$ node example/detect.js
[ { name: 'BLARG', nodes: [ [Object] ] },
  { name: 'RAWR', nodes: [ [Object], [Object] ] },
  { name: 'ZZZ', nodes: [ [Object], [Object] ] },
  { name: 'console', nodes: [ [Object], [Object] ] },
  { name: 'foo', nodes: [ [Object] ] },
  { name: 'process', nodes: [ [Object] ] },
  { name: 'w', nodes: [ [Object], [Object] ] },
  { name: 'xyz', nodes: [ [Object] ] } ]

License

MIT