acorn-umd

acorn-umd

Parse acorn ast for AMD, CommonJS, and ES6 definitions.

The Nodes created align as closely as possible with the nodes generated for acorns ES6 import nodes. Example below

var acorn = require('acorn');
var umd = require('acorn-umd');

var code = `
    import {a, b, c as d} from 'library';
    import foo from 'foo-library';
    
    let _ = require('lodash');
`;

var ast = acorn.parse(code, {ecmaVersion: 6});
var imports = umd(ast, {
    es6: true, amd: false, cjs: true
});

console.log(imports);

[
  { type: 'CJSImport',
    reference: 
     { type: 'VariableDeclaration',
       start: 87,
       end: 113,
       declarations: [Object],
       kind: 'let' },
    specifiers: [ [Object] ],
    start: 87,
    end: 113,
    source: 
     { type: 'Literal',
       reference: [Object],
       value: 'lodash',
       raw: '\'lodash\'',
       start: 103,
       end: 111 }
  },
  { type: 'ImportDeclaration',
    start: 5,
    end: 42,
    specifiers: [ [Object], [Object], [Object] ],
    source: 
     { type: 'Literal',
       start: 32,
       end: 41,
       value: 'library',
       raw: '\'library\'' }
  },
  { type: 'ImportDeclaration',
    start: 47,
    end: 77,
    specifiers: [ [Object] ],
    source: 
     { type: 'Literal',
       start: 63,
       end: 76,
       value: 'foo-library',
       raw: '\'foo-library\'' }
  }
]

AMD Imports

let code = `
  foo();
  define(['foo', 'unused-import'], function($) {
      return $();
  });
`;

let ast = acorn.parse(code, {ecmaVersion: 6});
let parsed = umd(ast, {
  es6: false, amd: true, cjs: false
});

console.log(parsed);

[
 {
  type: 'AMDImport',
  reference: { DEFINE_NODE },
  start: 12,
  end: 81,

  specifiers: [ { type: 'Identifier', start: 54, end: 55, name: '$' } ],
  sources: 
   [ { type: 'Literal',
       reference: [Object],
       value: 'foo',
       raw: '\'foo\'',
       start: 20,
       end: 25 },
     { type: 'Literal',
       reference: [Object],
       value: 'unused-import',
       raw: '\'unused-import\'',
       start: 27,
       end: 42 } ],

  // Grouped [source, variable] name array
  imports: [ [ {SOURCE_NODE}, {VARIABLE_NODE} ], [ {SOURCE_NODE}, undefined ] 
 }
]

Get the scope of a node

import {sample} from 'lodash'

let parsed = umd(ast, {
  es6: false, amd: true, cjs: false
});

let node = sample(parsed);

let scope = node.scope; // scope is null if global otherwise a function node