detect-import-require

This is like detective, but with a narrow focus and thin API, specifically aimed at supporting either import and/or require statements, and not much more.

Install

npm install detect-import-require --save

Example

Given the following file:

source.js

var foo = require('a').foo
var bar = require('./blah.js')
import { uniq } from 'lodash'
import { resolve } from 'path'

var fs = require('fs')
var detect = require('detect-import-require')

var src = fs.readFileSync('source.js', 'utf8')
console.log(detect(src))
//=> [ 'a', './blah.js', 'lodash', 'path' ]

See Custom AST for details on parsing additional language syntax, such as JSX or async/await.

Usage

modules = detect(src, [opt])

Returns an array of module names (require paths) from the given src String, Buffer or AST. By default, looks for import and require statements. Results are not de-duplicated, and are in the order they are found.

Options:

• imports (Boolean) - whether to look for import statements, default true
• requires (Boolean) - whether to look for require statements, default true

modules = detect.find(src, [opt])

Takes the same options as above, but returns an object with the following additional data:

{
  strings: [],
  expressions: [],
  nodes: []
}

Where strings is the array of module names, expressions is an array of expressions from dynamic require() statements, and nodes is an array of AST nodes for each found require/import statement.

Expressions do not appear in imports, and look like this:

[
  "path.join(__dirname, '/foo.js')",
  "__dirname + '/file.js'"
]

Custom AST

You can also pass a parsed AST, e.g. if you have a special build of acorn or want full control over parsing options. Here is an example with JSX:

var detect = require('detect-import-require')
var acorn = require('acorn-jsx');
var jsx = [
  "import 'foo';",
  "ReactDOM.render(",
    "<h1>Hello World</h1>,",
    "document.getElementById('root')",
  ");"
].join('\n');

var ast = acorn.parse(jsx, {
  ecmaVersion: 6,
  sourceType: 'module',
  allowReserved: true,
  allowReturnOutsideFunction: true,
  allowHashBang: true,
  plugins: {
    jsx: true
  }
})

detect(ast)
// => [ 'foo' ]

License

MIT, see LICENSE.md for details.