detective-amd

Returns a list of dependencies for a given JavaScript file or AST using any of the AMD module syntaxes.

Inspired by substack/node-detective but built for AMD.

npm install detective-amd

• Supports JSX code via node-source-walk.

Usage

Let's say we have the following file definitions:

// a.js
define(['./b', './c'], function (b, c) {
  console.log(b, c);
});

// b.js
define({
  name: 'foo'
});

// c.js
define(function () {
  return 'bar';
});

Here's how you can grab the list of dependencies of a.js synchronously.

ESM

import fs from 'node:fs';
import detective from 'detective-amd';

const srcA = fs.readFileSync('a.js', 'utf8');

// Pass in the source code or an AST (if you've already parsed the file)
console.log(detective(srcA)); // prints ['./b', './c']

CommonJS

const { default: detective } = require('detective-amd');

You may also (optionally) configure the detective via a second object argument detective(src, options) that supports the following options:

• skipLazyLoaded: (boolean) whether or not to omit inner requires in the list of extracted dependencies.
  • Note: this does not affect the REM form since those inner requires are not "lazily" fetched.

Syntax Support

Supports the 4 forms of AMD module syntax:

• "named": define('name', [deps], func)
• "dependency list": define([deps], func)
• "factory": define(func(require))
• "no dependencies": define({})

Extra forms:

• "driver script" (or entry-point) syntax: require([deps], func)
• "REM" (or CommonJS-like) form: define(function(require, exports, module) {}).

Also handles dynamically loaded dependencies (ex: inner requires).

Supports driver scripts

You can also find the dependencies from a script that has a top-level require (an app initialization/driver/entry-point script):

require([
  './a'
], function (a) {
  // My app will get booted up from here
});

Expression-based requires

If there's a require call with a non-literal, non-call-expression argument, an escodegen-generated string representation is included in the dependency list.

For example, if a.js was of the "factory" form and contained a dynamic module name using a binary expression:

// a.js

define(function (require) {
  // Assume str is some variable that gets set to a string dynamically
  // const str = ...

  const b = require('./' + str);
  const c = require('./c');

  console.log(b, c);
});

The dependency list will be: [ '\'./\' + str', './c' ]

• Note: if the argument is a function call (e.g. require(getModule())), it cannot be statically determined and is omitted from the list.

License

MIT