Uses AST to find and remove unused dependencies in AMD modules.
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README.md

gulp-amdcheck Build Status Known Vulnerabilities

Uses AST to find and remove unused dependencies in AMD modules.

Getting Started

npm install gulp-amdcheck --save-dev

The "amdcheck" task

Overview

When an AMD based project grows, number of it's js files grows too and some dependencies of the modules that had been used before, can become useless later. The AMD module loader (e.g. requirejs) loads those useless dependencies from network which can increase initial page load time. This gulp plugin can detect and remove those useless dependencies without modifying source files.

Usage

var amdcheck = require('gulp-amdcheck');

gulp.task('amdcheck', function() {
  gulp.src('**/*.js')
    .pipe(amdcheck())
    .pipe(gulp.dest('dist'))
});

example

source.js

define('module1', ['p1', 'p2'], function (a, b) {
  return a;
});

define('module2', ['p1', 'p2', 'p3'], function (a, b, c) {
  return b;
});

optimized-source.js

define('module1', ['p1'], function (a) {
  return a;
});

define('module2', ['p2'], function (b) {
  return b;
});

Options

var amdcheck = require('gulp-amdcheck');

gulp.task('amdcheck', function() {
  var options = {
    exceptsPaths: ['bootstrap', /^jquery/i]
  };

  gulp.src('**/*.js')
    .pipe(amdcheck(options))
    .pipe(gulp.dest('dist'));
});

excepts

Type: Array Default value: []

An array of strings or RegExps that represent dependency names that should not take into account.

exceptsPaths

Type: Array Default value: []

An array of strings or RegExps that represent dependency paths that should not take into account.

NOTE: exceptsPaths can also be declared before each module definition as a comment of strings of module paths separated by commas. This only applies on the underlying module definition.

source.js

/* exceptsPaths: p3 */
define(['p1', 'p2', 'p3'], function (a, b, c) {
  return b;
});

optimized-source.js

/* exceptsPaths: p3 */
define(['p2', 'p3'], function (b, c) {
  return b;
});

logModuleId

Type: boolean Default value: false

Logs the id of the module if the module id is specified.

logDependencyPaths

Type: boolean Default value: false

Logs the list of dependencies paths of the module.

logDependencyNames

Type: boolean Default value: false

Logs the list of dependencies names of the module.

logUnusedDependencyPaths

Type: boolean Default value: true

Logs the list of unused dependencies paths of the module.

logUnusedDependencyNames

Type: boolean Default value: false

Logs the list of unused dependencies names of the module.

logNumberOfModules

Type: boolean Default value: false

Logs the number of detected modules.

removeUnusedDependencies

Type: boolean Default value: true

Removes detected unused dependencies and save the new files.

errorOnUnusedDependencies

Type: boolean Default value: false

Throws an error if a file contains any unused dependencies.

Release History

  • 2015-04-27   v1.3.2   Add a new option (logNumberOfModules).
  • 2015-04-26   v1.3.1   Fix a bug in logging.
  • 2015-04-25   v1.3.0   Add a new option (errorOnUnusedDependencies).
  • 2014-08-22   v1.2.5   Fix a bug when there are comments between paths and dependencies.
  • 2014-08-16   v1.2.0   Entirely uses AST.
  • 2014-07-20   v1.0.0   Uses AST to find out unused dependencies.
  • 2014-03-27   v0.0.0   First commit of gulp-amdcheck.