ember-cli-tree-shake's Introduction

ember-cli-tree-shake

This Ember CLI addon uses tree shaking to discover dead code within an Ember application.

Currently, only dead/unused computed properties are considered, with a few caveats:

Mixins don't get considered when considering aliveness of a property

Installation

npm install --save-dev ember-cli-tree-shake

Running

ember tree-shake

This addon will currently look for computed properties and observers that are not actually used in either internal methods or in the associated template. For example:

Ember.Component.extend({
  foo: true,

  used: Ember.computed.alias('foo'),

  unused: Ember.computed.not('used')
});

ember-cli-tree-shake will identity that the unused property isn't actually used within the component.

However, if there was an associated template:

{{#if (or used unused)}}
  Hello, world!
{{/if}}

In this case, the "unused" property is actually being evaluated in the template, and therefor isn't actually dead code. ember-cli-tree-shake would no longer identify it as such.

Finally, ember-cli-tree-shake will do a 2nd, 3rd ... nth pass over the tree and keep shaking until no more dead code falls off.

Contributing

npm test

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