Enables your app or addon to use decorators for ES6 classes.

ember install @ember-decorators/babel-transforms

If you're developing an addon and only intend to use decorators in your tests and / or dummy app (tests/dummy), just install this addon as a regular devDependency:

ember install @ember-decorators/babel-transforms

You can now use decorators in your tests/* directories, but not in your addon directory.

If you're developing an addon that only uses decorators interally, e.g. you don't export any decorators that the user is supposed to use, then it's sufficient to install this addon with the -S flag, so it is added as a dependency as opposed to the default devDependency

ember install -S @ember-decorators/babel-transforms

In addition to tests/*, you can now use decorators in your addon directory. However, do not make them public API, i.e. do not expect the user of you addon to be able to use these decorators.

If you want to not only employ decorators internally, but also make them public API, so that users of your addon can use your decorators, then the consuming app or addon has to be properly configured for decorator usage.

This means, that users of your addon are required to add @ember-decorators/babel-transforms to their project as well. You can either instruct them to do so in your installation instructions and link them here or automatically add the dependency in the default blueprint using addAddonToProject:

// blueprints/<your-addon-name>/index.js
module.exports = {
  normalizeEntityName() {}, // no-op since we're just adding dependencies

  afterInstall() {
    return this.addAddonToProject('@ember-decorators/babel-transforms'); // is a promise
  }
};

You can also add it as a dependency (as opposed to the default devDependency):

// blueprints/<your-addon-name>/index.js
module.exports = {
  normalizeEntityName() {}, // no-op since we're just adding dependencies

  afterInstall() {
    return this.addAddonToProject({
      name: '@ember-decorators/babel-transforms',
      blueprintOptions: { save: true }
    }); // is a promise
  }
};

Also, don't forget to add @ember-decorators/babel-transforms to your own addon in the first place. 😉

ember install -S @ember-decorators/babel-transforms

You can configure this addon in you ember-cli-build.js file:

/* eslint-env node */
'use strict';

const EmberAddon = require('ember-cli/lib/broccoli/ember-addon');

module.exports = function(defaults) {
  const app = new EmberAddon(defaults, {
    '@ember-decorators/babel-transforms': {
      disable: false
    }
  });

  return app.toTree();
};

The only option is disable, which defaults to false. If you set disable to true, Babel will not get configured for decorators.