ember-native-class-codemod

ember-native-class-codemod

A codemod for transforming your ember app code to native JavaScript class syntax with decorators!

Usage

First, install the dependencies that the codemod relies on. These are addons that the codemod will add imports from:

ember install ember-classic-decorator
ember install ember-decorators

Then, boot up your application. Then, the codemod can be run using the following command:

npx ember-native-class-codemod http://localhost:4200/path/to/server [OPTIONS] path/of/files/ or/some**/*glob.js

Options

The codemod accepts the following options, passed as CLI arguments, set in a .codemods.{json,js,cjs,yml} file, or set in a "codemods" object in package.json.

Option	Type	Default	Details
--class-fields / classFields	boolean	true	Enable/disable transformation using class fields
--decorators / decorators	boolean | DecoratorsConfig	true	Set to false to disable transformation using decorators. Set to DecoratorsConfig object (see below) to pass additional decorator options.
--classic-decorator / classicDecorator	boolean	true	Enable/disable adding the @classic decorator, which helps with transitioning Ember Octane
--type / type	See below	See below
--quote / quote	'single' | 'double'	'single'	Whether to use double or single quotes by default for new statements that are added during the codemod.
--ignore-leaking-state / ignoreLeakingState	`string | string[]	['queryParams']	Allow-list for ObjectExpression or ArrayExpression properties to ignore issues detailed in eslint-plugin-ember/avoid-leaking-state-in-ember-objects. In the classic class syntax, using arrays and objects as default properties causes their state to "leak" between instances. If you have custom properties where you know that the shared state won't be a problem (for example, read-only configuration values), you can use this config to ignore them. NOTE: Passing this option will override the defaults, so ensure you include 'queryParams' in the list unless you explicitly wish to disallow it. Pass as a comma-separated string if using as a CLI-option. Otherwise pass as an array of strings.
DecoratorsConfig	An object with the following properties.	See below.	See below.
DecoratorsConfig.inObjectLiterals	string | string[]	[]	Allow-list for decorators currently applied to object literal properties that can be safely applied to class properties. Pass as a comma-separated string if using as a CLI-option. Otherwise pass as an array of strings. NOTE: Decorators on object methods will be allowed by default.

Gathering Runtime Data

The first argument that you must pass to the codemod is the URL of a running instance of your application. The codemod opens up your application and analyzes the classes directly, so it can transform them, which is why it needs this URL. Any classes that were not analyzed will not be transformed. This includes classes that are private to a module and never exported.

If you have any lazily loaded modules, such as modules from Ember Engines, you'll need to make sure that the URL you provide loads these modules as well. Otherwise, the codemod will not be able to detect them or analyze them.

To disable this feature, run with NO_TELEMETRY=true and omit the path to your local server:

NO_TELEMETRY=true npx ember-native-class-codemod [OPTIONS] path/of/files/ or/some**/*glob.js

DANGER: Disabling the telemetry may result in incorrect behavior. Carefully vet the results.

Types

The type option can be used to further narrow down transforms to a particular type of ember object within the application or addon. The types can be any of the following:

Type	Option
Services	--type=services
Routes	--type=routes
Components	--type=components
Controllers	--type=controllers
Adapters	--type=adapters
Helpers	--type=helpers

The path of the file being transformed is matched against the glob pattern of the type to determine whether to run the specific transforms.

If a type is not provided, the codemods will run against all the types in the path provided.

Debugging

The codemods log execution information in the codemods.log file in the current directory where the codemods are being executed. Specifically, details such as failures and reasons for failures, are logged. This would be the recommended starting point for debugging issues related to these codemods.

Unsupported Types

While the codemods transforms many types of ember objects, it does not support transformation of

• ember-data classes such as DS.Model, DS.Adapter etc
• Ember Objects with objects or arrays as direct properties (actions and queryParams are the exception). See eslint-plugin-ember/avoid-leaking-state-in-ember-objects for more details.
• Ember objects with computed properties that use the meta or property modifiers.

More Transform Examples

• ember-object
• helpers

Contributing

Installation

• clone the repo
• change into the repo directory
• pnpm

Running Tests

• pnpm test

Update Documentation

• pnpm update-docs