MyEtherWallet

MyEtherWallet (v4+)

Run:

npm run dev # run app in dev mode

Build:

npm run build # build app

It generates app in dist folder.

Test:

npm run test # run tests with Jest

Folder structure:

│
├── common - Your App
│   ├── actions - application actions
│   ├── api - Services and XHR utils(also custom form validation, see InputComponent from components/common)
│   ├── components - components according to "Redux philosophy"
│   ├── config - frontend config depending on REACT_WEBPACK_ENV
│   ├── containers - containers according to "Redux philosophy"
│   ├── reducers - application reducers
│   ├── routing - application routing
│   ├── index.jsx - entry
│   ├── index.html
├── static
├── webpack_config - Webpack configuration
├── jest_config - Jest configuration

Docker setup

You should already have docker and docker-compose setup for your platform as a pre-req.

docker-compose up

Style Guides and Philosophies

The following are guides for developers to follow for writing compliant code.

Redux and Actions

Each reducer has one file in reducers/[namespace].js that contains the reducer and initial state, one file in actions/[namespace].js that contains the action creators and their return types, and optionally one file in sagas/[namespace].js that handles action side effects using redux-saga.

The files should be laid out as follows:

Reducer

• State should be explicitly defined and exported
• Initial state should match state flow typing, define every key
• Reducer function should handle all cases for actions. If state does not change as a result of an action (Because it merely kicks off side-effects in saga) then define the case above default, and have it fall through.

// @flow
import type { NamespaceAction } from "actions/namespace";

export type State = { /* Flowtype definition for state object */ };
export const INITIAL_STATE: State = { /* Initial state shape */ };

export function namespace(
	state: State = INITIAL_STATE,
	action: NamespaceAction
): State {
	switch (action.type) {
		case 'NAMESPACE_NAME_OF_ACTION':
			return {
				...state,
				// Alterations to state
			};

		case 'NAMESPACE_NAME_OF_SAGA_ACTION':
		default:
			// Ensures every action was handled in reducer
			// Unhandled actions should just fall into default
			(action: empty);
			return state;
	}
}

Actions

• Define each action object type beside the action creator
• Export a union of all of the action types for use by the reducer

/*** Name of action ***/
export type NameOfActionAction = {
	type: 'NAMESPACE_NAME_OF_ACTION',
	/* Rest of the action object shape */
};

export function nameOfAction(): NameOfActionAction {
	return {
		type: 'NAMESPACE_NAME_OF_ACTION',
		/* Rest of the action object */
	};
};

/*** Action Union ***/
export type NamespaceAction =
	| ActionOneAction
	| ActionTwoAction
	| ActionThreeAction;

Action Constants

Action constants are not used thanks to flow type checking. To avoid typos, we use (action: empty) in the default case which assures every case is accounted for. If you need to use another reducer's action, import that action type into your reducer, and create a new action union of your actions, and the other action types used.

Styling

Legacy styles are housed under common/assets/styles and written with LESS. However, going forward, each styled component should create a a .scss file of the same name in the same folder, and import it like so:

import React from "react";

import "./MyComponent.scss";

export default class MyComponent extends React.component {
	render() {
		return (
			<div className="MyComponent">
				<div className="MyComponent-child">Hello!</div>
			</div>
		);
	}
}

These style modules adhere to SuitCSS naming convention:

.MyComponent {
	/* Styles */

	&-child {
		/* Styles */

		&.is-hidden {
			display: none;
		}
	}
}

All elements inside of a component should extend its parent class namespace, or create a new namespace (Potentially breaking that out into its own component.)

Variables and mixins can be imported from the files in common/styles:

@import "sass/colors";

code {
	color: $code-color;
}

Converting Styles

When working on a module that has styling in Less, try to do the following:

• Screenshot the component in question
• Create a new SCSS file in the same directory
• Remove styling from LESS file, convert it to the SCSS file (Mostly s/@/$)
• Convert class names to SuitCSS naming convention
• Convert any utility classes from etherewallet-utilities.less into mixins
• Convert as many element selectors to class name selectors as possible
• Convert as many <br/> tags or  s to margins
• Ensure that there has been little to no deviation from screenshot