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Writing Code for Your Apollo Universal Starter Kit Project

Configuring Your IDE or a Text Editor

We strongly recommend that you enable ESLint and TSLint in your text editor or an Integrated Development Environment. ESLint and TSLint will help you improve the quality of your JavaScript and TypeScript code and avoid various pitfalls.

Writing the Code

The starter kit provides full support for modules written in JavaScript (both ES6- and ES7-styles) and TypeScript. You can freely mix the languages and write modules (and even parts of modules) in ES6, ES7, and TypeScript at the same time.

When writing TypeScript modules, however, you may face various pitfalls. A general discussion about TypeScript pitfalls will be handled in the Apollo Universal Starter Kit issues section. The recipes from discussion will be added into the Recipes for Common TypeScript Pitfalls section.

Recipes for Common TypeScript Pitfalls

  • TypeScript has limited support for the code in files with custom extensions.

Because of the problem above, all the files with code written for the web platform should have the .ts extension, not .web.ts, to let the TypeScript compiler find the file. And if the same file contains different implementations for the Android and iOS platforms, this file should have the extension .native.ts.

In JavaScript, when you import somefile, you typically avoid including the platform-specific extensions. Put simply, you don't need to to write import { SomeClass } from 'somefile.native', because the extension is automatically determined at the compile time.

With TypeScript, however, the situation is different, as somefile and somefile.native.ts might export different interfaces, which is why you have to import modules this way import { Some Class } from 'somefile.native'.

  • locales/index.js must be kept in JavaScript for now. If you rename this file to use the .ts extension, you'll run into incompatibilities between @alienfast/i18next-loader and the TypeScript compiler. You can fix this issue by making changes to @alienfast/i18next-loader.

  • When using a stateless JSX component written in JavaScript from within the TypeScript code, you can get the error TS2322 missing key, despite the fact that the key in question is declared optional. The workaround is to convert this stateless component into a stateful JSX component.

  • TSLint complains that a module is missing, though the module is presented in peerDependencies.

TSLint checks dependencies and either peerDependencies or devDependencies, not both! This is why TSLint may complain that a module is missing. For Apollo Universal Starter Kit, we've configured TSLint to look into dependencies, devDependencies, and optionalDependencies when resolving modules.

You can work around this issue by switching from using peerDependencies in package.json to optionalDependencies. This way both ESLint and TSLint will find all required modules.

Naming Convention

We recommend that you stick to the following convention when naming the files for different platforms:

MyComponent.jsx            // for the client-side app
MyComponent.native.jsx     // for the mobile app
MyComponent.android.jsx    // for the Android app
MyComponent.ios.jsx        // for the iOS app

Notice that you can use three extensions for the mobile platform – .native.jsx, .android.jsx, and ios.jsx. You should use .native.jsx when the logic written in the file is related to both Android and iOS platforms. If you need to write custom logic for Android or iOS, use .android.jsx or .ios.jsx extensions respectively.