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NativeScript Core

Build Process

The code-sharing project comes with a build process that is capable of using the shared files together with the platform-specific ones, and providing a web or mobile app as a result. Here’s what that looks like at a high level.

build-process

Web Build

To build a web app, it is business as usual — just use the Angular CLI to do the job. When you call ng serve or ng build, the Angular CLI will ignore all NativeScript-specific files, as none of the web files directly reference any .tns files.

ng serve -o -> builds a web app from the code-sharing project and opens it in default browser

Mobile Build

In order to build an iOS or an Android app with NativeScript, you need to use the NativeScript CLI with the nativescript-dev-webpack plugin.

To build a mobile app from a code-sharing project run:

tns run ios --bundle
tns run android --bundle

NOTE: The --bundle flag notifies the NativeScript CLI to use Webpack to build a mobile app from the code-sharing project. Webpack is a hard dependency for code-sharing projects, and you must use this flag for your project to run successfully.

Behind the scenes

The build process consists of two major steps: bundling and building the native app.

For bundling, the nativescript-dev-webpack plugin prepares the project in a Virtual File System. The VFS is used to provide NativeScript-specific files.

Every time a file is requested from the File System, like this import statement:

import { MyComponent } from './my/my.component';

Webpack checks the VFS for the .tns file first (in this case my.component.tns.ts), and serves the NativeScript-specific file. If the VFS does not find a NativeScript-specific file, it provides the shared file instead.

This virtually replaces web files with NativeScript files.

Finally, the NativeScript build process takes the bundled image of the project and completes the build with Native Build Tools (Xcode for iOS and Gradle for Android), and as a result produces a native mobile app.