WIP Add support for mocking files

[ceceppa]

Description

This PR sets the OWL_BUILD environment variable when building the app using the owl:build:* process.
The variable can be used to configure the metro.config.js file to change the priority of the file extensions. For example in the example app:

if (process.env.OWL_BUILD) { resolver.sourceExts = [ 'owl.ts', 'owl.tsx', 'owl.js', 'owl.jsx', 'ts', 'tsx', 'js', 'jsx', ]; } 

it allows the app to load mock components with the extension .owl.ts*.
Besides allowing mock components/data for testing only, it guarantees that no test code ends up by mistake in the production app.

Type of Change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

The example app renders the App Button when launched via yarn start and Owl Button when launched with owl:test:*

Checklist:

• Add support for communication between mocks and test
• Add support for Android build
• Update documentation
• Better example

Screenshots (for visual changes):

[robwalkerco]

@ceceppa Once #151 is merged, it would be great for this PR to be continued :)

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Name	Status	Preview	Comments	Updated (UTC)
react-native-owl	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 7, 2023 9:47am