app_expo/theme/typography.ts


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import { Platform } from 'react-native'

/**
 * You can find a list of available fonts on both iOS and Android here:
 * https://github.com/react-native-training/react-native-fonts
 *
 * If you're interested in adding a custom font to your project,
 * check out the readme file in ./assets/fonts/ then come back here
 * and enter your new font name. Remember the Android font name
 * is probably different than iOS.
 * More on that here:
 * https://github.com/lendup/react-native-cross-platform-text
 *
 * The various styles of fonts are defined in the <Text /> component.
 */
export const typography = {
  /**
   * The primary font.  Used in most places.
   */
  primary: Platform.select({ ios: 'Helvetica', android: 'normal' }),

  /**
   * An alternate font used for perhaps titles and stuff.
   */
  secondary: Platform.select({ ios: 'Arial', android: 'sans-serif' }),

  /**
   * Lets get fancy with a monospace font!
   */
  code: Platform.select({ ios: 'Courier', android: 'monospace' }),
}