Extend default font styles doesn't work

Is there an existing issue for this?

• I have searched the existing issues

Explain what you did

I’ve tried to extend the default font styles with interface merging as documentation explain:

import 'react-native-elements';
import { ColorValue, StyleProp, TextStyle } from 'react-native';

type ColorSwatch = {
  otherColor: string;
};

declare module 'react-native-elements' {
  export interface Colors extends ColorSwatch {}

  export interface TextProps {
    h5Style: StyleProp<TextStyle>;
  }

  export interface FullTheme {
    colors: RecursivePartial<Colors>;
    Text: Partial<TextProps>;
  }
}

Expected behavior

The expected behavior should be can access to the new styles inside theme object:

import { FullTheme } from 'react-native-elements';

export const theme: FullTheme = {
  Text: {
    h5Style: {
      fontFamily: '',
    },
  }
}

Describe the bug

When I create the module with interface augmentatino I’m getting the following error:

Object literal may only specify known properties, but 'h5Style' does not exist in type 'Partial<TextProps>'. Did you mean to write 'h1Style'?

Steps To Reproduce

Just create a repo with react-native-elements and follow the doumentation in how extend default theme types, an try to create a new ones for font styles,s that's all you need to reproduce the error.

### react-native-elements.d.ts


import 'react-native-elements';
import { ColorValue, StyleProp, TextStyle } from 'react-native';

type ColorSwatch = {
  otherColor: string;
};

declare module 'react-native-elements' {
  export interface Colors extends ColorSwatch {}

  export interface TextProps {
    h5Style: StyleProp<TextStyle>;
  }

  export interface FullTheme {
    colors: RecursivePartial<Colors>;
    Text: Partial<TextProps>;
  }
}

Screenshots

Your Environment

"react-native-elements": "^3.4.2",
"react-native": "0.67.2",

[arpitBhalla]

Yeah, I have already created a PR https://github.com/react-native-elements/react-native-elements/pull/3324

[arpitBhalla]

@monk-lee I am working on that part.