TypeScript Color Definitions in React Native

I'm working on a component that requires users to pass only valid color values using TypeScript type checking in a React Native project. How can I achieve this and which types should I use?

const TextBody = ({
  color
}: {color: //Need This}) => {
  return (
    <Text
      style={[
        generalStyles,
        textTransformStyle,
        textAlignStyle,
        selfAlignmentStyle,
        typography?.body,
        style,
      ]}
    >
      {children}
    </Text>
  );
};

export { TextBody };

Users can pass colors like:

<TextBody color="red"/>
<TextBody color="#21292F"/>
<TextBody color={rgba(12,2,1,0)}/>

This should result in an error:

<TextBody color={5252}/>

Answer №1

Apologies for the delay, I have found a solution to the issue.

To ensure type safety for valid color values in a React Native component with TypeScript, you can utilize the ColorValue type provided by React Native. This type signifies a legitimate color value that can be utilized in styles.

Below is an example implementation for a TextBody component:

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

interface TextBodyProps {
  color: ColorValue;
}

const TextBody: React.FC<TextBodyProps> = ({ color, children }) => {
  const textStyles: TextStyle[] = [
    generalStyles,
    textTransformStyle,
    textAlignStyle,
    selfAlignmentStyle,
    typography?.body,
    style,
  ];

  return (
    <Text style={[...textStyles, { color }]}>
      {children}
    </Text>
  );
};

export { TextBody };

In this case, the interface TextBodyProps includes a color property of type ColorValue, which denotes a valid color value for React Native styles.

Users are now able to provide valid color values as props, like color names, hex codes, and RGBA values, as illustrated in the examples below:

<TextBody color="red" />
<TextBody color="#21292F" />
<TextBody color="rgba(12, 2, 1, 0)" />

If a user attempts to pass an invalid color value, such as a number (5252 in the example below), TypeScript will raise a type error:

<TextBody color={5252} /> // Throws a type error

Ensure that your project has the necessary TypeScript and React Native configurations in place to enable type checking.

By leveraging the ColorValue type, you can enforce type checking and guarantee that only valid color values are supplied to your React Native components.

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