How to specify (optional) default props with TypeScript for stateless, functional React components?

javascript, react-native, reactjs, typescript

Solution

Here's a similar question with an answer: React with TypeScript - define defaultProps in stateless function

import React, { Component } from 'react';
import { Text } from 'react-native';

interface TestProps {
    title?: string,
    name?: string
}

const defaultProps: TestProps = {
    title: 'Mr',
    name: 'McGee'
}

const Test: React.SFC<TestProps> = (props) => (
    <Text>
        {props.title} {props.name}
    </Text>
);

Test.defaultProps = defaultProps;

export default Test;

Problem

I'm trying to create a stateless React component with optional props and defaultProps in Typescript (for a React Native project). This is trivial with vanilla JS, but I'm stumped as to how to achieve it in TypeScript. With the following code: ``` import React, { Component } from 'react'; import { Text } from 'react-native'; interface TestProps { title?: string, name?: string } const defaultProps: TestProps = { title: 'Mr', name: 'McGee' } const Test = (props = defaultProps) => ( <Text> {props.title} {props.name} </Text> ); export default Test; ``` Calling `<Test title="Sir" name="Lancelot" />` renders "Sir Lancelot" as expected, but `<Test />` results in nothing, when it should output "Mr McGee". Any help is greatly appreciated.

Original source

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