I'm facing the challenge of transferring certain props into my component.
type Props = {
icon: number,
onChangeText: Function,
onEndEditing: Function,
placeholder: string,
secureTextEntry?: boolean
};
export default function LRInput(
props: Props = { ...props, secureTextEntry: false } // I attempted this approach but it didn't work
) { /*function body*/ }As you can see, secureTextEntry is an optional parameter. How can I set a default value for this prop?
Instead of employing destructuring, my preference would be to assign the optional property to a fresh object:
export default function LRInput(props: Props) {
const defaultedProps: Props = { secureTextEntry: false, ...props };
/* code within the function */
}
It is necessary to handle destructuring while performing this task, whether it be seen as unfortunate or fortunate.
type Props = {
icon: number,
onChangeText: Function,
onEndEditing: Function,
placeholder: string,
secureTextEntry?: boolean
};
function LRInput(
{ secureTextEntry = false, ...props }: Props
) { console.log(secureTextEntry) }
LRInput({ icon: 5 })
LRInput({ icon: 5, secureTextEntry: true })Edit
In response to your concern about the default value appearing after the rest of the props, when targeting es5 in typescript, there should not be an issue because the rest syntax is transpiled accordingly as shown below,
function LRInput(_a) {
var _b = _a.secureTextEntry;
var secureTextEntry = _b === void 0 ? false : _b;
/* code to handle rest omitted */
console.log(secureTextEntry);
}
It is evident that with this transformation, the order of spread does not affect functionality. However, for logical coherence, ES2018 standard and Typescript dictate placing the "rest" parameter after the destructured keys
{ secureTextEntry = false, ...rest }(My oversight initially occurred due to editing the code which executed without error on this site's typescript compiler set to emit despite detecting errors. Since I did not utilize ...props within the function, the issue with rest parameter transformation went unnoticed. You can witness the transpilation process here for yourself.)
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