Assuming I have a query parameter from the router in my Next.js app
const {
query: { id },
} = useRouter();
The value of { id } is currently string | string[] | undefined.
I want to send it as a parameter to another function, and I am certain that it will be a string when the function requiring id is called.
Is there a way to ensure that id is treated as a string during destructuring?
It appears the query is about utilizing a type assertion with a destructuring assignment.
If that's accurate, the assertion should come after the expression value on the right side. Here's what you have in your question:
Your current code:
import { useRouter, type NextRouter } from 'next/router';
const { query: { id } } = useRouter();
//^? const id: string | string[] | undefined
Here's how to apply the type assertion:
import { useRouter, type NextRouter } from 'next/router';
const { query: { id } } = useRouter() as NextRouter & { query: { id: string } };
//^? const id: string
Instead of assuming and asserting, it's advisable to perform runtime checks:
import { useRouter } from 'next/router';
const { query: { id } } = useRouter();
//^? const id: string | string[] | undefined
if (typeof id === 'string') {
// Now you can be confident that it's really a string.
// Perform operations with the string here.
id;
//^? const id: string
}
else {
// It could be an array or undefined.
// Handle this scenario accordingly.
id;
//^? const id: string[] | undefined
}
For further reference, check out Using type predicates in the TS handbook
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