This is the code.
function inspect(item: { label: string } | {}) {
if (item.label) { //error
console.log("inspect jingo");
}
}The error I receive says The property "label" does not exist in the type "{} | {label: string;}".The property "label" does not exist in the type "{}".
I'm a typescript beginner. How can I declare that item accepts either an empty object or {label: string}.
Make the label property optional by adding ?:
function inspect(item: { label?: string }) {
if (item.label) {
console.log("inspect jingo");
}
}I'm unsure whether TypeScript considers this a good approach, but inside your if condition you can explicitly assert that item has the type { label: string }:
function inspect(item: { label: string } | {}) {
if ((item as {label: string}).label) {
console.log("inspect jingo");
}
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