A default export is the single main value a module exposes.

Default Export Function

default_export.ts
export default function titleCase(text: string): string {
    return text
        .split(" ")
        .map((word) => word[0].toUpperCase() + word.slice(1))
        .join(" ");
}

const rawTitle: string = ;
const title: string = titleCase(rawTitle);

console.log(title);
export default function titleCase(text: string): string {
    return text
        .split(" ")
        .map((word) => word[0].toUpperCase() + word.slice(1))
        .join(" ");
}

const rawTitle: string = ;
const title: string = titleCase(rawTitle);

console.log(title);
default export `export default` marks one declaration as the primary export of the module.