Function unwrap

shared/assert.ts:75–80

(x: T | undefined | null, message?: string, ...extra_info: any[])

}

export function unwrap<T>(x: T | undefined | null, message?: string, ...extra_info: any[]): T {
    if (x === undefined || x === null) {
        fail('Unwrap failed', message, extra_info);
    }
    return x;
}

// This mainly a utility for JQuery.val(): string | number | string[] | undefined, in our code we typically want a
// single string.