/** Alias for a value that might come in a Promise. */
export type Awaitable<T> = T | Promise<T>

/** String that has been decrypted. */
export type DecodedValue = string

/** String that has been encrypted. */
export type EncodedValue = string

/** A key used for encryption. */
export type KeyValue = string

/**
 * Interface that designates a particular value as able to be constructed.
 */
export interface Instantiable<T> {
    new(...args: any[]): T
}

/**
 * Returns true if the given value is instantiable.
 * @param what
 */
export function isInstantiable<T>(what: unknown): what is Instantiable<T> {
    return (
        Boolean(what)
        && (typeof what === 'object' || typeof what === 'function')
        && (what !== null)
        && 'constructor' in what
        && typeof what.constructor === 'function'
    )
}

/**
 * Serialized payload of a given value.
 */
export type EncodedPayload<T> = string

/**
 * Determines that a given item is a valid serialized payload.
 * @param what
 */
export function isEncodedPayload(what: unknown): what is EncodedPayload<unknown> {
    if ( typeof what !== 'string' ) {
        return false
    }

    return what.startsWith('multicrypt:')
}