froebel/isPromise.mjs

TypeScript utility library

/** Checks if `value` looks like a promise. */
const isPromise = value => typeof value === "object" && value !== null && typeof value.then === "function";

export default isPromise;
/**
 * Checks if `value` is not a promise.
 *
 * @example
 * ```
 * (value: number | Promise<unknown>) => {
 *   if (isNotPromise(value)) return value / 2
 * }
 * ```
 */

export const isNotPromise = value => !isPromise(value);