@effect-ts/system/_src/Sync/isFailure.ts

Effect-TS is a zero dependency set of libraries to write highly productive, purely functional TypeScript at scale.

// ets_tracing: off

import type { Sync } from "./core.js"
import { fold_ } from "./core.js"

/**
 * Returns whether this effect is a failure.
 */
export function isFailure<R, E, A>(self: Sync<R, E, A>) {
  return fold_(
    self,
    () => true,
    () => false
  )
}