Function makePrettyError

packages/effect/src/internal/cause.ts:899–934

(originalError: unknown)

/** @internal */
export const makePrettyError = (originalError: unknown): Cause.PrettyError => {
  const originalErrorIsObject = typeof originalError === "object" && originalError !== null
  const prevLimit = Error.stackTraceLimit
  Error.stackTraceLimit = 1
  const error = new Error(
    prettyErrorMessage(originalError),
    originalErrorIsObject && "cause" in originalError && typeof originalError.cause !== "undefined"
      ? { cause: makePrettyError(originalError.cause) }
      : undefined
  ) as Types.Mutable<Cause.PrettyError>
  Error.stackTraceLimit = prevLimit
  if (error.message === "") {
    error.message = "An error has occurred"
  }
  Error.stackTraceLimit = prevLimit
  error.name = originalError instanceof Error ? originalError.name : "Error"
  if (originalErrorIsObject) {
    if (spanSymbol in originalError) {
      error.span = originalError[spanSymbol] as Span
    }
    Object.keys(originalError).forEach((key) => {
      if (!(key in error)) {
        // @ts-expect-error
        error[key] = originalError[key]
      }
    })
  }
  error.stack = prettyErrorStack(
    `${error.name}: ${error.message}`,
    originalError instanceof Error && originalError.stack
      ? originalError.stack
      : "",
    error.span
  )
  return error
}

/**
 * A utility function for generating human-readable error messages from a generic error of type `unknown`.