Variable Either

Type declaration

• ap: <L extends unknown, R extends unknown, U extends unknown>(
      eitherF: Either<L, (value: R) => U>,
      eitherV: Either<L, R>,
  ) => Either<L, U>

• fromNullable: <L extends unknown, R extends unknown>(
      value: undefined | null | R,
      leftValue: L,
  ) => Either<L, R>

• fromPredicate: <L extends unknown, R extends unknown>(
      value: R,
      predicate: (value: R) => boolean,
      leftValue: L,
  ) => Either<L, R>

• fromPromise: <L, R>(
      promise: Promise<R>,
      onRejected: (reason: unknown) => L,
  ) => Promise<Either<L, R>>

• sequence: <L extends unknown, R extends unknown>(
      eithers: Either<L, R>[],
  ) => Either<L, R[]>

• traverse: <L extends unknown, R extends unknown, U extends unknown>(
      arr: R[],
      f: (value: R) => Either<L, U>,
  ) => Either<L, U[]>