minimal-either

Minimal Either implementation in Typescript. To know more, see Vavr Either

Remember -- Right is right

Usage

import { Either } from 'minimal-either'

function myEitherFunction(): Either<Error, Response> {
  try {
    const response = ...
    return Either.makeRight(response);
  } catch (error) {
    return Either.makeLeft(new Error('My custom error message'));
  }
}

function parentOfEitherFunction(): Either<Error, null> {
    const responseEither = myEitherFunction();

    if (responseEither.isLeft()) {
        // Handle errors
        const errorObject = responseEither.getLeft();

        // Or bubble up
        return responseEither;
    }

    // Get the original value from the right
    const response = responseEither.getRight();
    return Either.makeRight(null);
}