typed-utilities/build/Either.js

Strongly typed general purpose utilities

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.Either = void 0;
var EitherTag;

(function (EitherTag) {
  EitherTag["Left"] = "left";
  EitherTag["Right"] = "right";
})(EitherTag || (EitherTag = {}));

function isLeft(either) {
  return either[0] === EitherTag.Left;
}

function assertLeft(either, message) {
  if (!isLeft(either)) {
    throw new TypeError(message ?? `either should be 'left'`);
  }
}

function isRight(either) {
  return either[0] === EitherTag.Right;
}

function assertRight(either, message) {
  if (!isRight(either)) {
    throw new TypeError(message ?? `either should be 'right'`);
  }
}

const toLeftValue = either => either[1];

const toRightValue = either => either[1];

const is = {
  left: isLeft,
  right: isRight
};
const to = {
  leftValue: toLeftValue,
  rightValue: toRightValue
};
const assert = {
  left: assertLeft,
  right: assertRight
};
const of = {
  left: value => [EitherTag.Left, value],
  right: value => [EitherTag.Right, value]
};

const match = (either, match) => isLeft(either) ? match.left(either[1]) : match.right(either[1]);

const Either = {
  is,
  to,
  assert,
  of,
  match
};
exports.Either = Either;
//# sourceMappingURL=Either.js.map