@dillonkearns/elm-graphql/examples/src/subscription/node_modules/flow-static-land/lib/Exception.js

<img src="https://cdn.jsdelivr.net/gh/martimatix/logo-graphqelm/logo.svg" alt="dillonearns/elm-graphql logo" width="40%" align="right">

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.EXCEPTION = undefined;
exports.error = error;
exports.throwException = throwException;
exports.catchException = catchException;
exports.tryEff = tryEff;

var _Eff = require('./Eff');

var _Either = require('./Either');

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

// This effect is used to annotate code which possibly throws exceptions
var EXCEPTION = exports.EXCEPTION = function EXCEPTION() {
  _classCallCheck(this, EXCEPTION);
};

function error(message) {
  return new Error(message);
}

// Throw an exception
function throwException(e) {
  return (0, _Eff.inj)(function () {
    throw e;
  });
}

// Catch an exception by providing an exception handler
function catchException(handler, eff) {
  return (0, _Eff.inj)(function () {
    try {
      return (0, _Eff.runEff)(eff);
    } catch (e) {
      return (0, _Eff.runEff)(handler(e));
    }
  });
}

// Runs an Eff and returns eventual Exceptions as a `Left` value. If the
// computation succeeds the result gets wrapped in a `Right`.
function tryEff(eff) {
  var handler = function handler(e) {
    return (0, _Eff.of)((0, _Either.left)(e));
  };
  return catchException(handler, (0, _Eff.map)(_Either.right, eff));
}