@nozbe/watermelondb/utils/fp/Result/index.js

Build powerful React Native and React web apps that scale from hundreds to tens of thousands of records and remain fast

"use strict";

exports.__esModule = true;
exports.fromPromise = fromPromise;
exports.mapValue = mapValue;
exports.toPromise = toPromise;
// lightweight type-only Result (Success(T) | Error) monad
function toPromise(withCallback) {
  return new Promise(function (resolve, reject) {
    withCallback(function (result) {
      if (result.error) {
        reject(result.error);
      }

      // $FlowFixMe - yes, you do have a value
      resolve(result.value);
    });
  });
}
function fromPromise(promise, callback) {
  promise.then(function (value) {
    return callback({
      value: value
    });
  }, function (error) {
    return callback({
      error: error
    });
  });
}
function mapValue(mapper, result) {
  if (result.error) {
    return result;
  }
  try {
    return {
      value: mapper(result.value)
    };
  } catch (error) {
    return {
      error: error
    };
  }
}