recoil/cjs/hooks/__tests__/Recoil_useTransaction-test.js.flow

Recoil - A state management library for React

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @emails oncall+recoil
 * @flow strict-local
 * @format
 */
'use strict';

const {
  getRecoilTestFn
} = require('../../__test_utils__/Recoil_TestingUtils');

let React, atom, useRecoilValue, useRecoilTransaction, renderElements;
const testRecoil = getRecoilTestFn(() => {
  React = require('react');
  ({
    atom,
    useRecoilTransaction_UNSTABLE: useRecoilTransaction,
    useRecoilValue
  } = require('../../Recoil_index'));
  ({
    renderElements
  } = require('../../__test_utils__/Recoil_TestingUtils'));
});
testRecoil('Atom effects are initialized once if first seen on transaction and then on root store', () => {
  let numTimesEffectInit = 0;
  const atomWithEffect = atom({
    key: 'atomWithEffect',
    default: 0,
    effects_UNSTABLE: [() => {
      numTimesEffectInit++;
    }]
  });
  declare var Component: () => any;
  renderElements(<Component />);
  expect(numTimesEffectInit).toBe(1);
});
testRecoil('Atom effects are initialized once if first seen on root store and then on snapshot', () => {
  let numTimesEffectInit = 0;
  const atomWithEffect = atom({
    key: 'atomWithEffect2',
    default: 0,
    effects_UNSTABLE: [() => {
      numTimesEffectInit++;
    }]
  });
  declare var Component: () => any;
  renderElements(<Component />);
  expect(numTimesEffectInit).toBe(1);
});