mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Tim Yung
54a067e61e
Summary: Rewrites `splitLayoutProps`, which is only used by `ScrollView`. - Improve type safety by avoiding `DangerouslyImpreciseStyle`. - Avoid allocating objects when it is not necessary. - Avoid allocating a object enumeratig layout props by using a switch statement. Changelog: [Internal] Reviewed By: JoshuaGross, kacieb Differential Revision: D25097226 fbshipit-source-id: 2050c03b681024212c06a48b7eb05f28c14415f9
54 lines
1.2 KiB
JavaScript
54 lines
1.2 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @emails oncall+react_native
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*/
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'use strict';
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const splitLayoutProps = require('../splitLayoutProps').default;
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test('splits style objects', () => {
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const style = {width: 10, margin: 20, padding: 30, transform: {scaleY: -1}};
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const {outer, inner} = splitLayoutProps(style);
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expect(outer).toMatchInlineSnapshot(`
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Object {
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"margin": 20,
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"transform": Object {
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"scaleY": -1,
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},
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"width": 10,
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}
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`);
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expect(inner).toMatchInlineSnapshot(`
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Object {
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"padding": 30,
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}
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`);
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});
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test('does not copy values to both returned objects', () => {
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const style = {marginVertical: 5, paddingHorizontal: 10};
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const {outer, inner} = splitLayoutProps(style);
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expect(outer).toMatchInlineSnapshot(`
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Object {
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"marginVertical": 5,
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}
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`);
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expect(inner).toMatchInlineSnapshot(`
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Object {
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"paddingHorizontal": 10,
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}
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`);
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});
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test('returns null values if argument is null', () => {
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const {outer, inner} = splitLayoutProps(null);
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expect(outer).toBe(null);
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expect(inner).toBe(null);
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});
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