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FastRefreshDevToolsIntegration-test.js
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FastRefreshDevToolsIntegration-test.js
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/**
* 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.
*
* @flow
*/
describe('Fast Refresh', () => {
let React;
let ReactDOM;
let ReactFreshRuntime;
let act;
let babel;
let container;
let exportsObj;
let freshPlugin;
let store;
let withErrorsOrWarningsIgnored;
afterEach(() => {
jest.resetModules();
});
beforeEach(() => {
exportsObj = undefined;
container = document.createElement('div');
babel = require('@babel/core');
freshPlugin = require('react-refresh/babel');
store = global.store;
React = require('react');
ReactFreshRuntime = require('react-refresh/runtime');
ReactFreshRuntime.injectIntoGlobalHook(global);
ReactDOM = require('react-dom');
const utils = require('./utils');
act = utils.act;
withErrorsOrWarningsIgnored = utils.withErrorsOrWarningsIgnored;
});
function execute(source) {
const compiled = babel.transform(source, {
babelrc: false,
presets: ['@babel/react'],
plugins: [
[freshPlugin, {skipEnvCheck: true}],
'@babel/plugin-transform-modules-commonjs',
'@babel/plugin-transform-destructuring',
].filter(Boolean),
}).code;
exportsObj = {};
// eslint-disable-next-line no-new-func
new Function(
'global',
'React',
'exports',
'$RefreshReg$',
'$RefreshSig$',
compiled,
)(global, React, exportsObj, $RefreshReg$, $RefreshSig$);
// Module systems will register exports as a fallback.
// This is useful for cases when e.g. a class is exported,
// and we don't want to propagate the update beyond this module.
$RefreshReg$(exportsObj.default, 'exports.default');
return exportsObj.default;
}
function render(source) {
const Component = execute(source);
act(() => {
ReactDOM.render(<Component />, container);
});
// Module initialization shouldn't be counted as a hot update.
expect(ReactFreshRuntime.performReactRefresh()).toBe(null);
}
function patch(source) {
const prevExports = exportsObj;
execute(source);
const nextExports = exportsObj;
// Check if exported families have changed.
// (In a real module system we'd do this for *all* exports.)
// For example, this can happen if you convert a class to a function.
// Or if you wrap something in a HOC.
const didExportsChange =
ReactFreshRuntime.getFamilyByType(prevExports.default) !==
ReactFreshRuntime.getFamilyByType(nextExports.default);
if (didExportsChange) {
// In a real module system, we would propagate such updates upwards,
// and re-execute modules that imported this one. (Just like if we edited them.)
// This makes adding/removing/renaming exports re-render references to them.
// Here, we'll just force a re-render using the newer type to emulate this.
const NextComponent = nextExports.default;
act(() => {
ReactDOM.render(<NextComponent />, container);
});
}
act(() => {
const result = ReactFreshRuntime.performReactRefresh();
if (!didExportsChange) {
// Normally we expect that some components got updated in our tests.
expect(result).not.toBe(null);
} else {
// However, we have tests where we convert functions to classes,
// and in those cases it's expected nothing would get updated.
// (Instead, the export change branch above would take care of it.)
}
});
expect(ReactFreshRuntime._getMountedRootCount()).toBe(1);
}
function $RefreshReg$(type, id) {
ReactFreshRuntime.register(type, id);
}
function $RefreshSig$() {
return ReactFreshRuntime.createSignatureFunctionForTransform();
}
it('should not break the DevTools store', () => {
render(`
function Parent() {
return <Child key="A" />;
};
function Child() {
return null;
};
export default Parent;
`);
expect(store).toMatchInlineSnapshot(`
[root]
▾ <Parent>
<Child key="A">
`);
patch(`
function Parent() {
return <Child key="B" />;
};
function Child() {
return null;
};
export default Parent;
`);
expect(store).toMatchInlineSnapshot(`
[root]
▾ <Parent>
<Child key="B">
`);
});
it('should not break when there are warnings in between patching', () => {
withErrorsOrWarningsIgnored(['Expected warning during render'], () => {
render(`
const {useState} = React;
export default function Component() {
const [state, setState] = useState(1);
console.warn("Expected warning during render");
return <div />;
}
`);
});
expect(store).toMatchInlineSnapshot(`
✕ 0, ⚠ 1
[root]
<Component> ⚠
`);
let element = container.firstChild;
withErrorsOrWarningsIgnored(['Expected warning during render'], () => {
patch(`
const {useState} = React;
export default function Component() {
const [state, setState] = useState(1);
console.warn("Expected warning during render");
return <div id="one" />;
}
`);
});
expect(store).toMatchInlineSnapshot(`
✕ 0, ⚠ 2
[root]
<Component> ⚠
`);
// State is preserved; this verifies that Fast Refresh is wired up.
expect(container.firstChild).toBe(element);
element = container.firstChild;
withErrorsOrWarningsIgnored(['Expected warning during render'], () => {
patch(`
const {useEffect, useState} = React;
export default function Component() {
const [state, setState] = useState(3);
useEffect(() => {});
console.warn("Expected warning during render");
return <div id="one" />;
}
`);
});
expect(store).toMatchInlineSnapshot(`
✕ 0, ⚠ 1
[root]
<Component> ⚠
`);
// State is reset because hooks changed.
expect(container.firstChild).not.toBe(element);
element = container.firstChild;
withErrorsOrWarningsIgnored(['Expected warning during render'], () => {
patch(`
const {useState} = React;
export default function Component() {
const [state, setState] = useState(4);
console.warn("Expected warning during render");
return <div id="one" />;
}
`);
});
expect(store).toMatchInlineSnapshot(`
✕ 0, ⚠ 1
[root]
<Component> ⚠
`);
// State is reset because hooks changed.
expect(container.firstChild).not.toBe(element);
});
});