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[Fresh] Set up infra for runtime and Babel plugin (#15698)
* Add a stub for React Fresh Babel plugin package * Move ReactFresh-test into ReactFresh top level directory * Add a stub for React Fresh Runtime entry point * Extract Fresh runtime from tests into its entry point
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‎packages/react-fresh/README.md

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# react-fresh
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This is an experimental package for hot reloading.
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**Its API is not as stable as that of React, React Native, or React DOM, and does not follow the common versioning scheme.**
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**Use it at your own risk.**

‎packages/react-fresh/babel.js

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/**
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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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'use strict';
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const ReactFreshBabelPlugin = require('./src/ReactFreshBabelPlugin');
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// This is hacky but makes it work with both Rollup and Jest.
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module.exports = ReactFreshBabelPlugin.default || ReactFreshBabelPlugin;

‎packages/react-fresh/npm/babel.js

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'use strict';
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if (process.env.NODE_ENV === 'production') {
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module.exports = require('./cjs/react-fresh-babel.production.min.js');
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} else {
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module.exports = require('./cjs/react-fresh-babel.development.js');
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}

‎packages/react-fresh/npm/runtime.js

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'use strict';
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if (process.env.NODE_ENV === 'production') {
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module.exports = require('./cjs/react-fresh-runtime.production.min.js');
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} else {
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module.exports = require('./cjs/react-fresh-runtime.development.js');
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}

‎packages/react-fresh/package.json

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{
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"name": "react-fresh",
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"private": true,
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"description": "React is a JavaScript library for building user interfaces.",
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"keywords": [
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"react"
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],
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"version": "0.1.0",
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"homepage": "https://reactjs.org/",
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"bugs": "https://github.com/facebook/react/issues",
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"license": "MIT",
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"files": [
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"LICENSE",
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"README.md",
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"babel.js",
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"runtime.js",
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"build-info.json",
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"cjs/",
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"umd/"
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],
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"main": "index.js",
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"repository": {
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"type": "git",
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"url": "https://github.com/facebook/react.git",
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"directory": "packages/react"
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},
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"engines": {
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"node": ">=0.10.0"
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}
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}

‎packages/react-fresh/runtime.js

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/**
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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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'use strict';
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const ReactFreshRuntime = require('./src/ReactFreshRuntime');
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// This is hacky but makes it work with both Rollup and Jest.
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module.exports = ReactFreshRuntime.default || ReactFreshRuntime;

‎packages/react-fresh/src/ReactFreshBabelPlugin.js

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/**
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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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'use strict';
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// TODO
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export default function(babel) {
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return {
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visitor: {},
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};
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}

‎packages/react-fresh/src/ReactFreshRuntime.js

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/**
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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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* @flow
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*/
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import type {
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Family,
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HotUpdate,
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} from 'react-reconciler/src/ReactFiberHotReloading';
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import {REACT_MEMO_TYPE, REACT_FORWARD_REF_TYPE} from 'shared/ReactSymbols';
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// We never remove these associations.
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// It's OK to reference families, but use WeakMap/Set for types.
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const allFamiliesByID: Map<string, Family> = new Map();
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const allTypes: WeakSet<any> = new WeakSet();
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const allSignaturesByType: WeakMap<any, string> = new WeakMap();
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// This WeakMap is read by React, so we only put families
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// that have actually been edited here. This keeps checks fast.
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const familiesByType: WeakMap<any, Family> = new WeakMap();
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// This is cleared on every prepareUpdate() call.
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// It is an array of [Family, NextType] tuples.
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let pendingUpdates: Array<[Family, any]> = [];
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export function prepareUpdate(): HotUpdate {
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const staleFamilies = new Set();
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const updatedFamilies = new Set();
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const updates = pendingUpdates;
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pendingUpdates = [];
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updates.forEach(([family, nextType]) => {
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// Now that we got a real edit, we can create associations
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// that will be read by the React reconciler.
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const prevType = family.current;
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familiesByType.set(prevType, family);
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familiesByType.set(nextType, family);
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family.current = nextType;
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// Determine whether this should be a re-render or a re-mount.
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const prevSignature = allSignaturesByType.get(prevType);
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const nextSignature = allSignaturesByType.get(nextType);
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if (prevSignature !== nextSignature) {
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staleFamilies.add(family);
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} else {
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updatedFamilies.add(family);
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}
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});
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return {
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familiesByType,
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updatedFamilies,
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staleFamilies,
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};
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}
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export function register(type: any, id: string): void {
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if (type === null) {
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return;
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}
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if (typeof type !== 'function' && typeof type !== 'object') {
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return;
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}
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// This can happen in an edge case, e.g. if we register
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// return value of a HOC but it returns a cached component.
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// Ignore anything but the first registration for each type.
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if (allTypes.has(type)) {
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return;
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}
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allTypes.add(type);
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// Create family or remember to update it.
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// None of this bookkeeping affects reconciliation
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// until the first prepareUpdate() call above.
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let family = allFamiliesByID.get(id);
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if (family === undefined) {
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family = {current: type};
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allFamiliesByID.set(id, family);
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} else {
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pendingUpdates.push([family, type]);
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}
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// Visit inner types because we might not have registered them.
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if (typeof type === 'object' && type !== null) {
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switch (type.$$typeof) {
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case REACT_FORWARD_REF_TYPE:
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register(type.render, id + '$render');
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break;
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case REACT_MEMO_TYPE:
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register(type.type, id + '$type');
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break;
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}
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}
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}
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export function setSignature(type: any, signature: string): void {
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allSignaturesByType.set(type, signature);
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}

‎packages/react-dom/src/__tests__/ReactFresh-test.internal.js renamed to ‎packages/react-fresh/src/__tests__/ReactFresh-test.js

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let React;
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let ReactDOM;
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let ReactFreshRuntime;
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let Scheduler;
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let act;
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let lastRoot;
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describe('ReactFresh', () => {
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let container;
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let familiesByID;
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let familiesByType;
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let newFamilies;
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let updatedFamilies;
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let performHotReload;
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let signaturesByType;
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let scheduleHotUpdate;
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beforeEach(() => {
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let scheduleHotUpdate;
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let lastRoot;
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global.__REACT_DEVTOOLS_GLOBAL_HOOK__ = {
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supportsFiber: true,
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inject: injected => {
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jest.resetModules();
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React = require('react');
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ReactDOM = require('react-dom');
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ReactFreshRuntime = require('react-fresh/runtime');
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Scheduler = require('scheduler');
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act = require('react-dom/test-utils').act;
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container = document.createElement('div');
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document.body.appendChild(container);
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familiesByID = new Map();
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familiesByType = new WeakMap();
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if (__DEV__) {
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performHotReload = function(staleFamilies) {
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scheduleHotUpdate({
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root: lastRoot,
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familiesByType,
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updatedFamilies,
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staleFamilies,
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});
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};
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}
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});
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afterEach(() => {
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document.body.removeChild(container);
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});
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function prepare(version) {
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newFamilies = new Set();
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updatedFamilies = new Set();
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signaturesByType = new Map();
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const Component = version();
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// Fill in the signatures.
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for (let family of newFamilies) {
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const latestSignature = signaturesByType.get(family.currentType) || null;
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family.currentSignature = latestSignature;
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}
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newFamilies = null;
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updatedFamilies = null;
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signaturesByType = null;
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return Component;
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}
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function render(version, props) {
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const Component = prepare(version);
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const Component = version();
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act(() => {
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ReactDOM.render(<Component {...props} />, container);
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});
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return Component;
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}
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function patch(version) {
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// Will be filled in by __register__ calls in user code.
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newFamilies = new Set();
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updatedFamilies = new Set();
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signaturesByType = new Map();
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const Component = version();
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// Fill in the signatures.
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for (let family of newFamilies) {
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const latestSignature = signaturesByType.get(family.currentType) || null;
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family.currentSignature = latestSignature;
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}
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// Now that all registration and signatures are collected,
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// find which registrations changed their signatures since last time.
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const staleFamilies = new Set();
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for (let family of updatedFamilies) {
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const latestSignature = signaturesByType.get(family.currentType) || null;
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if (family.currentSignature !== latestSignature) {
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family.currentSignature = latestSignature;
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staleFamilies.add(family);
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}
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}
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performHotReload(staleFamilies);
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newFamilies = null;
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updatedFamilies = null;
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signaturesByType = null;
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const hotUpdate = ReactFreshRuntime.prepareUpdate();
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scheduleHotUpdate(lastRoot, hotUpdate);
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return Component;
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}
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function __register__(type, id) {
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if (familiesByType.has(type)) {
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return;
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}
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let family = familiesByID.get(id);
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let isNew = false;
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if (family === undefined) {
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isNew = true;
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family = {currentType: type, currentSignature: null};
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familiesByID.set(id, family);
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}
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const prevType = family.currentType;
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if (isNew) {
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// The first time a type is registered, we don't need
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// any special reconciliation logic. So we won't add it to the map.
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// Instead, this will happen the firt time it is edited.
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newFamilies.add(family);
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} else {
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family.currentType = type;
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// Point both previous and next types to this family.
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familiesByType.set(prevType, family);
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familiesByType.set(type, family);
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updatedFamilies.add(family);
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}
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if (typeof type === 'object' && type !== null) {
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switch (type.$$typeof) {
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case Symbol.for('react.forward_ref'):
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__register__(type.render, id + '$render');
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break;
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case Symbol.for('react.memo'):
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__register__(type.type, id + '$type');
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break;
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}
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}
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ReactFreshRuntime.register(type, id);
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}
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function __signature__(type, signature) {
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signaturesByType.set(type, signature);
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function __signature__(type, id) {
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ReactFreshRuntime.setSignature(type, id);
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}
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it('can preserve state for compatible types', () => {

‎packages/react-fresh/src/__tests__/ReactFreshBabelPlugin-test.js

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/**
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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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'use strict';
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let babel = require('babel-core');
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let freshPlugin = require('react-fresh/babel');
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function transform(input, options = {}) {
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return babel.transform(input, {
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plugins: [[freshPlugin]],
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}).code;
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}
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describe('ReactFreshBabelPlugin', () => {
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it('hello world', () => {
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expect(transform(`hello()`)).toMatchSnapshot();
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});
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});

‎packages/react-fresh/src/__tests__/__snapshots__/ReactFreshBabelPlugin-test.js.snap

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// Jest Snapshot v1, https://goo.gl/fbAQLP
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exports[`ReactFreshBabelPlugin hello world 1`] = `"hello();"`;

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