mirror of
https://github.com/zebrajr/react.git
synced 2025-12-06 12:20:20 +01:00
700 lines
21 KiB
JavaScript
700 lines
21 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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* @flow
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*/
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import type {Instance} from 'react-reconciler/src/ReactFiberHostConfig';
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import type {FiberRoot} from 'react-reconciler/src/ReactFiberRoot.old';
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import type {
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Family,
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RefreshUpdate,
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ScheduleRefresh,
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ScheduleRoot,
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FindHostInstancesForRefresh,
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SetRefreshHandler,
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} from 'react-reconciler/src/ReactFiberHotReloading';
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import type {ReactNodeList} from 'shared/ReactTypes';
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import {REACT_MEMO_TYPE, REACT_FORWARD_REF_TYPE} from 'shared/ReactSymbols';
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type Signature = {|
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ownKey: string,
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forceReset: boolean,
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fullKey: string | null, // Contains keys of nested Hooks. Computed lazily.
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getCustomHooks: () => Array<Function>,
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|};
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type RendererHelpers = {|
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findHostInstancesForRefresh: FindHostInstancesForRefresh,
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scheduleRefresh: ScheduleRefresh,
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scheduleRoot: ScheduleRoot,
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setRefreshHandler: SetRefreshHandler,
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|};
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if (!__DEV__) {
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throw new Error(
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'React Refresh runtime should not be included in the production bundle.',
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);
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}
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// In old environments, we'll leak previous types after every edit.
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const PossiblyWeakMap = typeof WeakMap === 'function' ? WeakMap : Map;
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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 allFamiliesByType: // $FlowIssue
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WeakMap<any, Family> | Map<any, Family> = new PossiblyWeakMap();
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const allSignaturesByType: // $FlowIssue
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WeakMap<any, Signature> | Map<any, Signature> = new PossiblyWeakMap();
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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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// $FlowIssue
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const updatedFamiliesByType: // $FlowIssue
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WeakMap<any, Family> | Map<any, Family> = new PossiblyWeakMap();
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// This is cleared on every performReactRefresh() 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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// This is injected by the renderer via DevTools global hook.
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const helpersByRendererID: Map<number, RendererHelpers> = new Map();
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const helpersByRoot: Map<FiberRoot, RendererHelpers> = new Map();
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// We keep track of mounted roots so we can schedule updates.
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const mountedRoots: Set<FiberRoot> = new Set();
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// If a root captures an error, we remember it so we can retry on edit.
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const failedRoots: Set<FiberRoot> = new Set();
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// In environments that support WeakMap, we also remember the last element for every root.
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// It needs to be weak because we do this even for roots that failed to mount.
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// If there is no WeakMap, we won't attempt to do retrying.
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// $FlowIssue
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const rootElements: WeakMap<any, ReactNodeList> | null = // $FlowIssue
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typeof WeakMap === 'function' ? new WeakMap() : null;
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let isPerformingRefresh = false;
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function computeFullKey(signature: Signature): string {
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if (signature.fullKey !== null) {
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return signature.fullKey;
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}
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let fullKey: string = signature.ownKey;
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let hooks;
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try {
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hooks = signature.getCustomHooks();
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} catch (err) {
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// This can happen in an edge case, e.g. if expression like Foo.useSomething
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// depends on Foo which is lazily initialized during rendering.
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// In that case just assume we'll have to remount.
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signature.forceReset = true;
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signature.fullKey = fullKey;
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return fullKey;
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}
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for (let i = 0; i < hooks.length; i++) {
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const hook = hooks[i];
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if (typeof hook !== 'function') {
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// Something's wrong. Assume we need to remount.
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signature.forceReset = true;
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signature.fullKey = fullKey;
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return fullKey;
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}
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const nestedHookSignature = allSignaturesByType.get(hook);
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if (nestedHookSignature === undefined) {
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// No signature means Hook wasn't in the source code, e.g. in a library.
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// We'll skip it because we can assume it won't change during this session.
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continue;
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}
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const nestedHookKey = computeFullKey(nestedHookSignature);
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if (nestedHookSignature.forceReset) {
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signature.forceReset = true;
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}
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fullKey += '\n---\n' + nestedHookKey;
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}
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signature.fullKey = fullKey;
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return fullKey;
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}
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function haveEqualSignatures(prevType, nextType) {
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const prevSignature = allSignaturesByType.get(prevType);
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const nextSignature = allSignaturesByType.get(nextType);
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if (prevSignature === undefined && nextSignature === undefined) {
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return true;
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}
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if (prevSignature === undefined || nextSignature === undefined) {
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return false;
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}
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if (computeFullKey(prevSignature) !== computeFullKey(nextSignature)) {
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return false;
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}
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if (nextSignature.forceReset) {
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return false;
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}
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return true;
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}
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function isReactClass(type) {
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return type.prototype && type.prototype.isReactComponent;
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}
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function canPreserveStateBetween(prevType, nextType) {
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if (isReactClass(prevType) || isReactClass(nextType)) {
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return false;
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}
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if (haveEqualSignatures(prevType, nextType)) {
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return true;
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}
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return false;
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}
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function resolveFamily(type) {
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// Only check updated types to keep lookups fast.
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return updatedFamiliesByType.get(type);
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}
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// If we didn't care about IE11, we could use new Map/Set(iterable).
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function cloneMap<K, V>(map: Map<K, V>): Map<K, V> {
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const clone = new Map();
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map.forEach((value, key) => {
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clone.set(key, value);
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});
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return clone;
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}
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function cloneSet<T>(set: Set<T>): Set<T> {
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const clone = new Set();
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set.forEach(value => {
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clone.add(value);
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});
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return clone;
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}
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export function performReactRefresh(): RefreshUpdate | null {
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if (!__DEV__) {
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throw new Error(
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'Unexpected call to React Refresh in a production environment.',
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);
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}
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if (pendingUpdates.length === 0) {
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return null;
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}
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if (isPerformingRefresh) {
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return null;
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}
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isPerformingRefresh = true;
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try {
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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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updatedFamiliesByType.set(prevType, family);
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updatedFamiliesByType.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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if (canPreserveStateBetween(prevType, nextType)) {
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updatedFamilies.add(family);
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} else {
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staleFamilies.add(family);
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}
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});
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// TODO: rename these fields to something more meaningful.
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const update: RefreshUpdate = {
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updatedFamilies, // Families that will re-render preserving state
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staleFamilies, // Families that will be remounted
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};
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helpersByRendererID.forEach(helpers => {
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// Even if there are no roots, set the handler on first update.
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// This ensures that if *new* roots are mounted, they'll use the resolve handler.
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helpers.setRefreshHandler(resolveFamily);
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});
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let didError = false;
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let firstError = null;
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// We snapshot maps and sets that are mutated during commits.
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// If we don't do this, there is a risk they will be mutated while
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// we iterate over them. For example, trying to recover a failed root
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// may cause another root to be added to the failed list -- an infinite loop.
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const failedRootsSnapshot = cloneSet(failedRoots);
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const mountedRootsSnapshot = cloneSet(mountedRoots);
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const helpersByRootSnapshot = cloneMap(helpersByRoot);
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failedRootsSnapshot.forEach(root => {
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const helpers = helpersByRootSnapshot.get(root);
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if (helpers === undefined) {
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throw new Error(
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'Could not find helpers for a root. This is a bug in React Refresh.',
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);
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}
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if (!failedRoots.has(root)) {
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// No longer failed.
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}
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if (rootElements === null) {
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return;
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}
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if (!rootElements.has(root)) {
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return;
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}
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const element = rootElements.get(root);
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try {
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helpers.scheduleRoot(root, element);
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} catch (err) {
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if (!didError) {
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didError = true;
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firstError = err;
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}
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// Keep trying other roots.
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}
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});
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mountedRootsSnapshot.forEach(root => {
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const helpers = helpersByRootSnapshot.get(root);
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if (helpers === undefined) {
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throw new Error(
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'Could not find helpers for a root. This is a bug in React Refresh.',
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);
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}
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if (!mountedRoots.has(root)) {
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// No longer mounted.
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}
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try {
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helpers.scheduleRefresh(root, update);
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} catch (err) {
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if (!didError) {
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didError = true;
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firstError = err;
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}
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// Keep trying other roots.
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}
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});
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if (didError) {
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throw firstError;
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}
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return update;
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} finally {
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isPerformingRefresh = false;
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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 (__DEV__) {
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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 (allFamiliesByType.has(type)) {
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return;
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}
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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 performReactRefresh() 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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allFamiliesByType.set(type, family);
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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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} else {
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throw new Error(
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'Unexpected call to React Refresh in a production environment.',
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);
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}
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}
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export function setSignature(
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type: any,
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key: string,
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forceReset?: boolean = false,
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getCustomHooks?: () => Array<Function>,
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): void {
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if (__DEV__) {
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allSignaturesByType.set(type, {
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forceReset,
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ownKey: key,
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fullKey: null,
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getCustomHooks: getCustomHooks || (() => []),
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});
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} else {
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throw new Error(
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'Unexpected call to React Refresh in a production environment.',
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);
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}
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}
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// This is lazily called during first render for a type.
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// It captures Hook list at that time so inline requires don't break comparisons.
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export function collectCustomHooksForSignature(type: any) {
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if (__DEV__) {
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const signature = allSignaturesByType.get(type);
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if (signature !== undefined) {
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computeFullKey(signature);
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}
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} else {
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throw new Error(
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'Unexpected call to React Refresh in a production environment.',
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);
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}
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}
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export function getFamilyByID(id: string): Family | void {
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if (__DEV__) {
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return allFamiliesByID.get(id);
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} else {
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throw new Error(
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'Unexpected call to React Refresh in a production environment.',
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);
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}
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}
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export function getFamilyByType(type: any): Family | void {
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if (__DEV__) {
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return allFamiliesByType.get(type);
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} else {
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throw new Error(
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'Unexpected call to React Refresh in a production environment.',
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);
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}
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}
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export function findAffectedHostInstances(
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families: Array<Family>,
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): Set<Instance> {
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if (__DEV__) {
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const affectedInstances = new Set();
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mountedRoots.forEach(root => {
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const helpers = helpersByRoot.get(root);
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if (helpers === undefined) {
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throw new Error(
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'Could not find helpers for a root. This is a bug in React Refresh.',
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);
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}
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const instancesForRoot = helpers.findHostInstancesForRefresh(
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root,
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families,
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);
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instancesForRoot.forEach(inst => {
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affectedInstances.add(inst);
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});
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});
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return affectedInstances;
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} else {
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throw new Error(
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'Unexpected call to React Refresh in a production environment.',
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);
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}
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}
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export function injectIntoGlobalHook(globalObject: any): void {
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if (__DEV__) {
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// For React Native, the global hook will be set up by require('react-devtools-core').
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// That code will run before us. So we need to monkeypatch functions on existing hook.
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// For React Web, the global hook will be set up by the extension.
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// This will also run before us.
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let hook = globalObject.__REACT_DEVTOOLS_GLOBAL_HOOK__;
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if (hook === undefined) {
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// However, if there is no DevTools extension, we'll need to set up the global hook ourselves.
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// Note that in this case it's important that renderer code runs *after* this method call.
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// Otherwise, the renderer will think that there is no global hook, and won't do the injection.
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let nextID = 0;
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globalObject.__REACT_DEVTOOLS_GLOBAL_HOOK__ = hook = {
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renderers: new Map(),
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supportsFiber: true,
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inject(injected) {
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return nextID++;
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},
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onScheduleFiberRoot(
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id: number,
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root: FiberRoot,
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children: ReactNodeList,
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) {},
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onCommitFiberRoot(
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id: number,
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root: FiberRoot,
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maybePriorityLevel: mixed,
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didError: boolean,
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) {},
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onCommitFiberUnmount() {},
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};
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}
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// Here, we just want to get a reference to scheduleRefresh.
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const oldInject = hook.inject;
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hook.inject = function(injected) {
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const id = oldInject.apply(this, arguments);
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if (
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typeof injected.scheduleRefresh === 'function' &&
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typeof injected.setRefreshHandler === 'function'
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) {
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// This version supports React Refresh.
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helpersByRendererID.set(id, ((injected: any): RendererHelpers));
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}
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return id;
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};
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// Do the same for any already injected roots.
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// This is useful if ReactDOM has already been initialized.
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// https://github.com/facebook/react/issues/17626
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hook.renderers.forEach((injected, id) => {
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if (
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typeof injected.scheduleRefresh === 'function' &&
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typeof injected.setRefreshHandler === 'function'
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) {
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// This version supports React Refresh.
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helpersByRendererID.set(id, ((injected: any): RendererHelpers));
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}
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});
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// We also want to track currently mounted roots.
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const oldOnCommitFiberRoot = hook.onCommitFiberRoot;
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const oldOnScheduleFiberRoot = hook.onScheduleFiberRoot || (() => {});
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hook.onScheduleFiberRoot = function(
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id: number,
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root: FiberRoot,
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children: ReactNodeList,
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) {
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if (!isPerformingRefresh) {
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// If it was intentionally scheduled, don't attempt to restore.
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// This includes intentionally scheduled unmounts.
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failedRoots.delete(root);
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if (rootElements !== null) {
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rootElements.set(root, children);
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}
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}
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return oldOnScheduleFiberRoot.apply(this, arguments);
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};
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hook.onCommitFiberRoot = function(
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id: number,
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root: FiberRoot,
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maybePriorityLevel: mixed,
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didError: boolean,
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) {
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const helpers = helpersByRendererID.get(id);
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if (helpers === undefined) {
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return;
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}
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helpersByRoot.set(root, helpers);
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const current = root.current;
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const alternate = current.alternate;
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|
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// We need to determine whether this root has just (un)mounted.
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// This logic is copy-pasted from similar logic in the DevTools backend.
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// If this breaks with some refactoring, you'll want to update DevTools too.
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|
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if (alternate !== null) {
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const wasMounted =
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alternate.memoizedState != null &&
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alternate.memoizedState.element != null;
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const isMounted =
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current.memoizedState != null &&
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current.memoizedState.element != null;
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|
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if (!wasMounted && isMounted) {
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// Mount a new root.
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mountedRoots.add(root);
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failedRoots.delete(root);
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} else if (wasMounted && isMounted) {
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// Update an existing root.
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// This doesn't affect our mounted root Set.
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} else if (wasMounted && !isMounted) {
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// Unmount an existing root.
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mountedRoots.delete(root);
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if (didError) {
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// We'll remount it on future edits.
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failedRoots.add(root);
|
|
} else {
|
|
helpersByRoot.delete(root);
|
|
}
|
|
} else if (!wasMounted && !isMounted) {
|
|
if (didError) {
|
|
// We'll remount it on future edits.
|
|
failedRoots.add(root);
|
|
}
|
|
}
|
|
} else {
|
|
// Mount a new root.
|
|
mountedRoots.add(root);
|
|
}
|
|
|
|
return oldOnCommitFiberRoot.apply(this, arguments);
|
|
};
|
|
} else {
|
|
throw new Error(
|
|
'Unexpected call to React Refresh in a production environment.',
|
|
);
|
|
}
|
|
}
|
|
|
|
export function hasUnrecoverableErrors() {
|
|
// TODO: delete this after removing dependency in RN.
|
|
return false;
|
|
}
|
|
|
|
// Exposed for testing.
|
|
export function _getMountedRootCount() {
|
|
if (__DEV__) {
|
|
return mountedRoots.size;
|
|
} else {
|
|
throw new Error(
|
|
'Unexpected call to React Refresh in a production environment.',
|
|
);
|
|
}
|
|
}
|
|
|
|
// This is a wrapper over more primitive functions for setting signature.
|
|
// Signatures let us decide whether the Hook order has changed on refresh.
|
|
//
|
|
// This function is intended to be used as a transform target, e.g.:
|
|
// var _s = createSignatureFunctionForTransform()
|
|
//
|
|
// function Hello() {
|
|
// const [foo, setFoo] = useState(0);
|
|
// const value = useCustomHook();
|
|
// _s(); /* Second call triggers collecting the custom Hook list.
|
|
// * This doesn't happen during the module evaluation because we
|
|
// * don't want to change the module order with inline requires.
|
|
// * Next calls are noops. */
|
|
// return <h1>Hi</h1>;
|
|
// }
|
|
//
|
|
// /* First call specifies the signature: */
|
|
// _s(
|
|
// Hello,
|
|
// 'useState{[foo, setFoo]}(0)',
|
|
// () => [useCustomHook], /* Lazy to avoid triggering inline requires */
|
|
// );
|
|
type SignatureStatus = 'needsSignature' | 'needsCustomHooks' | 'resolved';
|
|
export function createSignatureFunctionForTransform() {
|
|
if (__DEV__) {
|
|
// We'll fill in the signature in two steps.
|
|
// First, we'll know the signature itself. This happens outside the component.
|
|
// Then, we'll know the references to custom Hooks. This happens inside the component.
|
|
// After that, the returned function will be a fast path no-op.
|
|
let status: SignatureStatus = 'needsSignature';
|
|
let savedType;
|
|
let hasCustomHooks;
|
|
return function<T>(
|
|
type: T,
|
|
key: string,
|
|
forceReset?: boolean,
|
|
getCustomHooks?: () => Array<Function>,
|
|
): T {
|
|
switch (status) {
|
|
case 'needsSignature':
|
|
if (type !== undefined) {
|
|
// If we received an argument, this is the initial registration call.
|
|
savedType = type;
|
|
hasCustomHooks = typeof getCustomHooks === 'function';
|
|
setSignature(type, key, forceReset, getCustomHooks);
|
|
// The next call we expect is from inside a function, to fill in the custom Hooks.
|
|
status = 'needsCustomHooks';
|
|
}
|
|
break;
|
|
case 'needsCustomHooks':
|
|
if (hasCustomHooks) {
|
|
collectCustomHooksForSignature(savedType);
|
|
}
|
|
status = 'resolved';
|
|
break;
|
|
case 'resolved':
|
|
// Do nothing. Fast path for all future renders.
|
|
break;
|
|
}
|
|
return type;
|
|
};
|
|
} else {
|
|
throw new Error(
|
|
'Unexpected call to React Refresh in a production environment.',
|
|
);
|
|
}
|
|
}
|
|
|
|
export function isLikelyComponentType(type: any): boolean {
|
|
if (__DEV__) {
|
|
switch (typeof type) {
|
|
case 'function': {
|
|
// First, deal with classes.
|
|
if (type.prototype != null) {
|
|
if (type.prototype.isReactComponent) {
|
|
// React class.
|
|
return true;
|
|
}
|
|
const ownNames = Object.getOwnPropertyNames(type.prototype);
|
|
if (ownNames.length > 1 || ownNames[0] !== 'constructor') {
|
|
// This looks like a class.
|
|
return false;
|
|
}
|
|
// eslint-disable-next-line no-proto
|
|
if (type.prototype.__proto__ !== Object.prototype) {
|
|
// It has a superclass.
|
|
return false;
|
|
}
|
|
// Pass through.
|
|
// This looks like a regular function with empty prototype.
|
|
}
|
|
// For plain functions and arrows, use name as a heuristic.
|
|
const name = type.name || type.displayName;
|
|
return typeof name === 'string' && /^[A-Z]/.test(name);
|
|
}
|
|
case 'object': {
|
|
if (type != null) {
|
|
switch (type.$$typeof) {
|
|
case REACT_FORWARD_REF_TYPE:
|
|
case REACT_MEMO_TYPE:
|
|
// Definitely React components.
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
default: {
|
|
return false;
|
|
}
|
|
}
|
|
} else {
|
|
throw new Error(
|
|
'Unexpected call to React Refresh in a production environment.',
|
|
);
|
|
}
|
|
}
|