@pmmmwh/react-refresh-webpack-plugin
Version:
An **EXPERIMENTAL** Webpack plugin to enable "Fast Refresh" (also previously known as _Hot Reloading_) for React components.
244 lines (222 loc) • 9.04 kB
JavaScript
const { validate: validateOptions } = require('schema-utils');
const { getRefreshGlobalScope } = require('./globals');
const {
getAdditionalEntries,
getIntegrationEntry,
getSocketIntegration,
injectRefreshLoader,
makeRefreshRuntimeModule,
normalizeOptions,
} = require('./utils');
const schema = require('./options.json');
class ReactRefreshPlugin {
/**
* @param {import('./types').ReactRefreshPluginOptions} [options] Options for react-refresh-plugin.
*/
constructor(options = {}) {
validateOptions(schema, options, {
name: 'React Refresh Plugin',
baseDataPath: 'options',
});
/**
* @readonly
* @type {import('./types').NormalizedPluginOptions}
*/
this.options = normalizeOptions(options);
}
/**
* Applies the plugin.
* @param {import('webpack').Compiler} compiler A webpack compiler object.
* @returns {void}
*/
apply(compiler) {
// Skip processing in non-development mode, but allow manual force-enabling
if (
// Webpack do not set process.env.NODE_ENV, so we need to check for mode.
// Ref: https://github.com/webpack/webpack/issues/7074
(compiler.options.mode !== 'development' ||
// We also check for production process.env.NODE_ENV,
// in case it was set and mode is non-development (e.g. 'none')
(process.env.NODE_ENV && process.env.NODE_ENV === 'production')) &&
!this.options.forceEnable
) {
return;
}
const logger = compiler.getInfrastructureLogger(this.constructor.name);
// Get Webpack imports from compiler instance (if available) -
// this allow mono-repos to use different versions of Webpack without conflicts.
const webpack = compiler.webpack || require('webpack');
const {
DefinePlugin,
EntryDependency,
EntryPlugin,
ModuleFilenameHelpers,
NormalModule,
ProvidePlugin,
RuntimeGlobals,
Template,
} = webpack;
// Inject react-refresh context to all Webpack entry points.
const { overlayEntries, prependEntries } = getAdditionalEntries(this.options);
// Prepended entries does not care about injection order,
// so we can utilise EntryPlugin for simpler logic.
for (const entry of prependEntries) {
new EntryPlugin(compiler.context, entry, { name: undefined }).apply(compiler);
}
const integrationEntry = getIntegrationEntry(this.options.overlay.sockIntegration);
const socketEntryData = [];
compiler.hooks.make.tap(
{ name: this.constructor.name, stage: Number.POSITIVE_INFINITY },
(compilation) => {
// Exhaustively search all entries for `integrationEntry`.
// If found, mark those entries and the index of `integrationEntry`.
for (const [name, entryData] of compilation.entries.entries()) {
const index = entryData.dependencies.findIndex(
(dep) => dep.request && dep.request.includes(integrationEntry)
);
if (index !== -1) {
socketEntryData.push({ name, index });
}
}
}
);
// Overlay entries need to be injected AFTER integration's entry,
// so we will loop through everything in `finishMake` instead of `make`.
// This ensures we can traverse all entry points and inject stuff with the correct order.
for (const [idx, entry] of overlayEntries.entries()) {
compiler.hooks.finishMake.tapPromise(
{
name: this.constructor.name,
stage: Number.MIN_SAFE_INTEGER + (overlayEntries.length - idx - 1),
},
(compilation) => {
// Only hook into the current compiler
if (compilation.compiler !== compiler) {
return Promise.resolve();
}
const injectData = socketEntryData.length ? socketEntryData : [{ name: undefined }];
return Promise.all(
injectData.map(({ name, index }) => {
return new Promise((resolve, reject) => {
const options = { name };
const dep = EntryPlugin.createDependency(entry, options);
compilation.addEntry(compiler.context, dep, options, (err) => {
if (err) return reject(err);
// If the entry is not a global one,
// and we have registered the index for integration entry,
// we will reorder all entry dependencies to our desired order.
// That is, to have additional entries DIRECTLY behind integration entry.
if (name && typeof index !== 'undefined') {
const entryData = compilation.entries.get(name);
entryData.dependencies.splice(
index + 1,
0,
entryData.dependencies.splice(entryData.dependencies.length - 1, 1)[0]
);
}
resolve();
});
});
})
);
}
);
}
// Inject necessary modules and variables to bundle's global scope
const refreshGlobal = getRefreshGlobalScope(RuntimeGlobals || {});
/** @type {Record<string, string | boolean>}*/
const definedModules = {
// Mapping of react-refresh globals to Webpack runtime globals
$RefreshReg$: `${refreshGlobal}.register`,
$RefreshSig$: `${refreshGlobal}.signature`,
'typeof $RefreshReg$': 'function',
'typeof $RefreshSig$': 'function',
// Library mode
__react_refresh_library__: JSON.stringify(
Template.toIdentifier(
this.options.library ||
compiler.options.output.uniqueName ||
compiler.options.output.library
)
),
};
/** @type {Record<string, string>} */
const providedModules = {
__react_refresh_utils__: require.resolve('./runtime/RefreshUtils'),
};
if (this.options.overlay === false) {
// Stub errorOverlay module so their calls can be erased
definedModules.__react_refresh_error_overlay__ = false;
definedModules.__react_refresh_socket__ = false;
} else {
if (this.options.overlay.module) {
providedModules.__react_refresh_error_overlay__ = require.resolve(
this.options.overlay.module
);
}
if (this.options.overlay.sockIntegration) {
providedModules.__react_refresh_socket__ = getSocketIntegration(
this.options.overlay.sockIntegration
);
}
}
new DefinePlugin(definedModules).apply(compiler);
new ProvidePlugin(providedModules).apply(compiler);
const match = ModuleFilenameHelpers.matchObject.bind(undefined, this.options);
let loggedHotWarning = false;
compiler.hooks.compilation.tap(
this.constructor.name,
(compilation, { normalModuleFactory }) => {
// Only hook into the current compiler
if (compilation.compiler !== compiler) {
return;
}
// Set factory for EntryDependency which is used to initialise the module
compilation.dependencyFactories.set(EntryDependency, normalModuleFactory);
const ReactRefreshRuntimeModule = makeRefreshRuntimeModule(webpack);
compilation.hooks.additionalTreeRuntimeRequirements.tap(
this.constructor.name,
// Setup react-refresh globals with a Webpack runtime module
(chunk, runtimeRequirements) => {
runtimeRequirements.add(RuntimeGlobals.interceptModuleExecution);
runtimeRequirements.add(RuntimeGlobals.moduleCache);
runtimeRequirements.add(refreshGlobal);
compilation.addRuntimeModule(chunk, new ReactRefreshRuntimeModule());
}
);
normalModuleFactory.hooks.afterResolve.tap(
this.constructor.name,
// Add react-refresh loader to process files that matches specified criteria
(resolveData) => {
injectRefreshLoader(resolveData.createData, {
match,
options: {
const: compilation.runtimeTemplate.supportsConst(),
esModule: this.options.esModule,
},
});
}
);
NormalModule.getCompilationHooks(compilation).loader.tap(
// `Infinity` ensures this check will run only after all other taps
{ name: this.constructor.name, stage: Infinity },
// Check for existence of the HMR runtime -
// it is the foundation to this plugin working correctly
(context) => {
if (!context.hot && !loggedHotWarning) {
logger.warn(
[
'Hot Module Replacement (HMR) is not enabled!',
'React Refresh requires HMR to function properly.',
].join(' ')
);
loggedHotWarning = true;
}
}
);
}
);
}
}
module.exports.ReactRefreshPlugin = ReactRefreshPlugin;
module.exports = ReactRefreshPlugin;