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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { SyncBailHook } = require("tapable");
const { RawSource } = require("webpack-sources");
const Template = require("./Template");
const ModuleHotAcceptDependency = require("./dependencies/ModuleHotAcceptDependency");
const ModuleHotDeclineDependency = require("./dependencies/ModuleHotDeclineDependency");
const ConstDependency = require("./dependencies/ConstDependency");
const NullFactory = require("./NullFactory");
const ParserHelpers = require("./ParserHelpers");
module.exports = class HotModuleReplacementPlugin {
constructor(options) {
this.options = options || {};
this.multiStep = this.options.multiStep;
this.fullBuildTimeout = this.options.fullBuildTimeout || 200;
this.requestTimeout = this.options.requestTimeout || 10000;
}
apply(compiler) {
const multiStep = this.multiStep;
const fullBuildTimeout = this.fullBuildTimeout;
const requestTimeout = this.requestTimeout;
const hotUpdateChunkFilename =
compiler.options.output.hotUpdateChunkFilename;
const hotUpdateMainFilename = compiler.options.output.hotUpdateMainFilename;
compiler.hooks.additionalPass.tapAsync(
"HotModuleReplacementPlugin",
callback => {
if (multiStep) return setTimeout(callback, fullBuildTimeout);
return callback();
}
);
const addParserPlugins = (parser, parserOptions) => {
parser.hooks.expression
.for("__webpack_hash__")
.tap(
"HotModuleReplacementPlugin",
ParserHelpers.toConstantDependencyWithWebpackRequire(
parser,
"__webpack_require__.h()"
)
);
parser.hooks.evaluateTypeof
.for("__webpack_hash__")
.tap(
"HotModuleReplacementPlugin",
ParserHelpers.evaluateToString("string")
);
parser.hooks.evaluateIdentifier.for("module.hot").tap(
{
name: "HotModuleReplacementPlugin",
before: "NodeStuffPlugin"
},
expr => {
return ParserHelpers.evaluateToIdentifier(
"module.hot",
!!parser.state.compilation.hotUpdateChunkTemplate
)(expr);
}
);
// TODO webpack 5: refactor this, no custom hooks
if (!parser.hooks.hotAcceptCallback) {
parser.hooks.hotAcceptCallback = new SyncBailHook([
"expression",
"requests"
]);
}
if (!parser.hooks.hotAcceptWithoutCallback) {
parser.hooks.hotAcceptWithoutCallback = new SyncBailHook([
"expression",
"requests"
]);
}
parser.hooks.call
.for("module.hot.accept")
.tap("HotModuleReplacementPlugin", expr => {
if (!parser.state.compilation.hotUpdateChunkTemplate) {
return false;
}
if (expr.arguments.length >= 1) {
const arg = parser.evaluateExpression(expr.arguments[0]);
let params = [];
let requests = [];
if (arg.isString()) {
params = [arg];
} else if (arg.isArray()) {
params = arg.items.filter(param => param.isString());
}
if (params.length > 0) {
params.forEach((param, idx) => {
const request = param.string;
const dep = new ModuleHotAcceptDependency(request, param.range);
dep.optional = true;
dep.loc = Object.create(expr.loc);
dep.loc.index = idx;
parser.state.module.addDependency(dep);
requests.push(request);
});
if (expr.arguments.length > 1) {
parser.hooks.hotAcceptCallback.call(
expr.arguments[1],
requests
);
parser.walkExpression(expr.arguments[1]); // other args are ignored
return true;
} else {
parser.hooks.hotAcceptWithoutCallback.call(expr, requests);
return true;
}
}
}
});
parser.hooks.call
.for("module.hot.decline")
.tap("HotModuleReplacementPlugin", expr => {
if (!parser.state.compilation.hotUpdateChunkTemplate) {
return false;
}
if (expr.arguments.length === 1) {
const arg = parser.evaluateExpression(expr.arguments[0]);
let params = [];
if (arg.isString()) {
params = [arg];
} else if (arg.isArray()) {
params = arg.items.filter(param => param.isString());
}
params.forEach((param, idx) => {
const dep = new ModuleHotDeclineDependency(
param.string,
param.range
);
dep.optional = true;
dep.loc = Object.create(expr.loc);
dep.loc.index = idx;
parser.state.module.addDependency(dep);
});
}
});
parser.hooks.expression
.for("module.hot")
.tap("HotModuleReplacementPlugin", ParserHelpers.skipTraversal);
};
compiler.hooks.compilation.tap(
"HotModuleReplacementPlugin",
(compilation, { normalModuleFactory }) => {
// This applies the HMR plugin only to the targeted compiler
// It should not affect child compilations
if (compilation.compiler !== compiler) return;
const hotUpdateChunkTemplate = compilation.hotUpdateChunkTemplate;
if (!hotUpdateChunkTemplate) return;
compilation.dependencyFactories.set(ConstDependency, new NullFactory());
compilation.dependencyTemplates.set(
ConstDependency,
new ConstDependency.Template()
);
compilation.dependencyFactories.set(
ModuleHotAcceptDependency,
normalModuleFactory
);
compilation.dependencyTemplates.set(
ModuleHotAcceptDependency,
new ModuleHotAcceptDependency.Template()
);
compilation.dependencyFactories.set(
ModuleHotDeclineDependency,
normalModuleFactory
);
compilation.dependencyTemplates.set(
ModuleHotDeclineDependency,
new ModuleHotDeclineDependency.Template()
);
compilation.hooks.record.tap(
"HotModuleReplacementPlugin",
(compilation, records) => {
if (records.hash === compilation.hash) return;
records.hash = compilation.hash;
records.moduleHashs = {};
for (const module of compilation.modules) {
const identifier = module.identifier();
records.moduleHashs[identifier] = module.hash;
}
records.chunkHashs = {};
for (const chunk of compilation.chunks) {
records.chunkHashs[chunk.id] = chunk.hash;
}
records.chunkModuleIds = {};
for (const chunk of compilation.chunks) {
records.chunkModuleIds[chunk.id] = Array.from(
chunk.modulesIterable,
m => m.id
);
}
}
);
let initialPass = false;
let recompilation = false;
compilation.hooks.afterHash.tap("HotModuleReplacementPlugin", () => {
let records = compilation.records;
if (!records) {
initialPass = true;
return;
}
if (!records.hash) initialPass = true;
const preHash = records.preHash || "x";
const prepreHash = records.prepreHash || "x";
if (preHash === compilation.hash) {
recompilation = true;
compilation.modifyHash(prepreHash);
return;
}
records.prepreHash = records.hash || "x";
records.preHash = compilation.hash;
compilation.modifyHash(records.prepreHash);
});
compilation.hooks.shouldGenerateChunkAssets.tap(
"HotModuleReplacementPlugin",
() => {
if (multiStep && !recompilation && !initialPass) return false;
}
);
compilation.hooks.needAdditionalPass.tap(
"HotModuleReplacementPlugin",
() => {
if (multiStep && !recompilation && !initialPass) return true;
}
);
compilation.hooks.additionalChunkAssets.tap(
"HotModuleReplacementPlugin",
() => {
const records = compilation.records;
if (records.hash === compilation.hash) return;
if (
!records.moduleHashs ||
!records.chunkHashs ||
!records.chunkModuleIds
)
return;
for (const module of compilation.modules) {
const identifier = module.identifier();
let hash = module.hash;
module.hotUpdate = records.moduleHashs[identifier] !== hash;
}
const hotUpdateMainContent = {
h: compilation.hash,
c: {}
};
for (const key of Object.keys(records.chunkHashs)) {
const chunkId = isNaN(+key) ? key : +key;
const currentChunk = compilation.chunks.find(
chunk => `${chunk.id}` === key
);
if (currentChunk) {
const newModules = currentChunk
.getModules()
.filter(module => module.hotUpdate);
const allModules = new Set();
for (const module of currentChunk.modulesIterable) {
allModules.add(module.id);
}
const removedModules = records.chunkModuleIds[chunkId].filter(
id => !allModules.has(id)
);
if (newModules.length > 0 || removedModules.length > 0) {
const source = hotUpdateChunkTemplate.render(
chunkId,
newModules,
removedModules,
compilation.hash,
compilation.moduleTemplates.javascript,
compilation.dependencyTemplates
);
const {
path: filename,
info: assetInfo
} = compilation.getPathWithInfo(hotUpdateChunkFilename, {
hash: records.hash,
chunk: currentChunk
});
compilation.additionalChunkAssets.push(filename);
compilation.emitAsset(
filename,
source,
Object.assign({ hotModuleReplacement: true }, assetInfo)
);
hotUpdateMainContent.c[chunkId] = true;
currentChunk.files.push(filename);
compilation.hooks.chunkAsset.call(currentChunk, filename);
}
} else {
hotUpdateMainContent.c[chunkId] = false;
}
}
const source = new RawSource(JSON.stringify(hotUpdateMainContent));
const {
path: filename,
info: assetInfo
} = compilation.getPathWithInfo(hotUpdateMainFilename, {
hash: records.hash
});
compilation.emitAsset(
filename,
source,
Object.assign({ hotModuleReplacement: true }, assetInfo)
);
}
);
const mainTemplate = compilation.mainTemplate;
mainTemplate.hooks.hash.tap("HotModuleReplacementPlugin", hash => {
hash.update("HotMainTemplateDecorator");
});
mainTemplate.hooks.moduleRequire.tap(
"HotModuleReplacementPlugin",
(_, chunk, hash, varModuleId) => {
return `hotCreateRequire(${varModuleId})`;
}
);
mainTemplate.hooks.requireExtensions.tap(
"HotModuleReplacementPlugin",
source => {
const buf = [source];
buf.push("");
buf.push("// __webpack_hash__");
buf.push(
mainTemplate.requireFn +
".h = function() { return hotCurrentHash; };"
);
return Template.asString(buf);
}
);
const needChunkLoadingCode = chunk => {
for (const chunkGroup of chunk.groupsIterable) {
if (chunkGroup.chunks.length > 1) return true;
if (chunkGroup.getNumberOfChildren() > 0) return true;
}
return false;
};
mainTemplate.hooks.bootstrap.tap(
"HotModuleReplacementPlugin",
(source, chunk, hash) => {
source = mainTemplate.hooks.hotBootstrap.call(source, chunk, hash);
return Template.asString([
source,
"",
hotInitCode
.replace(/\$require\$/g, mainTemplate.requireFn)
.replace(/\$hash\$/g, JSON.stringify(hash))
.replace(/\$requestTimeout\$/g, requestTimeout)
.replace(
/\/\*foreachInstalledChunks\*\//g,
needChunkLoadingCode(chunk)
? "for(var chunkId in installedChunks)"
: `var chunkId = ${JSON.stringify(chunk.id)};`
)
]);
}
);
mainTemplate.hooks.globalHash.tap(
"HotModuleReplacementPlugin",
() => true
);
mainTemplate.hooks.currentHash.tap(
"HotModuleReplacementPlugin",
(_, length) => {
if (isFinite(length)) {
return `hotCurrentHash.substr(0, ${length})`;
} else {
return "hotCurrentHash";
}
}
);
mainTemplate.hooks.moduleObj.tap(
"HotModuleReplacementPlugin",
(source, chunk, hash, varModuleId) => {
return Template.asString([
`${source},`,
`hot: hotCreateModule(${varModuleId}),`,
"parents: (hotCurrentParentsTemp = hotCurrentParents, hotCurrentParents = [], hotCurrentParentsTemp),",
"children: []"
]);
}
);
// TODO add HMR support for javascript/esm
normalModuleFactory.hooks.parser
.for("javascript/auto")
.tap("HotModuleReplacementPlugin", addParserPlugins);
normalModuleFactory.hooks.parser
.for("javascript/dynamic")
.tap("HotModuleReplacementPlugin", addParserPlugins);
compilation.hooks.normalModuleLoader.tap(
"HotModuleReplacementPlugin",
context => {
context.hot = true;
}
);
}
);
}
};
const hotInitCode = Template.getFunctionContent(
require("./HotModuleReplacement.runtime")
);