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276 lines (256 loc) · 11.2 KB
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const Template = require("./Template");
const ModuleHotAcceptDependency = require("./dependencies/ModuleHotAcceptDependency");
const ModuleHotDeclineDependency = require("./dependencies/ModuleHotDeclineDependency");
const RawSource = require("webpack-sources").RawSource;
const ConstDependency = require("./dependencies/ConstDependency");
const NullFactory = require("./NullFactory");
const ParserHelpers = require("./ParserHelpers");
const createHash = require("./util/createHash");
const SyncBailHook = require("tapable").SyncBailHook;
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();
});
compiler.hooks.compilation.tap("HotModuleReplacementPlugin", (compilation, {
normalModuleFactory
}) => {
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 = {};
compilation.modules.forEach(module => {
const identifier = module.identifier();
const hash = createHash(compilation.outputOptions.hashFunction);
module.updateHash(hash);
records.moduleHashs[identifier] = hash.digest("hex");
});
records.chunkHashs = {};
compilation.chunks.forEach(chunk => {
records.chunkHashs[chunk.id] = chunk.hash;
});
records.chunkModuleIds = {};
compilation.chunks.forEach(chunk => {
records.chunkModuleIds[chunk.id] = chunk.mapModules(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;
compilation.modules.forEach(module => {
const identifier = module.identifier();
let hash = createHash(compilation.outputOptions.hashFunction);
module.updateHash(hash);
hash = hash.digest("hex");
module.hotUpdate = records.moduleHashs[identifier] !== hash;
});
const hotUpdateMainContent = {
h: compilation.hash,
c: {},
};
Object.keys(records.chunkHashs).forEach(chunkId => {
chunkId = isNaN(+chunkId) ? chunkId : +chunkId;
const currentChunk = compilation.chunks.find(chunk => chunk.id === chunkId);
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 filename = compilation.getPath(hotUpdateChunkFilename, {
hash: records.hash,
chunk: currentChunk
});
compilation.additionalChunkAssets.push(filename);
compilation.assets[filename] = source;
hotUpdateMainContent.c[chunkId] = true;
currentChunk.files.push(filename);
compilation.applyPlugins("chunk-asset", currentChunk, filename);
}
} else {
hotUpdateMainContent.c[chunkId] = false;
}
}, compilation);
const source = new RawSource(JSON.stringify(hotUpdateMainContent));
const filename = compilation.getPath(hotUpdateMainFilename, {
hash: records.hash
});
compilation.assets[filename] = source;
});
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: []"
]);
});
const handler = (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("HotModuleReplacementPlugin", 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);
else
parser.hooks.hotAcceptWithoutCallback.call(expr, requests);
}
}
});
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);
};
// TODO add HMR support for javascript/esm
normalModuleFactory.hooks.parser.for("javascript/auto").tap("HotModuleReplacementPlugin", handler);
normalModuleFactory.hooks.parser.for("javascript/dynamic").tap("HotModuleReplacementPlugin", handler);
compilation.hooks.normalModuleLoader.tap("HotModuleReplacementPlugin", context => {
context.hot = true;
});
});
}
};
const hotInitCode = Template.getFunctionContent(require("./HotModuleReplacement.runtime.js"));