webpack
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Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.
365 lines (331 loc) • 11.2 kB
JavaScript
/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
;
const asyncLib = require("neo-async");
const Queue = require("./util/Queue");
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./DependenciesBlock")} DependenciesBlock */
/** @typedef {import("./Dependency")} Dependency */
/** @typedef {import("./Dependency").ExportSpec} ExportSpec */
/** @typedef {import("./ExportsInfo")} ExportsInfo */
/** @typedef {import("./Module")} Module */
class FlagDependencyExportsPlugin {
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.compilation.tap(
"FlagDependencyExportsPlugin",
compilation => {
const moduleGraph = compilation.moduleGraph;
const cache = compilation.getCache("FlagDependencyExportsPlugin");
compilation.hooks.finishModules.tapAsync(
"FlagDependencyExportsPlugin",
(modules, callback) => {
const logger = compilation.getLogger(
"webpack.FlagDependencyExportsPlugin"
);
let statRestoredFromCache = 0;
let statFlaggedUncached = 0;
let statNotCached = 0;
let statQueueItemsProcessed = 0;
/** @type {Queue<Module>} */
const queue = new Queue();
// Step 1: Try to restore cached provided export info from cache
logger.time("restore cached provided exports");
asyncLib.each(
modules,
(module, callback) => {
if (
module.buildInfo.cacheable !== true ||
typeof module.buildInfo.hash !== "string"
) {
statFlaggedUncached++;
// Enqueue uncacheable module for determining the exports
queue.enqueue(module);
moduleGraph.getExportsInfo(module).setHasProvideInfo();
return callback();
}
cache.get(
module.identifier(),
module.buildInfo.hash,
(err, result) => {
if (err) return callback(err);
if (result !== undefined) {
statRestoredFromCache++;
moduleGraph
.getExportsInfo(module)
.restoreProvided(result);
} else {
statNotCached++;
// Without cached info enqueue module for determining the exports
queue.enqueue(module);
moduleGraph.getExportsInfo(module).setHasProvideInfo();
}
callback();
}
);
},
err => {
logger.timeEnd("restore cached provided exports");
if (err) return callback(err);
/** @type {Set<Module>} */
const modulesToStore = new Set();
/** @type {Map<Module, Set<Module>>} */
const dependencies = new Map();
/** @type {Module} */
let module;
/** @type {ExportsInfo} */
let exportsInfo;
let cacheable = true;
let changed = false;
/**
* @param {DependenciesBlock} depBlock the dependencies block
* @returns {void}
*/
const processDependenciesBlock = depBlock => {
for (const dep of depBlock.dependencies) {
processDependency(dep);
}
for (const block of depBlock.blocks) {
processDependenciesBlock(block);
}
};
/**
* @param {Dependency} dep the dependency
* @returns {void}
*/
const processDependency = dep => {
const exportDesc = dep.getExports(moduleGraph);
if (!exportDesc) return;
const exports = exportDesc.exports;
const globalCanMangle = exportDesc.canMangle;
const globalFrom = exportDesc.from;
const globalTerminalBinding =
exportDesc.terminalBinding || false;
const exportDeps = exportDesc.dependencies;
if (exports === true) {
// unknown exports
if (
exportsInfo.setUnknownExportsProvided(
globalCanMangle,
exportDesc.excludeExports,
globalFrom && dep,
globalFrom
)
) {
changed = true;
}
} else if (Array.isArray(exports)) {
/**
* merge in new exports
* @param {ExportsInfo} exportsInfo own exports info
* @param {(ExportSpec | string)[]} exports list of exports
*/
const mergeExports = (exportsInfo, exports) => {
for (const exportNameOrSpec of exports) {
let name;
let canMangle = globalCanMangle;
let terminalBinding = globalTerminalBinding;
let exports = undefined;
let from = globalFrom;
let fromExport = undefined;
if (typeof exportNameOrSpec === "string") {
name = exportNameOrSpec;
} else {
name = exportNameOrSpec.name;
if (exportNameOrSpec.canMangle !== undefined)
canMangle = exportNameOrSpec.canMangle;
if (exportNameOrSpec.export !== undefined)
fromExport = exportNameOrSpec.export;
if (exportNameOrSpec.exports !== undefined)
exports = exportNameOrSpec.exports;
if (exportNameOrSpec.from !== undefined)
from = exportNameOrSpec.from;
if (exportNameOrSpec.terminalBinding !== undefined)
terminalBinding = exportNameOrSpec.terminalBinding;
}
const exportInfo = exportsInfo.getExportInfo(name);
if (exportInfo.provided === false) {
exportInfo.provided = true;
changed = true;
}
if (
exportInfo.canMangleProvide !== false &&
canMangle === false
) {
exportInfo.canMangleProvide = false;
changed = true;
}
if (terminalBinding && !exportInfo.terminalBinding) {
exportInfo.terminalBinding = true;
changed = true;
}
if (exports) {
const nestedExportsInfo = exportInfo.createNestedExportsInfo();
mergeExports(nestedExportsInfo, exports);
}
if (
from &&
exportInfo.setTarget(
dep,
from,
fromExport === undefined ? [name] : fromExport
)
) {
changed = true;
}
// Recalculate target exportsInfo
const target = exportInfo.getTarget(moduleGraph);
let targetExportsInfo = undefined;
if (target) {
const targetModuleExportsInfo = moduleGraph.getExportsInfo(
target.module
);
targetExportsInfo = targetModuleExportsInfo.getNestedExportsInfo(
target.export
);
// add dependency for this module
const set = dependencies.get(target.module);
if (set === undefined) {
dependencies.set(target.module, new Set([module]));
} else {
set.add(module);
}
}
if (exportInfo.exportsInfoOwned) {
if (
exportInfo.exportsInfo.setRedirectNamedTo(
targetExportsInfo
)
) {
changed = true;
}
} else if (
exportInfo.exportsInfo !== targetExportsInfo
) {
exportInfo.exportsInfo = targetExportsInfo;
changed = true;
}
}
};
mergeExports(exportsInfo, exports);
}
// store dependencies
if (exportDeps) {
cacheable = false;
for (const exportDependency of exportDeps) {
// add dependency for this module
const set = dependencies.get(exportDependency);
if (set === undefined) {
dependencies.set(exportDependency, new Set([module]));
} else {
set.add(module);
}
}
}
};
const notifyDependencies = () => {
const deps = dependencies.get(module);
if (deps !== undefined) {
for (const dep of deps) {
queue.enqueue(dep);
}
}
};
logger.time("figure out provided exports");
while (queue.length > 0) {
module = queue.dequeue();
statQueueItemsProcessed++;
exportsInfo = moduleGraph.getExportsInfo(module);
if (!module.buildMeta || !module.buildMeta.exportsType) {
if (exportsInfo.otherExportsInfo.provided !== null) {
// It's a module without declared exports
exportsInfo.setUnknownExportsProvided();
modulesToStore.add(module);
notifyDependencies();
}
} else {
// It's a module with declared exports
cacheable = true;
changed = false;
processDependenciesBlock(module);
if (cacheable) {
modulesToStore.add(module);
}
if (changed) {
notifyDependencies();
}
}
}
logger.timeEnd("figure out provided exports");
logger.log(
`${Math.round(
100 -
(100 * statRestoredFromCache) /
(statRestoredFromCache +
statNotCached +
statFlaggedUncached)
)}% of exports of modules have been determined (${statNotCached} not cached, ${statFlaggedUncached} flagged uncacheable, ${statRestoredFromCache} from cache, ${
statQueueItemsProcessed -
statNotCached -
statFlaggedUncached
} additional calculations due to dependencies)`
);
logger.time("store provided exports into cache");
asyncLib.each(
modulesToStore,
(module, callback) => {
if (
module.buildInfo.cacheable !== true ||
typeof module.buildInfo.hash !== "string"
) {
// not cacheable
return callback();
}
cache.store(
module.identifier(),
module.buildInfo.hash,
moduleGraph
.getExportsInfo(module)
.getRestoreProvidedData(),
callback
);
},
err => {
logger.timeEnd("store provided exports into cache");
callback(err);
}
);
}
);
}
);
/** @type {WeakMap<Module, any>} */
const providedExportsCache = new WeakMap();
compilation.hooks.rebuildModule.tap(
"FlagDependencyExportsPlugin",
module => {
providedExportsCache.set(
module,
moduleGraph.getExportsInfo(module).getRestoreProvidedData()
);
}
);
compilation.hooks.finishRebuildingModule.tap(
"FlagDependencyExportsPlugin",
module => {
moduleGraph
.getExportsInfo(module)
.restoreProvided(providedExportsCache.get(module));
}
);
}
);
}
}
module.exports = FlagDependencyExportsPlugin;