| Current File : //home/tradevaly/www/node_modules/webpack/lib/FlagDependencyExportsPlugin.js |
/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
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("./Dependency").ExportsSpec} ExportsSpec */
/** @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 statNoExports = 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) => {
const exportsInfo = moduleGraph.getExportsInfo(module);
if (!module.buildMeta || !module.buildMeta.exportsType) {
if (exportsInfo.otherExportsInfo.provided !== null) {
// It's a module without declared exports
statNoExports++;
exportsInfo.setHasProvideInfo();
exportsInfo.setUnknownExportsProvided();
return callback();
}
}
if (
module.buildInfo.cacheable !== true ||
typeof module.buildInfo.hash !== "string"
) {
statFlaggedUncached++;
// Enqueue uncacheable module for determining the exports
queue.enqueue(module);
exportsInfo.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);
exportsInfo.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;
/** @type {Map<Dependency, ExportsSpec>} */
const exportsSpecsFromDependencies = new Map();
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;
exportsSpecsFromDependencies.set(dep, exportDesc);
};
/**
* @param {Dependency} dep dependency
* @param {ExportsSpec} exportDesc info
* @returns {void}
*/
const processExportsSpec = (dep, exportDesc) => {
const exports = exportDesc.exports;
const globalCanMangle = exportDesc.canMangle;
const globalFrom = exportDesc.from;
const globalPriority = exportDesc.priority;
const globalTerminalBinding =
exportDesc.terminalBinding || false;
const exportDeps = exportDesc.dependencies;
if (exportDesc.hideExports) {
for (const name of exportDesc.hideExports) {
const exportInfo = exportsInfo.getExportInfo(name);
exportInfo.unsetTarget(dep);
}
}
if (exports === true) {
// unknown exports
if (
exportsInfo.setUnknownExportsProvided(
globalCanMangle,
exportDesc.excludeExports,
globalFrom && dep,
globalFrom,
globalPriority
)
) {
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;
let priority = globalPriority;
let hidden = false;
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.priority !== undefined)
priority = exportNameOrSpec.priority;
if (exportNameOrSpec.terminalBinding !== undefined)
terminalBinding = exportNameOrSpec.terminalBinding;
if (exportNameOrSpec.hidden !== undefined)
hidden = exportNameOrSpec.hidden;
}
const exportInfo = exportsInfo.getExportInfo(name);
if (
exportInfo.provided === false ||
exportInfo.provided === null
) {
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 &&
(hidden
? exportInfo.unsetTarget(dep)
: exportInfo.setTarget(
dep,
from,
fromExport === undefined ? [name] : fromExport,
priority
))
) {
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);
cacheable = true;
changed = false;
exportsSpecsFromDependencies.clear();
moduleGraph.freeze();
processDependenciesBlock(module);
moduleGraph.unfreeze();
for (const [
dep,
exportsSpec
] of exportsSpecsFromDependencies) {
processExportsSpec(dep, exportsSpec);
}
if (cacheable) {
modulesToStore.add(module);
}
if (changed) {
notifyDependencies();
}
}
logger.timeEnd("figure out provided exports");
logger.log(
`${Math.round(
(100 * (statFlaggedUncached + statNotCached)) /
(statRestoredFromCache +
statNotCached +
statFlaggedUncached +
statNoExports)
)}% of exports of modules have been determined (${statNoExports} no declared exports, ${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;