| 1 | /*
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| 2 | MIT License http://www.opensource.org/licenses/mit-license.php
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| 3 | Author Tobias Koppers @sokra
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| 4 | */
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| 5 |
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| 6 | "use strict";
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| 7 |
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| 8 | const asyncLib = require("neo-async");
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| 9 | const Queue = require("./util/Queue");
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| 10 |
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| 11 | /** @typedef {import("./Compiler")} Compiler */
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| 12 | /** @typedef {import("./DependenciesBlock")} DependenciesBlock */
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| 13 | /** @typedef {import("./Dependency")} Dependency */
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| 14 | /** @typedef {import("./Dependency").ExportSpec} ExportSpec */
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| 15 | /** @typedef {import("./Dependency").ExportsSpec} ExportsSpec */
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| 16 | /** @typedef {import("./ExportsInfo")} ExportsInfo */
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| 17 | /** @typedef {import("./Module")} Module */
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| 18 |
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| 19 | class FlagDependencyExportsPlugin {
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| 20 | /**
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| 21 | * Apply the plugin
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| 22 | * @param {Compiler} compiler the compiler instance
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| 23 | * @returns {void}
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| 24 | */
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| 25 | apply(compiler) {
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| 26 | compiler.hooks.compilation.tap(
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| 27 | "FlagDependencyExportsPlugin",
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| 28 | compilation => {
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| 29 | const moduleGraph = compilation.moduleGraph;
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| 30 | const cache = compilation.getCache("FlagDependencyExportsPlugin");
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| 31 | compilation.hooks.finishModules.tapAsync(
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| 32 | "FlagDependencyExportsPlugin",
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| 33 | (modules, callback) => {
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| 34 | const logger = compilation.getLogger(
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| 35 | "webpack.FlagDependencyExportsPlugin"
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| 36 | );
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| 37 | let statRestoredFromCache = 0;
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| 38 | let statNoExports = 0;
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| 39 | let statFlaggedUncached = 0;
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| 40 | let statNotCached = 0;
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| 41 | let statQueueItemsProcessed = 0;
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| 42 |
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| 43 | /** @type {Queue<Module>} */
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| 44 | const queue = new Queue();
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| 45 |
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| 46 | // Step 1: Try to restore cached provided export info from cache
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| 47 | logger.time("restore cached provided exports");
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| 48 | asyncLib.each(
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| 49 | modules,
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| 50 | (module, callback) => {
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| 51 | const exportsInfo = moduleGraph.getExportsInfo(module);
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| 52 | if (!module.buildMeta || !module.buildMeta.exportsType) {
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| 53 | if (exportsInfo.otherExportsInfo.provided !== null) {
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| 54 | // It's a module without declared exports
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| 55 | statNoExports++;
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| 56 | exportsInfo.setHasProvideInfo();
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| 57 | exportsInfo.setUnknownExportsProvided();
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| 58 | return callback();
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| 59 | }
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| 60 | }
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| 61 | if (
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| 62 | module.buildInfo.cacheable !== true ||
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| 63 | typeof module.buildInfo.hash !== "string"
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| 64 | ) {
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| 65 | statFlaggedUncached++;
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| 66 | // Enqueue uncacheable module for determining the exports
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| 67 | queue.enqueue(module);
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| 68 | exportsInfo.setHasProvideInfo();
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| 69 | return callback();
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| 70 | }
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| 71 | cache.get(
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| 72 | module.identifier(),
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| 73 | module.buildInfo.hash,
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| 74 | (err, result) => {
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| 75 | if (err) return callback(err);
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| 76 |
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| 77 | if (result !== undefined) {
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| 78 | statRestoredFromCache++;
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| 79 | moduleGraph
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| 80 | .getExportsInfo(module)
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| 81 | .restoreProvided(result);
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| 82 | } else {
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| 83 | statNotCached++;
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| 84 | // Without cached info enqueue module for determining the exports
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| 85 | queue.enqueue(module);
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| 86 | exportsInfo.setHasProvideInfo();
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| 87 | }
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| 88 | callback();
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| 89 | }
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| 90 | );
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| 91 | },
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| 92 | err => {
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| 93 | logger.timeEnd("restore cached provided exports");
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| 94 | if (err) return callback(err);
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| 95 |
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| 96 | /** @type {Set<Module>} */
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| 97 | const modulesToStore = new Set();
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| 98 |
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| 99 | /** @type {Map<Module, Set<Module>>} */
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| 100 | const dependencies = new Map();
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| 101 |
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| 102 | /** @type {Module} */
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| 103 | let module;
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| 104 |
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| 105 | /** @type {ExportsInfo} */
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| 106 | let exportsInfo;
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| 107 |
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| 108 | /** @type {Map<Dependency, ExportsSpec>} */
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| 109 | const exportsSpecsFromDependencies = new Map();
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| 110 |
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| 111 | let cacheable = true;
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| 112 | let changed = false;
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| 113 |
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| 114 | /**
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| 115 | * @param {DependenciesBlock} depBlock the dependencies block
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| 116 | * @returns {void}
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| 117 | */
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| 118 | const processDependenciesBlock = depBlock => {
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| 119 | for (const dep of depBlock.dependencies) {
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| 120 | processDependency(dep);
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| 121 | }
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| 122 | for (const block of depBlock.blocks) {
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| 123 | processDependenciesBlock(block);
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| 124 | }
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| 125 | };
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| 126 |
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| 127 | /**
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| 128 | * @param {Dependency} dep the dependency
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| 129 | * @returns {void}
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| 130 | */
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| 131 | const processDependency = dep => {
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| 132 | const exportDesc = dep.getExports(moduleGraph);
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| 133 | if (!exportDesc) return;
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| 134 | exportsSpecsFromDependencies.set(dep, exportDesc);
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| 135 | };
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| 136 |
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| 137 | /**
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| 138 | * @param {Dependency} dep dependency
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| 139 | * @param {ExportsSpec} exportDesc info
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| 140 | * @returns {void}
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| 141 | */
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| 142 | const processExportsSpec = (dep, exportDesc) => {
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| 143 | const exports = exportDesc.exports;
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| 144 | const globalCanMangle = exportDesc.canMangle;
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| 145 | const globalFrom = exportDesc.from;
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| 146 | const globalPriority = exportDesc.priority;
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| 147 | const globalTerminalBinding =
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| 148 | exportDesc.terminalBinding || false;
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| 149 | const exportDeps = exportDesc.dependencies;
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| 150 | if (exportDesc.hideExports) {
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| 151 | for (const name of exportDesc.hideExports) {
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| 152 | const exportInfo = exportsInfo.getExportInfo(name);
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| 153 | exportInfo.unsetTarget(dep);
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| 154 | }
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| 155 | }
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| 156 | if (exports === true) {
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| 157 | // unknown exports
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| 158 | if (
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| 159 | exportsInfo.setUnknownExportsProvided(
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| 160 | globalCanMangle,
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| 161 | exportDesc.excludeExports,
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| 162 | globalFrom && dep,
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| 163 | globalFrom,
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| 164 | globalPriority
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| 165 | )
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| 166 | ) {
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| 167 | changed = true;
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| 168 | }
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| 169 | } else if (Array.isArray(exports)) {
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| 170 | /**
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| 171 | * merge in new exports
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| 172 | * @param {ExportsInfo} exportsInfo own exports info
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| 173 | * @param {(ExportSpec | string)[]} exports list of exports
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| 174 | */
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| 175 | const mergeExports = (exportsInfo, exports) => {
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| 176 | for (const exportNameOrSpec of exports) {
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| 177 | let name;
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| 178 | let canMangle = globalCanMangle;
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| 179 | let terminalBinding = globalTerminalBinding;
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| 180 | let exports = undefined;
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| 181 | let from = globalFrom;
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| 182 | let fromExport = undefined;
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| 183 | let priority = globalPriority;
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| 184 | let hidden = false;
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| 185 | if (typeof exportNameOrSpec === "string") {
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| 186 | name = exportNameOrSpec;
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| 187 | } else {
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| 188 | name = exportNameOrSpec.name;
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| 189 | if (exportNameOrSpec.canMangle !== undefined)
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| 190 | canMangle = exportNameOrSpec.canMangle;
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| 191 | if (exportNameOrSpec.export !== undefined)
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| 192 | fromExport = exportNameOrSpec.export;
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| 193 | if (exportNameOrSpec.exports !== undefined)
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| 194 | exports = exportNameOrSpec.exports;
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| 195 | if (exportNameOrSpec.from !== undefined)
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| 196 | from = exportNameOrSpec.from;
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| 197 | if (exportNameOrSpec.priority !== undefined)
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| 198 | priority = exportNameOrSpec.priority;
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| 199 | if (exportNameOrSpec.terminalBinding !== undefined)
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| 200 | terminalBinding = exportNameOrSpec.terminalBinding;
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| 201 | if (exportNameOrSpec.hidden !== undefined)
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| 202 | hidden = exportNameOrSpec.hidden;
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| 203 | }
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| 204 | const exportInfo = exportsInfo.getExportInfo(name);
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| 205 |
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| 206 | if (
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| 207 | exportInfo.provided === false ||
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| 208 | exportInfo.provided === null
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| 209 | ) {
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| 210 | exportInfo.provided = true;
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| 211 | changed = true;
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| 212 | }
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| 213 |
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| 214 | if (
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| 215 | exportInfo.canMangleProvide !== false &&
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| 216 | canMangle === false
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| 217 | ) {
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| 218 | exportInfo.canMangleProvide = false;
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| 219 | changed = true;
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| 220 | }
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| 221 |
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| 222 | if (terminalBinding && !exportInfo.terminalBinding) {
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| 223 | exportInfo.terminalBinding = true;
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| 224 | changed = true;
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| 225 | }
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| 226 |
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| 227 | if (exports) {
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| 228 | const nestedExportsInfo =
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| 229 | exportInfo.createNestedExportsInfo();
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| 230 | mergeExports(nestedExportsInfo, exports);
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| 231 | }
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| 232 |
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| 233 | if (
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| 234 | from &&
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| 235 | (hidden
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| 236 | ? exportInfo.unsetTarget(dep)
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| 237 | : exportInfo.setTarget(
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| 238 | dep,
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| 239 | from,
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| 240 | fromExport === undefined ? [name] : fromExport,
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| 241 | priority
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| 242 | ))
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| 243 | ) {
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| 244 | changed = true;
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| 245 | }
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| 246 |
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| 247 | // Recalculate target exportsInfo
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| 248 | const target = exportInfo.getTarget(moduleGraph);
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| 249 | let targetExportsInfo = undefined;
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| 250 | if (target) {
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| 251 | const targetModuleExportsInfo =
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| 252 | moduleGraph.getExportsInfo(target.module);
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| 253 | targetExportsInfo =
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| 254 | targetModuleExportsInfo.getNestedExportsInfo(
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| 255 | target.export
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| 256 | );
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| 257 | // add dependency for this module
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| 258 | const set = dependencies.get(target.module);
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| 259 | if (set === undefined) {
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| 260 | dependencies.set(target.module, new Set([module]));
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| 261 | } else {
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| 262 | set.add(module);
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| 263 | }
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| 264 | }
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| 265 |
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| 266 | if (exportInfo.exportsInfoOwned) {
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| 267 | if (
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| 268 | exportInfo.exportsInfo.setRedirectNamedTo(
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| 269 | targetExportsInfo
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| 270 | )
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| 271 | ) {
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| 272 | changed = true;
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| 273 | }
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| 274 | } else if (
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| 275 | exportInfo.exportsInfo !== targetExportsInfo
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| 276 | ) {
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| 277 | exportInfo.exportsInfo = targetExportsInfo;
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| 278 | changed = true;
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| 279 | }
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| 280 | }
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| 281 | };
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| 282 | mergeExports(exportsInfo, exports);
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| 283 | }
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| 284 | // store dependencies
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| 285 | if (exportDeps) {
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| 286 | cacheable = false;
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| 287 | for (const exportDependency of exportDeps) {
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| 288 | // add dependency for this module
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| 289 | const set = dependencies.get(exportDependency);
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| 290 | if (set === undefined) {
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| 291 | dependencies.set(exportDependency, new Set([module]));
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| 292 | } else {
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| 293 | set.add(module);
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| 294 | }
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| 295 | }
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| 296 | }
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| 297 | };
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| 298 |
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| 299 | const notifyDependencies = () => {
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| 300 | const deps = dependencies.get(module);
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| 301 | if (deps !== undefined) {
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| 302 | for (const dep of deps) {
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| 303 | queue.enqueue(dep);
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| 304 | }
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| 305 | }
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| 306 | };
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| 307 |
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| 308 | logger.time("figure out provided exports");
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| 309 | while (queue.length > 0) {
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| 310 | module = queue.dequeue();
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| 311 |
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| 312 | statQueueItemsProcessed++;
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| 313 |
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| 314 | exportsInfo = moduleGraph.getExportsInfo(module);
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| 315 |
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| 316 | cacheable = true;
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| 317 | changed = false;
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| 318 |
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| 319 | exportsSpecsFromDependencies.clear();
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| 320 | moduleGraph.freeze();
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| 321 | processDependenciesBlock(module);
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| 322 | moduleGraph.unfreeze();
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| 323 | for (const [
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| 324 | dep,
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| 325 | exportsSpec
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| 326 | ] of exportsSpecsFromDependencies) {
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| 327 | processExportsSpec(dep, exportsSpec);
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| 328 | }
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| 329 |
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| 330 | if (cacheable) {
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| 331 | modulesToStore.add(module);
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| 332 | }
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| 333 |
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| 334 | if (changed) {
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| 335 | notifyDependencies();
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| 336 | }
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| 337 | }
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| 338 | logger.timeEnd("figure out provided exports");
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| 339 |
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| 340 | logger.log(
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| 341 | `${Math.round(
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| 342 | (100 * (statFlaggedUncached + statNotCached)) /
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| 343 | (statRestoredFromCache +
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| 344 | statNotCached +
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| 345 | statFlaggedUncached +
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| 346 | statNoExports)
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| 347 | )}% of exports of modules have been determined (${statNoExports} no declared exports, ${statNotCached} not cached, ${statFlaggedUncached} flagged uncacheable, ${statRestoredFromCache} from cache, ${
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| 348 | statQueueItemsProcessed -
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| 349 | statNotCached -
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| 350 | statFlaggedUncached
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| 351 | } additional calculations due to dependencies)`
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| 352 | );
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| 353 |
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| 354 | logger.time("store provided exports into cache");
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| 355 | asyncLib.each(
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| 356 | modulesToStore,
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| 357 | (module, callback) => {
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| 358 | if (
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| 359 | module.buildInfo.cacheable !== true ||
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| 360 | typeof module.buildInfo.hash !== "string"
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| 361 | ) {
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| 362 | // not cacheable
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| 363 | return callback();
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| 364 | }
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| 365 | cache.store(
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| 366 | module.identifier(),
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| 367 | module.buildInfo.hash,
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| 368 | moduleGraph
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| 369 | .getExportsInfo(module)
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| 370 | .getRestoreProvidedData(),
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| 371 | callback
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| 372 | );
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| 373 | },
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| 374 | err => {
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| 375 | logger.timeEnd("store provided exports into cache");
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| 376 | callback(err);
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| 377 | }
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| 378 | );
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| 379 | }
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| 380 | );
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| 381 | }
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| 382 | );
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| 383 |
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| 384 | /** @type {WeakMap<Module, any>} */
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| 385 | const providedExportsCache = new WeakMap();
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| 386 | compilation.hooks.rebuildModule.tap(
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| 387 | "FlagDependencyExportsPlugin",
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| 388 | module => {
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| 389 | providedExportsCache.set(
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| 390 | module,
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| 391 | moduleGraph.getExportsInfo(module).getRestoreProvidedData()
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| 392 | );
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| 393 | }
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| 394 | );
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| 395 | compilation.hooks.finishRebuildingModule.tap(
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| 396 | "FlagDependencyExportsPlugin",
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| 397 | module => {
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| 398 | moduleGraph
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| 399 | .getExportsInfo(module)
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| 400 | .restoreProvided(providedExportsCache.get(module));
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| 401 | }
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| 402 | );
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| 403 | }
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| 404 | );
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| 405 | }
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| 406 | }
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| 407 |
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| 408 | module.exports = FlagDependencyExportsPlugin;
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