diff options
Diffstat (limited to 'node_modules/webpack/lib/optimize/SideEffectsFlagPlugin.js')
| -rw-r--r-- | node_modules/webpack/lib/optimize/SideEffectsFlagPlugin.js | 352 |
1 files changed, 0 insertions, 352 deletions
diff --git a/node_modules/webpack/lib/optimize/SideEffectsFlagPlugin.js b/node_modules/webpack/lib/optimize/SideEffectsFlagPlugin.js deleted file mode 100644 index 5db780c..0000000 --- a/node_modules/webpack/lib/optimize/SideEffectsFlagPlugin.js +++ /dev/null @@ -1,352 +0,0 @@ -/* - MIT License http://www.opensource.org/licenses/mit-license.php - Author Tobias Koppers @sokra -*/ -"use strict"; - -const mm = require("micromatch"); -const HarmonyExportImportedSpecifierDependency = require("../dependencies/HarmonyExportImportedSpecifierDependency"); -const HarmonyImportSideEffectDependency = require("../dependencies/HarmonyImportSideEffectDependency"); -const HarmonyImportSpecifierDependency = require("../dependencies/HarmonyImportSpecifierDependency"); - -/** @typedef {import("../Module")} Module */ -/** @typedef {import("../Dependency")} Dependency */ - -/** - * @typedef {Object} ExportInModule - * @property {Module} module the module - * @property {string} exportName the name of the export - * @property {boolean} checked if the export is conditional - */ - -/** - * @typedef {Object} ReexportInfo - * @property {Map<string, ExportInModule[]>} static - * @property {Map<Module, Set<string>>} dynamic - */ - -/** - * @param {ReexportInfo} info info object - * @param {string} exportName name of export - * @returns {ExportInModule | undefined} static export - */ -const getMappingFromInfo = (info, exportName) => { - const staticMappings = info.static.get(exportName); - if (staticMappings !== undefined) { - if (staticMappings.length === 1) return staticMappings[0]; - return undefined; - } - const dynamicMappings = Array.from(info.dynamic).filter( - ([_, ignored]) => !ignored.has(exportName) - ); - if (dynamicMappings.length === 1) { - return { - module: dynamicMappings[0][0], - exportName, - checked: true - }; - } - return undefined; -}; - -/** - * @param {ReexportInfo} info info object - * @param {string} exportName name of export of source module - * @param {Module} module the target module - * @param {string} innerExportName name of export of target module - * @param {boolean} checked true, if existence of target module is checked - */ -const addStaticReexport = ( - info, - exportName, - module, - innerExportName, - checked -) => { - let mappings = info.static.get(exportName); - if (mappings !== undefined) { - for (const mapping of mappings) { - if (mapping.module === module && mapping.exportName === innerExportName) { - mapping.checked = mapping.checked && checked; - return; - } - } - } else { - mappings = []; - info.static.set(exportName, mappings); - } - mappings.push({ - module, - exportName: innerExportName, - checked - }); -}; - -/** - * @param {ReexportInfo} info info object - * @param {Module} module the reexport module - * @param {Set<string>} ignored ignore list - * @returns {void} - */ -const addDynamicReexport = (info, module, ignored) => { - const existingList = info.dynamic.get(module); - if (existingList !== undefined) { - for (const key of existingList) { - if (!ignored.has(key)) existingList.delete(key); - } - } else { - info.dynamic.set(module, new Set(ignored)); - } -}; - -class SideEffectsFlagPlugin { - apply(compiler) { - compiler.hooks.normalModuleFactory.tap("SideEffectsFlagPlugin", nmf => { - nmf.hooks.module.tap("SideEffectsFlagPlugin", (module, data) => { - const resolveData = data.resourceResolveData; - if ( - resolveData && - resolveData.descriptionFileData && - resolveData.relativePath - ) { - const sideEffects = resolveData.descriptionFileData.sideEffects; - const hasSideEffects = SideEffectsFlagPlugin.moduleHasSideEffects( - resolveData.relativePath, - sideEffects - ); - if (!hasSideEffects) { - module.factoryMeta.sideEffectFree = true; - } - } - - return module; - }); - nmf.hooks.module.tap("SideEffectsFlagPlugin", (module, data) => { - if (data.settings.sideEffects === false) { - module.factoryMeta.sideEffectFree = true; - } else if (data.settings.sideEffects === true) { - module.factoryMeta.sideEffectFree = false; - } - }); - }); - compiler.hooks.compilation.tap("SideEffectsFlagPlugin", compilation => { - compilation.hooks.optimizeDependencies.tap( - "SideEffectsFlagPlugin", - modules => { - /** @type {Map<Module, ReexportInfo>} */ - const reexportMaps = new Map(); - - // Capture reexports of sideEffectFree modules - for (const module of modules) { - /** @type {Dependency[]} */ - const removeDependencies = []; - for (const dep of module.dependencies) { - if (dep instanceof HarmonyImportSideEffectDependency) { - if (dep.module && dep.module.factoryMeta.sideEffectFree) { - removeDependencies.push(dep); - } - } else if ( - dep instanceof HarmonyExportImportedSpecifierDependency - ) { - if (module.factoryMeta.sideEffectFree) { - const mode = dep.getMode(true); - if ( - mode.type === "safe-reexport" || - mode.type === "checked-reexport" || - mode.type === "dynamic-reexport" || - mode.type === "reexport-non-harmony-default" || - mode.type === "reexport-non-harmony-default-strict" || - mode.type === "reexport-named-default" - ) { - let info = reexportMaps.get(module); - if (!info) { - reexportMaps.set( - module, - (info = { - static: new Map(), - dynamic: new Map() - }) - ); - } - const targetModule = dep._module; - switch (mode.type) { - case "safe-reexport": - for (const [key, id] of mode.map) { - if (id) { - addStaticReexport( - info, - key, - targetModule, - id, - false - ); - } - } - break; - case "checked-reexport": - for (const [key, id] of mode.map) { - if (id) { - addStaticReexport( - info, - key, - targetModule, - id, - true - ); - } - } - break; - case "dynamic-reexport": - addDynamicReexport(info, targetModule, mode.ignored); - break; - case "reexport-non-harmony-default": - case "reexport-non-harmony-default-strict": - case "reexport-named-default": - addStaticReexport( - info, - mode.name, - targetModule, - "default", - false - ); - break; - } - } - } - } - } - } - - // Flatten reexports - for (const info of reexportMaps.values()) { - const dynamicReexports = info.dynamic; - info.dynamic = new Map(); - for (const reexport of dynamicReexports) { - let [targetModule, ignored] = reexport; - for (;;) { - const innerInfo = reexportMaps.get(targetModule); - if (!innerInfo) break; - - for (const [key, reexports] of innerInfo.static) { - if (ignored.has(key)) continue; - for (const { module, exportName, checked } of reexports) { - addStaticReexport(info, key, module, exportName, checked); - } - } - - // Follow dynamic reexport if there is only one - if (innerInfo.dynamic.size !== 1) { - // When there are more then one, we don't know which one - break; - } - - ignored = new Set(ignored); - for (const [innerModule, innerIgnored] of innerInfo.dynamic) { - for (const key of innerIgnored) { - if (ignored.has(key)) continue; - // This reexports ends here - addStaticReexport(info, key, targetModule, key, true); - ignored.add(key); - } - targetModule = innerModule; - } - } - - // Update reexport as all other cases has been handled - addDynamicReexport(info, targetModule, ignored); - } - } - - for (const info of reexportMaps.values()) { - const staticReexports = info.static; - info.static = new Map(); - for (const [key, reexports] of staticReexports) { - for (let mapping of reexports) { - for (;;) { - const innerInfo = reexportMaps.get(mapping.module); - if (!innerInfo) break; - - const newMapping = getMappingFromInfo( - innerInfo, - mapping.exportName - ); - if (!newMapping) break; - mapping = newMapping; - } - addStaticReexport( - info, - key, - mapping.module, - mapping.exportName, - mapping.checked - ); - } - } - } - - // Update imports along the reexports from sideEffectFree modules - for (const pair of reexportMaps) { - const module = pair[0]; - const info = pair[1]; - let newReasons = undefined; - for (let i = 0; i < module.reasons.length; i++) { - const reason = module.reasons[i]; - const dep = reason.dependency; - if ( - (dep instanceof HarmonyExportImportedSpecifierDependency || - (dep instanceof HarmonyImportSpecifierDependency && - !dep.namespaceObjectAsContext)) && - dep._id - ) { - const mapping = getMappingFromInfo(info, dep._id); - if (mapping) { - dep.redirectedModule = mapping.module; - dep.redirectedId = mapping.exportName; - mapping.module.addReason( - reason.module, - dep, - reason.explanation - ? reason.explanation + - " (skipped side-effect-free modules)" - : "(skipped side-effect-free modules)" - ); - // removing the currect reason, by not adding it to the newReasons array - // lazily create the newReasons array - if (newReasons === undefined) { - newReasons = i === 0 ? [] : module.reasons.slice(0, i); - } - continue; - } - } - if (newReasons !== undefined) newReasons.push(reason); - } - if (newReasons !== undefined) { - module.reasons = newReasons; - } - } - } - ); - }); - } - - static moduleHasSideEffects(moduleName, flagValue) { - switch (typeof flagValue) { - case "undefined": - return true; - case "boolean": - return flagValue; - case "string": - if (process.platform === "win32") { - flagValue = flagValue.replace(/\\/g, "/"); - } - return mm.isMatch(moduleName, flagValue, { - matchBase: true - }); - case "object": - return flagValue.some(glob => - SideEffectsFlagPlugin.moduleHasSideEffects(moduleName, glob) - ); - } - } -} -module.exports = SideEffectsFlagPlugin; |