diff options
Diffstat (limited to 'node_modules/webpack/lib/optimize/MangleExportsPlugin.js')
| -rw-r--r-- | node_modules/webpack/lib/optimize/MangleExportsPlugin.js | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/node_modules/webpack/lib/optimize/MangleExportsPlugin.js b/node_modules/webpack/lib/optimize/MangleExportsPlugin.js deleted file mode 100644 index 30884448..00000000 --- a/node_modules/webpack/lib/optimize/MangleExportsPlugin.js +++ /dev/null @@ -1,177 +0,0 @@ -/* - MIT License http://www.opensource.org/licenses/mit-license.php - Author Tobias Koppers @sokra -*/ - -"use strict"; - -const { UsageState } = require("../ExportsInfo"); -const { - numberToIdentifier, - NUMBER_OF_IDENTIFIER_START_CHARS, - NUMBER_OF_IDENTIFIER_CONTINUATION_CHARS -} = require("../Template"); -const { assignDeterministicIds } = require("../ids/IdHelpers"); -const { compareSelect, compareStringsNumeric } = require("../util/comparators"); - -/** @typedef {import("../Compiler")} Compiler */ -/** @typedef {import("../ExportsInfo")} ExportsInfo */ -/** @typedef {import("../ExportsInfo").ExportInfo} ExportInfo */ - -/** - * @param {ExportsInfo} exportsInfo exports info - * @returns {boolean} mangle is possible - */ -const canMangle = exportsInfo => { - if (exportsInfo.otherExportsInfo.getUsed(undefined) !== UsageState.Unused) - return false; - let hasSomethingToMangle = false; - for (const exportInfo of exportsInfo.exports) { - if (exportInfo.canMangle === true) { - hasSomethingToMangle = true; - } - } - return hasSomethingToMangle; -}; - -// Sort by name -const comparator = compareSelect(e => e.name, compareStringsNumeric); -/** - * @param {boolean} deterministic use deterministic names - * @param {ExportsInfo} exportsInfo exports info - * @param {boolean | undefined} isNamespace is namespace object - * @returns {void} - */ -const mangleExportsInfo = (deterministic, exportsInfo, isNamespace) => { - if (!canMangle(exportsInfo)) return; - const usedNames = new Set(); - /** @type {ExportInfo[]} */ - const mangleableExports = []; - - // Avoid to renamed exports that are not provided when - // 1. it's not a namespace export: non-provided exports can be found in prototype chain - // 2. there are other provided exports and deterministic mode is chosen: - // non-provided exports would break the determinism - let avoidMangleNonProvided = !isNamespace; - if (!avoidMangleNonProvided && deterministic) { - for (const exportInfo of exportsInfo.ownedExports) { - if (exportInfo.provided !== false) { - avoidMangleNonProvided = true; - break; - } - } - } - for (const exportInfo of exportsInfo.ownedExports) { - const name = exportInfo.name; - if (!exportInfo.hasUsedName()) { - if ( - // Can the export be mangled? - exportInfo.canMangle !== true || - // Never rename 1 char exports - (name.length === 1 && /^[a-zA-Z0-9_$]/.test(name)) || - // Don't rename 2 char exports in deterministic mode - (deterministic && - name.length === 2 && - /^[a-zA-Z_$][a-zA-Z0-9_$]|^[1-9][0-9]/.test(name)) || - // Don't rename exports that are not provided - (avoidMangleNonProvided && exportInfo.provided !== true) - ) { - exportInfo.setUsedName(name); - usedNames.add(name); - } else { - mangleableExports.push(exportInfo); - } - } - if (exportInfo.exportsInfoOwned) { - const used = exportInfo.getUsed(undefined); - if ( - used === UsageState.OnlyPropertiesUsed || - used === UsageState.Unused - ) { - mangleExportsInfo(deterministic, exportInfo.exportsInfo, false); - } - } - } - if (deterministic) { - assignDeterministicIds( - mangleableExports, - e => e.name, - comparator, - (e, id) => { - const name = numberToIdentifier(id); - const size = usedNames.size; - usedNames.add(name); - if (size === usedNames.size) return false; - e.setUsedName(name); - return true; - }, - [ - NUMBER_OF_IDENTIFIER_START_CHARS, - NUMBER_OF_IDENTIFIER_START_CHARS * - NUMBER_OF_IDENTIFIER_CONTINUATION_CHARS - ], - NUMBER_OF_IDENTIFIER_CONTINUATION_CHARS, - usedNames.size - ); - } else { - const usedExports = []; - const unusedExports = []; - for (const exportInfo of mangleableExports) { - if (exportInfo.getUsed(undefined) === UsageState.Unused) { - unusedExports.push(exportInfo); - } else { - usedExports.push(exportInfo); - } - } - usedExports.sort(comparator); - unusedExports.sort(comparator); - let i = 0; - for (const list of [usedExports, unusedExports]) { - for (const exportInfo of list) { - let name; - do { - name = numberToIdentifier(i++); - } while (usedNames.has(name)); - exportInfo.setUsedName(name); - } - } - } -}; - -class MangleExportsPlugin { - /** - * @param {boolean} deterministic use deterministic names - */ - constructor(deterministic) { - this._deterministic = deterministic; - } - /** - * Apply the plugin - * @param {Compiler} compiler the compiler instance - * @returns {void} - */ - apply(compiler) { - const { _deterministic: deterministic } = this; - compiler.hooks.compilation.tap("MangleExportsPlugin", compilation => { - const moduleGraph = compilation.moduleGraph; - compilation.hooks.optimizeCodeGeneration.tap( - "MangleExportsPlugin", - modules => { - if (compilation.moduleMemCaches) { - throw new Error( - "optimization.mangleExports can't be used with cacheUnaffected as export mangling is a global effect" - ); - } - for (const module of modules) { - const isNamespace = - module.buildMeta && module.buildMeta.exportsType === "namespace"; - const exportsInfo = moduleGraph.getExportsInfo(module); - mangleExportsInfo(deterministic, exportsInfo, isNamespace); - } - } - ); - }); - } -} - -module.exports = MangleExportsPlugin; |