diff options
Diffstat (limited to 'node_modules/webpack/lib/optimize/FlagIncludedChunksPlugin.js')
-rw-r--r-- | node_modules/webpack/lib/optimize/FlagIncludedChunksPlugin.js | 99 |
1 files changed, 0 insertions, 99 deletions
diff --git a/node_modules/webpack/lib/optimize/FlagIncludedChunksPlugin.js b/node_modules/webpack/lib/optimize/FlagIncludedChunksPlugin.js deleted file mode 100644 index 1890f05..0000000 --- a/node_modules/webpack/lib/optimize/FlagIncludedChunksPlugin.js +++ /dev/null @@ -1,99 +0,0 @@ -/* - MIT License http://www.opensource.org/licenses/mit-license.php - Author Tobias Koppers @sokra -*/ -"use strict"; - -class FlagIncludedChunksPlugin { - apply(compiler) { - compiler.hooks.compilation.tap("FlagIncludedChunksPlugin", compilation => { - compilation.hooks.optimizeChunkIds.tap( - "FlagIncludedChunksPlugin", - chunks => { - // prepare two bit integers for each module - // 2^31 is the max number represented as SMI in v8 - // we want the bits distributed this way: - // the bit 2^31 is pretty rar and only one module should get it - // so it has a probability of 1 / modulesCount - // the first bit (2^0) is the easiest and every module could get it - // if it doesn't get a better bit - // from bit 2^n to 2^(n+1) there is a probability of p - // so 1 / modulesCount == p^31 - // <=> p = sqrt31(1 / modulesCount) - // so we use a modulo of 1 / sqrt31(1 / modulesCount) - const moduleBits = new WeakMap(); - const modulesCount = compilation.modules.length; - - // precalculate the modulo values for each bit - const modulo = 1 / Math.pow(1 / modulesCount, 1 / 31); - const modulos = Array.from( - { length: 31 }, - (x, i) => Math.pow(modulo, i) | 0 - ); - - // iterate all modules to generate bit values - let i = 0; - for (const module of compilation.modules) { - let bit = 30; - while (i % modulos[bit] !== 0) { - bit--; - } - moduleBits.set(module, 1 << bit); - i++; - } - - // interate all chunks to generate bitmaps - const chunkModulesHash = new WeakMap(); - for (const chunk of chunks) { - let hash = 0; - for (const module of chunk.modulesIterable) { - hash |= moduleBits.get(module); - } - chunkModulesHash.set(chunk, hash); - } - - for (const chunkA of chunks) { - const chunkAHash = chunkModulesHash.get(chunkA); - const chunkAModulesCount = chunkA.getNumberOfModules(); - if (chunkAModulesCount === 0) continue; - let bestModule = undefined; - for (const module of chunkA.modulesIterable) { - if ( - bestModule === undefined || - bestModule.getNumberOfChunks() > module.getNumberOfChunks() - ) - bestModule = module; - } - loopB: for (const chunkB of bestModule.chunksIterable) { - // as we iterate the same iterables twice - // skip if we find ourselves - if (chunkA === chunkB) continue; - - const chunkBModulesCount = chunkB.getNumberOfModules(); - - // ids for empty chunks are not included - if (chunkBModulesCount === 0) continue; - - // instead of swapping A and B just bail - // as we loop twice the current A will be B and B then A - if (chunkAModulesCount > chunkBModulesCount) continue; - - // is chunkA in chunkB? - - // we do a cheap check for the hash value - const chunkBHash = chunkModulesHash.get(chunkB); - if ((chunkBHash & chunkAHash) !== chunkAHash) continue; - - // compare all modules - for (const m of chunkA.modulesIterable) { - if (!chunkB.containsModule(m)) continue loopB; - } - chunkB.ids.push(chunkA.id); - } - } - } - ); - }); - } -} -module.exports = FlagIncludedChunksPlugin; |