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Merge pull request #4483 from timse/improve-performance-FlagDependencyExportsPlugin 

Improve performance flag dependency exports plugin
This commit is contained in:
Tobias Koppers 2017-03-16 15:27:11 +01:00 committed by GitHub
parent 92c8385aaf 9af70d849c
commit 416e5beeb4
1 changed files with 8 additions and 10 deletions
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18
lib/FlagDependencyExportsPlugin.js
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@ -9,21 +9,24 @@ class FlagDependencyExportsPlugin {
apply(compiler) {
compiler.plugin("compilation", (compilation) => {
compilation.plugin("finish-modules", (modules) => {
const dependencies = Object.create(null);
let module;
let moduleWithExports;
let moduleProvidedExports;
const queue = modules.filter((m) => !m.providedExports);
for(let i = 0; i < queue.length; i++) {
module = queue[i];
if(module.providedExports !== true) {
moduleWithExports = false;
moduleProvidedExports = Array.isArray(module.providedExports) ? new Set(module.providedExports) : new Set();
processDependenciesBlock(module);
if(!moduleWithExports) {
module.providedExports = true;
notifyDependencies();
} else if(module.providedExports !== true) {
module.providedExports = Array.from(moduleProvidedExports);
}
}
}
@ -36,7 +39,7 @@ class FlagDependencyExportsPlugin {
depBlock.blocks.forEach(processDependenciesBlock);
}
function processDependency(dep, usedExports) {
function processDependency(dep) {
const exportDesc = dep.getExports && dep.getExports();
if(!exportDesc) return;
moduleWithExports = true;
@ -65,12 +68,7 @@ class FlagDependencyExportsPlugin {
module.providedExports = true;
changed = true;
} else if(Array.isArray(exports)) {
if(Array.isArray(module.providedExports)) {
changed = addToSet(module.providedExports, exports);
} else {
module.providedExports = exports.slice();
changed = true;
}
changed = addToSet(moduleProvidedExports, exports);
}
}
if(changed) {
@ -89,8 +87,8 @@ class FlagDependencyExportsPlugin {
function addToSet(a, b) {
let changed = false;
b.forEach((item) => {
if(a.indexOf(item) < 0) {
a.push(item);
if(!a.has(item)) {
a.add(item);
changed = true;
}
});