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OccurrenceModuleIdsPlugin.js
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Wed, Feb 19, 09:58

OccurrenceModuleIdsPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { validate } = require("schema-utils");
const schema = require("../../schemas/plugins/ids/OccurrenceModuleIdsPlugin.json");
const {
compareModulesByPreOrderIndexOrIdentifier
} = require("../util/comparators");
const { assignAscendingModuleIds } = require("./IdHelpers");
/** @typedef {import("../../declarations/plugins/ids/OccurrenceModuleIdsPlugin").OccurrenceModuleIdsPluginOptions} OccurrenceModuleIdsPluginOptions */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../ModuleGraphConnection")} ModuleGraphConnection */
class OccurrenceModuleIdsPlugin {
/**
* @param {OccurrenceModuleIdsPluginOptions=} options options object
*/
constructor(options = {}) {
validate(schema, options, {
name: "Occurrence Order Module Ids Plugin",
baseDataPath: "options"
});
this.options = options;
}
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
const prioritiseInitial = this.options.prioritiseInitial;
compiler.hooks.compilation.tap("OccurrenceModuleIdsPlugin", compilation => {
const moduleGraph = compilation.moduleGraph;
compilation.hooks.moduleIds.tap("OccurrenceModuleIdsPlugin", modules => {
const chunkGraph = compilation.chunkGraph;
const modulesInOccurrenceOrder = Array.from(modules).filter(
m =>
m.needId &&
chunkGraph.getNumberOfModuleChunks(m) > 0 &&
chunkGraph.getModuleId(m) === null
);
const occursInInitialChunksMap = new Map();
const occursInAllChunksMap = new Map();
const initialChunkChunkMap = new Map();
const entryCountMap = new Map();
for (const m of modulesInOccurrenceOrder) {
let initial = 0;
let entry = 0;
for (const c of chunkGraph.getModuleChunksIterable(m)) {
if (c.canBeInitial()) initial++;
if (chunkGraph.isEntryModuleInChunk(m, c)) entry++;
}
initialChunkChunkMap.set(m, initial);
entryCountMap.set(m, entry);
}
/**
* @param {Iterable<ModuleGraphConnection>} connections connections
* @returns {number} count of occurs
*/
const countOccursInEntry = connections => {
let sum = 0;
for (const c of connections) {
if (!c.isTargetActive(undefined)) continue;
if (!c.originModule) continue;
sum += initialChunkChunkMap.get(c.originModule);
}
return sum;
};
/**
* @param {Iterable<ModuleGraphConnection>} connections connections
* @returns {number} count of occurs
*/
const countOccurs = connections => {
let sum = 0;
for (const c of connections) {
if (!c.isTargetActive(undefined)) continue;
if (!c.originModule) continue;
if (!c.dependency) continue;
const factor = c.dependency.getNumberOfIdOccurrences();
if (factor === 0) continue;
sum += factor * chunkGraph.getNumberOfModuleChunks(c.originModule);
}
return sum;
};
if (prioritiseInitial) {
for (const m of modulesInOccurrenceOrder) {
const result =
countOccursInEntry(moduleGraph.getIncomingConnections(m)) +
initialChunkChunkMap.get(m) +
entryCountMap.get(m);
occursInInitialChunksMap.set(m, result);
}
}
for (const m of modules) {
const result =
countOccurs(moduleGraph.getIncomingConnections(m)) +
chunkGraph.getNumberOfModuleChunks(m) +
entryCountMap.get(m);
occursInAllChunksMap.set(m, result);
}
const naturalCompare = compareModulesByPreOrderIndexOrIdentifier(
compilation.moduleGraph
);
modulesInOccurrenceOrder.sort((a, b) => {
if (prioritiseInitial) {
const aEntryOccurs = occursInInitialChunksMap.get(a);
const bEntryOccurs = occursInInitialChunksMap.get(b);
if (aEntryOccurs > bEntryOccurs) return -1;
if (aEntryOccurs < bEntryOccurs) return 1;
}
const aOccurs = occursInAllChunksMap.get(a);
const bOccurs = occursInAllChunksMap.get(b);
if (aOccurs > bOccurs) return -1;
if (aOccurs < bOccurs) return 1;
return naturalCompare(a, b);
});
assignAscendingModuleIds(modulesInOccurrenceOrder, compilation);
});
});
}
}
module.exports = OccurrenceModuleIdsPlugin;

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