init

马宇豪

2024-07-16 f591c27b57e2418c9495bc02ae8cfff84d35bc18

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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
    Author Tobias Koppers @sokra
*/
 
"use strict";
 
const { STAGE_BASIC, STAGE_ADVANCED } = require("../OptimizationStages");
 
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../Compiler")} Compiler */
 
class RemoveEmptyChunksPlugin {
    /**
     * Apply the plugin
     * @param {Compiler} compiler the compiler instance
     * @returns {void}
     */
    apply(compiler) {
        compiler.hooks.compilation.tap("RemoveEmptyChunksPlugin", compilation => {
            /**
             * @param {Iterable<Chunk>} chunks the chunks array
             * @returns {void}
             */
            const handler = chunks => {
                const chunkGraph = compilation.chunkGraph;
                for (const chunk of chunks) {
                    if (
                        chunkGraph.getNumberOfChunkModules(chunk) === 0 &&
                        !chunk.hasRuntime() &&
                        chunkGraph.getNumberOfEntryModules(chunk) === 0
                    ) {
                        compilation.chunkGraph.disconnectChunk(chunk);
                        compilation.chunks.delete(chunk);
                    }
                }
            };
 
            // TODO do it once
            compilation.hooks.optimizeChunks.tap(
                {
                    name: "RemoveEmptyChunksPlugin",
                    stage: STAGE_BASIC
                },
                handler
            );
            compilation.hooks.optimizeChunks.tap(
                {
                    name: "RemoveEmptyChunksPlugin",
                    stage: STAGE_ADVANCED
                },
                handler
            );
        });
    }
}
module.exports = RemoveEmptyChunksPlugin;