source: imaps-frontend/node_modules/webpack/lib/node/NodeEnvironmentPlugin.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Tobias Koppers @sokra
*/

"use strict";

const CachedInputFileSystem = require("enhanced-resolve").CachedInputFileSystem;
const fs = require("graceful-fs");
const createConsoleLogger = require("../logging/createConsoleLogger");
const NodeWatchFileSystem = require("./NodeWatchFileSystem");
const nodeConsole = require("./nodeConsole");

/** @typedef {import("../../declarations/WebpackOptions").InfrastructureLogging} InfrastructureLogging */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../util/fs").InputFileSystem} InputFileSystem */

class NodeEnvironmentPlugin {
        /**
         * @param {object} options options
         * @param {InfrastructureLogging} options.infrastructureLogging infrastructure logging options
         */
        constructor(options) {
                this.options = options;
        }

        /**
         * Apply the plugin
         * @param {Compiler} compiler the compiler instance
         * @returns {void}
         */
        apply(compiler) {
                const { infrastructureLogging } = this.options;
                compiler.infrastructureLogger = createConsoleLogger({
                        level: infrastructureLogging.level || "info",
                        debug: infrastructureLogging.debug || false,
                        console:
                                infrastructureLogging.console ||
                                nodeConsole({
                                        colors: infrastructureLogging.colors,
                                        appendOnly: infrastructureLogging.appendOnly,
                                        stream:
                                                /** @type {NodeJS.WritableStream} */
                                                (infrastructureLogging.stream)
                                })
                });
                compiler.inputFileSystem = new CachedInputFileSystem(fs, 60000);
                const inputFileSystem =
                        /** @type {InputFileSystem} */
                        (compiler.inputFileSystem);
                compiler.outputFileSystem = fs;
                compiler.intermediateFileSystem = fs;
                compiler.watchFileSystem = new NodeWatchFileSystem(inputFileSystem);
                compiler.hooks.beforeRun.tap("NodeEnvironmentPlugin", compiler => {
                        if (
                                compiler.inputFileSystem === inputFileSystem &&
                                inputFileSystem.purge
                        ) {
                                compiler.fsStartTime = Date.now();
                                inputFileSystem.purge();
                        }
                });
        }
}

module.exports = NodeEnvironmentPlugin;