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rOACCT/node_modules/webpack-dev-middleware/dist/utils/setupOutputFileSystem.js
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setupOutputFileSystem.js
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			"use strict";

			const path = require("path");

			const memfs = require("memfs");
			/** @typedef {import("webpack").MultiCompiler} MultiCompiler */

			/** @typedef {import("../index.js").IncomingMessage} IncomingMessage */

			/** @typedef {import("../index.js").ServerResponse} ServerResponse */

			/**
			* @template {IncomingMessage} Request
			* @template {ServerResponse} Response
			* @param {import("../index.js").Context<Request, Response>} context
			*/


			function setupOutputFileSystem(context) {
			let outputFileSystem;

			if (context.options.outputFileSystem) {
			const {
			outputFileSystem: outputFileSystemFromOptions
			} = context.options; // Todo remove when we drop webpack@4 support

			if (typeof outputFileSystemFromOptions.join !== "function") {
			throw new Error("Invalid options: options.outputFileSystem.join() method is expected");
			} // Todo remove when we drop webpack@4 support
			// @ts-ignore


			if (typeof outputFileSystemFromOptions.mkdirp !== "function") {
			throw new Error("Invalid options: options.outputFileSystem.mkdirp() method is expected");
			}

			outputFileSystem = outputFileSystemFromOptions;
			} else {
			outputFileSystem = memfs.createFsFromVolume(new memfs.Volume()); // TODO: remove when we drop webpack@4 support
			// @ts-ignore

			outputFileSystem.join = path.join.bind(path);
			}

			const compilers =
			/** @type {MultiCompiler} */
			context.compiler.compilers \|\| [context.compiler];

			for (const compiler of compilers) {
			compiler.outputFileSystem = outputFileSystem;
			} // @ts-ignore
			// eslint-disable-next-line no-param-reassign


			context.outputFileSystem = outputFileSystem;
			}

			module.exports = setupOutputFileSystem;