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";
 
/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
 
module.exports = class DirectoryExistsPlugin {
    /**
     * @param {string | ResolveStepHook} source source
     * @param {string | ResolveStepHook} target target
     */
    constructor(source, target) {
        this.source = source;
        this.target = target;
    }
 
    /**
     * @param {Resolver} resolver the resolver
     * @returns {void}
     */
    apply(resolver) {
        const target = resolver.ensureHook(this.target);
        resolver
            .getHook(this.source)
            .tapAsync(
                "DirectoryExistsPlugin",
                (request, resolveContext, callback) => {
                    const fs = resolver.fileSystem;
                    const directory = request.path;
                    if (!directory) return callback();
                    fs.stat(directory, (err, stat) => {
                        if (err || !stat) {
                            if (resolveContext.missingDependencies)
                                resolveContext.missingDependencies.add(directory);
                            if (resolveContext.log)
                                resolveContext.log(directory + " doesn't exist");
                            return callback();
                        }
                        if (!stat.isDirectory()) {
                            if (resolveContext.missingDependencies)
                                resolveContext.missingDependencies.add(directory);
                            if (resolveContext.log)
                                resolveContext.log(directory + " is not a directory");
                            return callback();
                        }
                        if (resolveContext.fileDependencies)
                            resolveContext.fileDependencies.add(directory);
                        resolver.doResolve(
                            target,
                            request,
                            `existing directory ${directory}`,
                            resolveContext,
                            callback
                        );
                    });
                }
            );
    }
};