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 FileExistsPlugin {
    /**
     * @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);
        const fs = resolver.fileSystem;
        resolver
            .getHook(this.source)
            .tapAsync("FileExistsPlugin", (request, resolveContext, callback) => {
                const file = request.path;
                if (!file) return callback();
                fs.stat(file, (err, stat) => {
                    if (err || !stat) {
                        if (resolveContext.missingDependencies)
                            resolveContext.missingDependencies.add(file);
                        if (resolveContext.log) resolveContext.log(file + " doesn't exist");
                        return callback();
                    }
                    if (!stat.isFile()) {
                        if (resolveContext.missingDependencies)
                            resolveContext.missingDependencies.add(file);
                        if (resolveContext.log) resolveContext.log(file + " is not a file");
                        return callback();
                    }
                    if (resolveContext.fileDependencies)
                        resolveContext.fileDependencies.add(file);
                    resolver.doResolve(
                        target,
                        request,
                        "existing file: " + file,
                        resolveContext,
                        callback
                    );
                });
            });
    }
};