优化

‘liusuyi’

2023-10-21 ae92b6823499cfab77201b4033922fa373fb37a3

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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
    Author Tobias Koppers @sokra
*/
"use strict";
 
module.exports = class FileExistsPlugin {
    constructor(source, target) {
        this.source = source;
        this.target = target;
    }
 
    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;
                fs.stat(file, (err, stat) => {
                    if (err || !stat) {
                        if (resolveContext.missing) resolveContext.missing.add(file);
                        if (resolveContext.log) resolveContext.log(file + " doesn't exist");
                        return callback();
                    }
                    if (!stat.isFile()) {
                        if (resolveContext.missing) resolveContext.missing.add(file);
                        if (resolveContext.log) resolveContext.log(file + " is not a file");
                        return callback();
                    }
                    resolver.doResolve(
                        target,
                        request,
                        "existing file: " + file,
                        resolveContext,
                        callback
                    );
                });
            });
    }
};