FileExistsPlugin.js
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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
);
});
});
}
};