$ cat package.json { "name": "sample", "version": "1.0.0", "main": "index.js", "license": "MIT", "dependencies": { "gulp-cache": "^0.4.5", "gulp-debug": "^2.1.2", "gulp-eslint": "^3.0.1", "gulp-size": "^2.1.0" } } yarnもpackage.jsonに対応しているため、 npm install同様(デフォルトでは)node_modulesにモジュールが降ってきます。
![yarnがnpmと何が違うのか試してみた - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/d69d323213b41e1dc5baedfd646b3c02d6758af2/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-9f5428127621718a910c8b63951390ad.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTkxNiZoPTMzNiZ0eHQ9eWFybiVFMyU4MSU4Q25wbSVFMyU4MSVBOCVFNCVCRCU5NSVFMyU4MSU4QyVFOSU4MSU5NSVFMyU4MSU4NiVFMyU4MSVBRSVFMyU4MSU4QiVFOCVBOSVBNiVFMyU4MSU5NyVFMyU4MSVBNiVFMyU4MSVCRiVFMyU4MSU5RiZ0eHQtY29sb3I9JTIzMjEyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTU2JnR4dC1jbGlwPWVsbGlwc2lzJnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnM9NGY5ZDdmOGQ5N2NiZmMwMjI2ODc0ZGMyOWI4NWYxMWM%26mark-x%3D142%26mark-y%3D112%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTYxNiZ0eHQ9JTQwMDgyOSZ0eHQtY29sb3I9JTIzMjEyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTM2JnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnM9YWI1YmM0NzM3MjVmZGNjZjc0MGIzZTIwOWY4ZGMwZjE%26blend-x%3D142%26blend-y%3D491%26blend-mode%3Dnormal%26s%3D184b545df8f6ab60cded5a4678794aa9)