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Author(s): @{[ username ]}  Published: {[ TutorialCtrl.tutorial.date_published | date:'mediumDate' ]}

Google Cloud Platform Community tutorials submitted from the community do not represent official Google Cloud Platform product documentation.

Yarn is a package management tool that makes it easy and fast to install npm modules for Node.js.

You can use Yarn to manage your Node.js dependencies on App Engine flexible environment. This tutorials provides a quick demonstration.

Objectives

1. Install Yarn.
2. Manage Node.js dependencies with Yarn.
3. Using Yarn to install dependencies during deployment to App Engine.

Costs

This tutorial uses billable components of Google Cloud Platform, including:

• Google App Engine flexible environment

Use the Pricing Calculator to generate a cost estimate based on your projected usage.

Before you begin

1. Create a project in the Google Cloud Platform Console.
2. Enable billing for your project.
3. Install the Google Cloud SDK.

Getting started

1. Install Yarn by following the installation instructions.

2. To install a package and automatically save it to your package.json run:

   yarn add PACKAGE
   

   For example, to install and save the google-cloud package:

   yarn add google-cloud
   

   Running this command will save the dependency into your package.json, and create a yarn.lock file in the current directory. Don't delete this file! It will track the exact version of every package you need to run your application.

Deploying to App Engine

To use Yarn for your deployments to App Engine flexible environment, all you need is a yarn.lock in your application directory. Then, just deploy:

gcloud app deploy

If App Engine finds a yarn.lock in the application directory, Yarn will be used to perform the npm installation. Learn more about the Node.js runtime for App Engine flexible environment.

And that's it! If you have any other questions about Node.js on Google Cloud Platform, be sure to join us on our Slack channel.

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