Скачать или смотреть Migrating Azure Functions from Javascript to Typescript - A Complete Guide to Successful Builds

Discover how to seamlessly migrate Azure Functions from Javascript to Typescript. Learn how to set up your project for successful builds and deployments, ensuring a smooth transition.
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Migrating Azure Functions from Javascript to Typescript

Migrating an Azure Function from Javascript to Typescript can be a daunting task, especially when it comes to deploying the updated code. If you're facing issues where your Typescript project is not building correctly during deployment, you're not alone. Then, questions arise like: How do I ensure my Azure Function is properly built and deployed after conversion and avoids issues such as missing build output?

In this guide, we'll explore this common problem and equip you with actionable steps to ensure your Azure Function works flawlessly after your migration to Typescript.

Understanding the Problem

After migrating an Azure Function to Typescript:

You find that it runs locally but fails to build during deployment through the GitHub integration or App Service Build Service.

The output dist folder, where the compiled files should reside, is missing upon inspection, indicating that your build process is not executing as expected.

The apparent hiccup arises primarily due to build commands being absent or misconfigured in your deployment pipeline. Here are the steps you can follow to rectify this situation.

Solution Breakdown

Step 1: Modify the Deployment Command

To ensure that your project builds correctly during deployment, you can manually adjust the deployment script using Kudu (Advanced Tools). Here’s what you need to do:

Access Kudu: Go to the Kudu console associated with your Azure Function App.

Locate the Deployment Script: Find the deploy.cmd file in the deployments tools directory (usually found at C:\home\site\deployments\tools\).

Edit the Script: Open deploy.cmd and add the following lines on line 121:

[[See Video to Reveal this Text or Code Snippet]]

This code ensures that before building your project, the necessary dependencies and Typescript itself are installed.

Step 2: Set Up a GitHub Action for Easier Deployments

If you find the original deployment through Azure App Service slow and sometimes unreliable (leading to timeouts), consider using GitHub Actions to streamline this process. Here’s a basic setup:

Create a YAML File: In your repository, create a file under the .github/workflows/ directory. Name it something like build-and-deploy.yml.

Configuration: Use the following template

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Test the Deployment

Once you've modified the deployment script or set up the GitHub action:

Push your changes to the repository.

Monitor the deployment logs for any errors.

Confirm that the dist directory is created and populated as expected.

Important Notes

Always ensure your package.json and tsconfig.build.json files are correctly configured for Typescript projects.

Regularly test builds locally before deploying to catch errors early.

Conclusion

Migrating from Javascript to Typescript for Azure Functions can present some challenges, particularly when it comes to ensuring that the application builds correctly. By modifying your deployment processes—in either Kudu or a GitHub Action—you can alleviate many common issues that arise from the migration.

Whether you choose manual adjustments or automation through continuous integration, following these steps will help you transition smoothly and keep your Azure Functions performing optimally. Happy coding!