Upgrading Azure Functions from V3 to V4 with JavaScript and TypeScript Files

Question

How can the Azure Function version be upgraded from V3 to V4 when both JavaScript and TypeScript files are maintained in the same folder structure? Below is the folder structure for the V3 model.

Additionally, how should the path value for the main key in the package.json file be specified for the Azure Function V4 model when both JavaScript and TypeScript files are present?

"main": "src/functions/*.js"

Answer 1

Hello @tpp

To upgrade Azure Functions from V3 to V4 when both JavaScript and TypeScript files are maintained in the same folder structure, you can follow the 7-steps below:

1. Upgrade the Azure Functions Core Tools to the latest version.
2. Update the azure-functions package to the latest version in the package.json file.
3. Update the tsconfig.json file to target the latest version of TypeScript.
4. Update the function.json files to use the latest version of the bindings.
5. Update the host.json file to use the latest version of the runtime.
6. Update the package.json file to include the build script to transpile TypeScript files to JavaScript files.
7. Update the main key in the package.json file to point to the JavaScript files generated by the build script.

Regarding the path value for the main key in the package.json file for the Azure Function V4 model when both JavaScript and TypeScript files are present, you can specify it as follows:

"main": "dist/functions/index.js"

This assumes that the build script transpiles the TypeScript files to JavaScript files in the dist folder and the entry point for the Azure Function is in the index.js file under the functions folder. You can adjust the path value based on your specific folder structure and entry point.

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