How to define entry point of a function that's under a /dist directory?

Question

I’m developing functions using the NodeJS runtime using TypeScript, and my compiled JavaScript code goes to a /dist directory, with the main function residing in index.js. I tried the following configuration in project.yml:

environment: {}
parameters: {}
packages:
  - name: sample
    environment: { }
    parameters: { }
    annotations: { }
    functions:
      - name: hello
        binary: false
        main: 'dist/index.js'
        runtime: 'nodejs:default'
        web: true
        parameters: { }
        environment: { }
        annotations: { }
        limits: { }

It deploys without any apparent issue, but when I try to run the function, it cannot start, and I get the following error in the logs:

"2022-07-24T17:15:51.915241077Z stdout: Action entrypoint 'dist/index.js' is not a function."

If I change the main property to /dist I get something like this:

"2022-07-24T17:21:27.668525053Z stdout: Error: Cannot find module '/tmp/fP5MxYsZ'"

mario.castro.squella · Answer

I managed to solve this myself. It turns out that I had not set the main property in the package.json file to dist/index.js.The main in the project.yml is for setting the name of the entrypoint function in case its name is different than main.

Kwame Opare Asiedu · Answer

@mariocastrosquella

Props to resolving the issue. Typescript on doctl is quite lacking. Aside creating the initial project, there’s nothing more it does unless you are ready to deploy.

I’ve been working on a CLI library which improves the development experience when working with Typescript serverless projects.

It’s called docts. There are some pain points with doctl that docts addresses such as:

No autoupdate of project.yml
Managing different versions of libraries across several function package.jsons

docts addresses these problems by:

Auto-updating project.yml when you add or remove functions to/from your project
Allowing you to install all dependencies at one place (in the project’s package.json)
Providing a build command which builds all your functions to their respective packages/ directories … and more

Feel free to check it out on Github and on NPM

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How to define entry point of a function that's under a /dist directory?

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