Serverless.json cannot load config variables after update to v4

Serverless Framework
1

I have 3 companies I would like to upgrade to v4, after the update I cannot seem to load variables into the serverless.json (JSON version of serverless.yml). After the update I get this error:


Failed to resolve variable './config/serverlessConfig.js#getEnv.stage' with resolver 'file' and provider 'file': Error: Cannot load or execute JS module "C:\dev\heal-
api\config\serverlessConfig.js": Error [ERR_UNSUPPORTED_ESM_URL_SCHEME]: Only URLs with a scheme in: file, data, and node are supported by the default ESM loader. On Windows, absolute paths must be valid file:// URLs. Received protocol 'c:'

This is a node error I think. I’m running node 20.

My variable comes from a file that exports a function that returns an object.

const config = {
    development:{
                 //variables
 
    } 
}

export function getEnv() {config[process.env.BUILD_ENV]);
    return Object.assign({}, config[process.env.BUILD_ENV]);
    
}

My serverless.json look like this:

{
    "service": "healPay",
    "plugins": [
        "serverless-webpack",
        "serverless-offline",
        "serverless-prune-plugin",
        "serverless-domain-manager"
    ],
    "custom": {
        "customDomain": {
            "certificateName": "${file(./config/serverlessConfig.js):getEnv.certificateName}",
/// rest
2

I’ve never seen this style.

Where’s it documented ?

3

Its been around as an option for a long time, but I don’t think its well documented. I can repost this in yml, but I doubt that has anything todo with it.

4

This looks like the issue is that the serverless-webpack-plugin (and many others) are not yet compatible with V4.