`vercel` cli has not option to update existing values about vercel

[bombillazo]

We've programmed some commands for that, but its not ideal and introduces more room for errors and intermediate states if something fails. A simple update flag would be the best way to handle it for our case.

[hussamkhatib]

While not ideal, you could remove the env variable vercel env rm and then add the new value.

[mountainash]

I also have the same problem... it would be great is there was a --yes argument (that is also used on env pull and env rm to skip the confirmation/warning that the variable already exists.

[mountainash]

I started looking into raising a PR to add this functionality and found that the Vercel API endpoint for create does allow for overriding if the KEY already exists with an upsert param.

There is also (for interest) another endpoint for "editing" an existing env var when it exists, but you need to know it's ID, not the envvar name/key (so you need to do a map first.

So it shouldn't be too much extra to change this in Vercel CLI.

[mountainash]

What's interesting/strange/confusing is that when you attempt to vercel env add with an existing key, the CLI error is:

Error: Another Environment Variable with the same Name and Environment exists in your project. Remove it or choose a different Name or Environment.

Yet, I can't find this error message in the CLI codebase (this project), I thought maybe the API is returning this error, yet trying to create a new envar Key that already exists returns the following error from the API (https://api.vercel.com/v10/projects/${projectID}/env):

{
  "error": {
    "code": "ENV_CONFLICT",
    "message": "A variable with the name `API_URL` and target `preview` already exists",
    "key": "key",
    "envVarKey": "API_URL"
  },
  "failed": [
    {
      "error": {
        "code": "ENV_CONFLICT",
        "message": "A variable with the name `API_URL` and target `preview` already exists",
        "key": "key",
        "envVarKey": "API_URL"
      }
    }
  ]
}

I'll keep digging to see where the CLI's error is coming from (could be using an older endpoint)...

Update

Endpoint v9 is returning the error below when trying to set an existing env Key. v9 also doesn't allow the "upsert" para... so CLI will need updating to use v10 of this endpoint.

{
  "error": {
    "code": "ENV_ALREADY_EXISTS",
    "message": "Another Environment Variable with the same Name and Environment exists in your project. Remove it or choose a different Name or Environment.",
    "key": "API_URL",
    "configurationId": null,
    "target": [
      "preview"
    ]
  }
}

Update 2

CLI is using v8:
const url = /v8/projects/${projectId}/env;

[bombillazo]

Awesome work!