[alias] Support array of string as replacement value

[akphi]

• Rollup Plugin Name: @rollup/plugin-alias
• Rollup Plugin Version: 3.1.1

Feature Use Case

Currently, the alias plugin only support string value for the replacement, not an array. This behavior is different from how other tools (like jest, typescript, webpack) handle aliases.

Feature Proposal

Could we support something like this:

...
plugins: [
    alias({
      // standard config
      entries: [
        { find: 'utils', replacement: ['../../../utils', '../../../utils2'] },
      ]
     // object format
     entries: {
       utils: ['../../../utils', '../../../utils2'],
     }
   })
]

[shellscape]

Thanks for opening an issue. Unfortunately I'm not entirely sure what you're asking for, or what case you're trying to make for a new feature. You might consider rephrasing the text of the issue and making a use case explanation. (Note that mirroring how other libs do something is not typically a good use case)

[akphi]

@shellscape Thanks for the quick response.

So let's say I'm trying to be able to create an alias for more than 2 code locations.

For example, I have my utilities in 2 folders utils and utils2. I want it so that when I type

import { getSomething } from 'utils/GeneralUtil';

rollup knows to look for the GeneralUtil file in 2 places utils and utils2. I'm asking for this because this can be done in Typescript like this:

// tsconfig.json
compilerOptions: {
  paths: {
    "utils/*": ['../../../utils/*', '../../../utils2/*']
  }
}

[shellscape]

I see. What you're really looking for isn't a simple alias, you're actually looking for a change in module resolution - that's the job of plugins like node-resolve. I'd suggest taking a look at https://github.com/bitshiftza/rollup-plugin-ts-paths that might help, or any of the module resolution third party plugins on the awesome repo https://github.com/rollup/awesome#modules.

It's probably also worth saying that this is the first time we've seen this request, and with that it's not likely to gain much traction. A custom plugin to suit this need is probably going to be the way to go for you.

[akphi]

@shellscape even that plugin mentions this in its limitation, but I get the idea. I'll close this now. Thank you so much!

For folks who struggle with the same issue and could not find a workaround, take a look at babel-plugin-module-resolver if you're using babel.

[Madd0g]

hey, I'm sorry to bring this closed issue to life, I'm also interested in the same thing, I'm guessing this is not possible to achieve with the customResolver feature?

I want to find the first folder that has a file - is that not something the customResolver can do?