how to return a resource from a user defined function?

[chris-kruining]

I am making a library for our bicep and I would like to offer an easy way to query for existing resources. so my idea was to create functions for that:

query.bicep

import { ResourceType, Context } from './types.bicep'
import { name } from './internal/conventions.bicep'

@export()
func resourceGroup(scope object, context Context) resource 'Microsoft.Resources/resourceGroups@2022-09-01' =>
  resource rg 'Microsoft.Resources/resourceGroups@2022-09-01' existing = {
    name: name('resourceGroup', context)
    scope: scope
  }

...

which could then be used like this:

import { Context } from 'br/someAlias:types:1.0.0'
import { staticWebApp, withManagedIdentity, withDefaultSku } from 'br/someAlias:static-web-app:1.0.0'
import * as query from 'br/someAlias:query.bicep:1.0.0'

param context Context

var appConfig = staticWebApp(context, [
  withDefaultSku()
  withManagedIdentity()
])
resource app 'Microsoft.Web/staticSites@2023-01-01' = {
  name: appConfig.name
  parent: query.resourceGroup(subsription(), union(context, { app: 'some-app' }))
  identity: appConfig.identity
  location: appConfig.location
  tags: appConfig.tags
  sku: appConfig.sku
  properties: appConfig.properties
}