PrimeNG Table - Typing for Templates

PrimeTableRowTypeGuardDirective.ts

/* Credit goes to Alain Boudard, only thanks to his article I understood how that works
 * Link: https://coco-boudard.medium.com/typing-angular-primeng-table-templates-columns-e7859df76f9b
 */

import { Directive, input } from '@angular/core'
import { TableTemplates } from 'primeng/table'

type PTableTemplate<T extends keyof TableTemplates> = Parameters<TableTemplates[T]>[0]
type TableRowTemplateContext<TItem extends object, TName extends keyof TableTemplates> = {
  $implicit: TItem
} & Omit<PTableTemplate<TName>, '$implicit'>

@Directive({
  standalone: true,
  // eslint-disable-next-line @angular-eslint/directive-selector
  selector: 'ng-template[primeTableRowTypeGuard]',
})

export class PrimeTableRowTypeGuardDirective<TItem extends object, TName extends keyof TableTemplates> {

  items = input.required<TItem[]>({ alias: 'primeTableRowTypeGuard' })
  templateName = input.required<TName>({ alias: 'pTemplate' })

  static ngTemplateContextGuard<TContextItem extends object, TContextName extends keyof TableTemplates>(
    dir: PrimeTableRowTypeGuardDirective<TContextItem, TContextName>,
    ctx: unknown,
  ): ctx is TableRowTemplateContext<TContextItem, TContextName> {
    return true
  }
}