Allows the use of keyof MyType type declarations in methods accepting the keys of the entries when transformed using this pipe in an *ngFor loop.

KeyValueEntriesPipe.ts

/**
 * Transforms Object into an array of key value pairs.
 */
@Pipe({ name: 'entries' })
export class KeyValueEntriesPipe implements PipeTransform {
  transform<T extends { [p in keyof T]: T[keyof T] }>(input: T): { key: keyof T, value: T[keyof T] }[] {
    const entries: { key: keyof T, value: T[keyof T] }[] = [];
    for (const key in input) {
      if (input.hasOwnProperty(key)) {
        entries.push({ key, value: input[key] });
      }
    }
    return entries;
  }
}