All files / src/app/shared/formly/dev/testing formly-testing-utils.ts

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import { FormlyFieldConfig } from '@ngx-formly/core';
 
type ValueOrArray<T> = T | ValueOrArray<T>[];
 
export function extractKeys(fieldConfig: FormlyFieldConfig[]): ValueOrArray<string> {
  if (!fieldConfig) {
    return;
  }
  return fieldConfig.map(field => (field.key as string) ?? extractKeys(field.fieldGroup)).filter(value => !!value);
}