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export interface IFlagMetadata{    campaignId:string    variationGroupId:string    variationId: string    isReference: boolean    campaignType: string    slug?:string|null}
export class FlagMetadata implements IFlagMetadata {  campaignId:string  variationGroupId:string  variationId: string  isReference: boolean  campaignType: string  slug?: string | null | undefined  constructor (flagMetadata: Omit<IFlagMetadata, 'toJSON'>) {    const { campaignId, variationGroupId, variationId, isReference, campaignType, slug } = flagMetadata    this.campaignId = campaignId    this.variationGroupId = variationGroupId    this.variationId = variationId    this.isReference = isReference    this.campaignType = campaignType    this.slug = slug  }
  public static Empty ():IFlagMetadata {    return new FlagMetadata({      campaignId: '',      campaignType: '',      variationId: '',      variationGroupId: '',      isReference: false,      slug: null    })  }}