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export type DataType<T> = {	key: string	value: T}
// singly linked list node classexport type BlockType = {	index: number	data: DataType<any>	time: Date	hash: string	prevHash: null|string}|null
// singly linked list interfaceexport interface BlockChainApi {	length: number	createBlock(data: any): boolean	search(key: string): boolean|BlockType	latestBlock(): boolean|BlockType	log(): void;	iterator(): Generator	checkValidation(): boolean}