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// data typeexport type DataType<T> = {	key: string|number	value: T}
// singly linked list node classexport type NodeType = {	data: DataType<any>	next: null|NodeType}|null export class Node {	public data: DataType<any>	public next: NodeType|null = null
	constructor(data: DataType<any>) {		this.data = data;		this.next = null;	}}
// singly linked list interfaceexport interface LinkedListApi {	size: number;	prepend(data: DataType<any>): boolean;	append(data: DataType<any>): boolean;	add(data: DataType<any>, position: number): boolean;	getFromHead(): object|false;	getFromTail(): object|false;	print(): void;	remove(key: string|number): object|boolean;	update(key: string|number, newValue: any): object|boolean;	search(key: string|number): object|null}