TypeScript Storage Implementation

in-memory-storage.ts

class InMemoryStorage implements Storage {
  private data = new Map<string, string>()

  clear (): void {
    this.data.clear()
  }

  getItem (key: string): string | null {
    return this.data.get(String(key)) ?? null
  }

  removeItem (key: string): void {
    this.data.delete(String(key))
  }

  key (index: number): string | null {
    return [...this.data.keys()][Number(index)] ?? null
  }

  setItem (key: string, value: string): void {
    this.data.set(String(key), String(value))
  }

  get length (): number {
    return this.data.size
  }
}