FakeStorage.ts

class FakeStorage implements Storage {
    length: number;
    [key: string]: any;
    [index: number]: string;

    constructor() {
        this.length = 0;
    }

    getItem(key: string): any {
        return this[key];
    }

    setItem(key: string, data: string): void {
        this[key] = data;
        this.length++;
    }

    removeItem(key: string): void {
        delete this[key];
        this.length--;
    }

    key(index: number): string {
        // not implement
        return 'dummy';
    }

    clear(): void {
        // not implement
    }
}