in-memory-cache.provider.ts

import { InMemoryCacheService } from './in-memory-cache.service';

export const IN_MEMORY_CACHE_PROVIDERS = [
    InMemoryCacheService
];

in-memory-cache.service.ts

import { Injectable } from '@angular/core';
export let inMemoryCache = {};

@Injectable()
export class InMemoryCacheService {

    public has(key: string): boolean {
        return inMemoryCache[key] !== null;
    }

    public get(key: string): any {
        return inMemoryCache[key] || null;
    }

    public set(key: string, value: any): void {
        inMemoryCache[key] = value;
    }

    public remove(key: string): void {
        delete inMemoryCache[key];
    }

    public clear(): void {
        inMemoryCache = {};
    }
}