Method delete

jsonrpc/src/linkedMap.ts:90–99

(key: K)

	}

	public delete(key: K): boolean {
		const item = this._map.get(key);
		if (!item) {
			return false;
		}
		this._map.delete(key);
		this.removeItem(item);
		this._size--;
		return true;
	}

	public shift(): V | undefined {
		if (!this._head && !this._tail) {