1/*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16/**
17 * A generic stack class.
18 * @template T - The type of elements in the stack.
19 */
20declare class Stack<T> {
21    /**
22     * Constructor for Stack.
23     */
24    constructor();
25
26    /**
27     * Pushes an element onto the stack.
28     * @param {T} element - The element to push.
29     */
30    push(element: T): void;
31
32    /**
33     * Pops an element from the stack.
34     * @returns {T} The popped element.
35     */
36    pop(): T;
37
38    /**
39     * Gets the size of the stack.
40     * @returns {number} The size of the stack.
41     */
42    size(): number;
43}
44
45/**
46 * An interface representing a geometric shape.
47 * @interface
48 */
49declare interface GeometricShape {
50  /**
51   * Calculates the area of the shape.
52   * @returns {number} The area of the shape.
53   */
54  calculateArea(): number;
55}
56
57/**
58 * A function to capitalize the first letter of a string.
59 * @param {string} str - The input string.
60 * @returns {string} The capitalized string.
61 */
62declare function capitalizeFirstLetter(str: string): string;
63