How to use the fabric-contract-api.Info function in fabric-contract-api

/*
 * <%= spdxAndLicense // SPDX-License-Identifier: Apache-2.0 %>
 */

import { Context, Contract, Info, Returns, Transaction } from 'fabric-contract-api';
import { MyAsset } from './my-asset';

@Info({title: 'MyContract', description: '<%= description %>' })
export class MyContract extends Contract {

    @Transaction(false)
    @Returns('boolean')
    public async assetExists(ctx: Context, assetId: string): Promise {
        const buffer = await ctx.stub.getState(assetId);
        return (!!buffer && buffer.length > 0);
    }

    @Transaction()
    public async createAsset(ctx: Context, assetId: string, value: string): Promise {
        const exists = await this.assetExists(ctx, assetId);
        if (exists) {
            throw new Error(`The asset ${assetId} already exists`);
        }
        const asset = new MyAsset();

* the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { Contract, Info, Returns, Transaction } from 'fabric-contract-api';
import Greeting from './greeting';
import GreetingContext from './greetingcontext';

@Info({title: 'GreetingContract', description: 'The description'})
export class GreetingContract extends Contract {

    public constructor() {
        super('Greeting');
    }

    /**
     * Define a custom context for commercial paper
     */
    public createContext() {
       return new GreetingContext();
    }

    @Transaction()
    public async instantiate(ctx: GreetingContext): Promise {
        const greeting = { text: 'Hi' };