idmahoro0695

설명대로 다운로드받은 폴더에서 복사하고
새로 생성한 프로젝트에 붙여넣기했는데 저도 저 위와 같은 오류문구가 나오네요
./src/app/services/item.service.ts:2:0-41 - Error: Module not found: Error: Can't resolve 'firebase/app' in 'C:\Users\jun\Documents\angular-08liter\angular-petlist\src\app\services'

./src/app/services/item.service.ts:3:0-27 - Error: Module not found: Error: Can't resolve 'firebase/database' in 'C:\Users\jun\Documents\angular-08liter\angular-petlist\src\app\services'

Error: src/app/classes/item.ts:2:5 - error TS2564: Property 'key' has no initializer and is not definitely assigned in the constructor.

2&nbsp; &nbsp; &nbsp;key: string;
&nbsp; &nbsp; &nbsp; ~~~


Error: src/app/classes/item.ts:3:5 - error TS2564: Property 'id' has no initializer and is not definitely assigned in the constructor.

3&nbsp; &nbsp; &nbsp;id: string;
&nbsp; &nbsp; &nbsp; ~~


Error: src/app/classes/item.ts:4:5 - error TS2564: Property 'name' has no initializer and is not definitely assigned in the constructor.

4&nbsp; &nbsp; &nbsp;name: string;
&nbsp; &nbsp; &nbsp; ~~~~


Error: src/app/classes/item.ts:5:5 - error TS2564: Property 'available' has no initializer and is not definitely assigned in the constructor.

5&nbsp; &nbsp; &nbsp;available: boolean;
&nbsp; &nbsp; &nbsp; ~~~~~~~~~


Error: src/app/item/item.component.html:4:27 - error TS2341: Property 'item' is private and only accessible within class 'ItemComponent'.

4&nbsp; &nbsp; &nbsp; &nbsp;<input [(ngModel)]="item.id" placeholder="ID"/>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ~~~~

&nbsp; src/app/item/item.component.ts:8:16
&nbsp; &nbsp; 8&nbsp; &nbsp;templateUrl: './item.component.html',
&nbsp; &nbsp; &nbsp; m&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;~~~~~~~~~~~~~~~~~~~~~~~
&nbsp; &nbsp; Error occurs in the template of component ItemComponent.


Error: src/app/item/item.component.html:4:27 - error TS2341: Property 'item' is private and only accessible within class 'ItemComponent'.

4&nbsp; &nbsp; &nbsp; &nbsp;<input [(ngModel)]="item.id" placeholder="ID"/>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ~~~~

&nbsp; src/app/item/item.component.ts:8:16
&nbsp; &nbsp; 8&nbsp; &nbsp;templateUrl: './item.component.html',
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;~~~~~~~~~~~~~~~~~~~~~~~
&nbsp; &nbsp; Error occurs in the template of component ItemComponent.


Error: src/app/item/item.component.html:9:27 - error TS2341: Property 'item' is private and only accessible within class 'ItemComponent'.

9&nbsp; &nbsp; &nbsp; &nbsp;<input [(ngModel)]="item.name" placeholder="Name"/>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ~~~~

&nbsp; src/app/item/item.component.ts:8:16
&nbsp; &nbsp; 8&nbsp; &nbsp;templateUrl: './item.component.html',
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;~~~~~~~~~~~~~~~~~~~~~~~
&nbsp; &nbsp; Error occurs in the template of component ItemComponent.


Error: src/app/item/item.component.html:9:27 - error TS2341: Property 'item' is private and only accessible within class 'ItemComponent'.

9&nbsp; &nbsp; &nbsp; &nbsp;<input [(ngModel)]="item.name" placeholder="Name"/>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ~~~~

&nbsp; src/app/item/item.component.ts:8:16
&nbsp; &nbsp; 8&nbsp; &nbsp;templateUrl: './item.component.html',
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;~~~~~~~~~~~~~~~~~~~~~~~
&nbsp; &nbsp; Error occurs in the template of component ItemComponent.


Error: src/app/item/item.component.html:14:27 - error TS2341: Property 'item' is private and only accessible within class 'ItemComponent'.

14&nbsp; &nbsp; &nbsp; &nbsp;<input [(ngModel)]="item.available" type="checkbox"/>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;~~~~

&nbsp; src/app/item/item.component.ts:8:16
&nbsp; &nbsp; 8&nbsp; &nbsp;templateUrl: './item.component.html',
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;~~~~~~~~~~~~~~~~~~~~~~~
&nbsp; &nbsp; Error occurs in the template of component ItemComponent.


Error: src/app/item/item.component.html:14:27 - error TS2341: Property 'item' is private and only accessible within class 'ItemComponent'.

14&nbsp; &nbsp; &nbsp; &nbsp;<input [(ngModel)]="item.available" type="checkbox"/>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;~~~~

&nbsp; src/app/item/item.component.ts:8:16
&nbsp; &nbsp; 8&nbsp; &nbsp;templateUrl: './item.component.html',
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;~~~~~~~~~~~~~~~~~~~~~~~
&nbsp; &nbsp; Error occurs in the template of component ItemComponent.


Error: src/app/item/item.component.ts:34:9 - error TS2322: Type 'Item | undefined' is not assignable to type 'Item'.
&nbsp; Type 'undefined' is not assignable to type 'Item'.

34&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;this.item = this.itemService.getItem(id);
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;~~~~~~~~~


Error: src/app/services/item.service.ts:4:27 - error TS2307: Cannot find module 'firebase/app' or its corresponding type declarations.

4 import * as firebase from 'firebase/app';
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ~~~~~~~~~~~~~~


Error: src/app/services/item.service.ts:36:33 - error TS7006: Parameter 'snapshot' implicitly has an 'any' type.

36&nbsp; &nbsp; &nbsp; &nbsp;this.itemList.on('value', snapshot => {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;~~~~~~~~


Error: src/app/services/item.service.ts:37:27 - error TS7006: Parameter 'snap' implicitly has an 'any' type.

37&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;snapshot.forEach( snap => {

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