fix eslint warnigs for core project (#7506)

lib/core/models/file.model.spec.ts

@@ -22,25 +22,25 @@ describe('FileModel', () => {
     describe('extension', () => {
 
         it('should return the extension if file has it', () => {
-            const file = new FileModel(<File> { name: 'tyrion-lannister.doc' });
+            const file = new FileModel({ name: 'tyrion-lannister.doc' } as File);
 
             expect(file.extension).toBe('doc');
         });
 
         it('should return the empty string if file has NOT got it', () => {
-            const file = new FileModel(<File> { name: 'daenerys-targaryen' });
+            const file = new FileModel({ name: 'daenerys-targaryen' } as File);
 
             expect(file.extension).toBe('');
         });
 
         it('should return the empty string if file is starting with . and doesn\'t have extension', () => {
-            const file = new FileModel(<File> { name: '.white-walkers' });
+            const file = new FileModel({ name: '.white-walkers' } as File);
 
             expect(file.extension).toBe('');
         });
 
         it('should return the last extension string if file contains many dot', () => {
-            const file = new FileModel(<File> { name: 'you.know.nothing.jon.snow.exe' });
+            const file = new FileModel({ name: 'you.know.nothing.jon.snow.exe' } as File);
 
             expect(file.extension).toBe('exe');
         });

lib/core/models/file.model.ts

@@ -74,6 +74,7 @@ export class FileUploadOptions {
     versioningEnabled?: boolean;
 }
 
+// eslint-disable-next-line no-shadow
 export enum FileUploadStatus {
     Pending = 0,
     Complete = 1,

lib/core/models/log-levels.model.ts

@@ -24,7 +24,7 @@ export class LogLevelsEnum extends Number {
     static SILENT: number = 0;
 }
 
-export let logLevels: any[] = [
+export const logLevels: any[] = [
     {level: LogLevelsEnum.TRACE, name: 'TRACE'},
     {level: LogLevelsEnum.DEBUG, name: 'DEBUG'},
     {level: LogLevelsEnum.INFO, name: 'INFO'},

lib/core/models/search-text-input.model.ts

@@ -15,6 +15,7 @@
  * limitations under the License.
  */
 
+// eslint-disable-next-line no-shadow
 export enum SearchTextStateEnum {
     expanded = 'expanded',
     collapsed = 'collapsed'