app/mocks.ts(1,2): error TS1109: Expression expected - angularjs

Question

I'm learning Angular and after some time I've run into this problem with a mocks.ts file:
1) mocks.ts looks like this:
#import { Races } from './races';
export const RACES: Races[] = [{
"id": 1,
"name": "Daytona Thunderdome",
"date": new Date('2512-01-04T14:00:00'),
"about": "Race through the ruins of an ancient Florida battle arena.",
"entryFee": 3200,
"isRacing": false
}, {
"id": 2,
"name": "San Francisco Ruins",
"date": new Date('2512-07-03T20:00:00'),
"about": "Drift down the streets of a city almost sunk under the ocean.",
"entryFee": 4700,
"isRacing": true
}, {
"id": 3,
"name": "New York City Skyline",
"date": new Date('2512-07-12T21:00:00'),
"about": "Fly between buildings in the electronic sky.",
"entryFee": 4300,
"isRacing": true
}];
2)I'm importing Races from races.ts file, which looks like this:
export class Races {
"id": number;
"name": string;
"date": string;
"about": string;
"entryFee": number;
"isRacing": boolean;
}
3) And than I'm importing RACES to races.component.ts, which looks like this:
import { Component } from '#angular/core';
import { Races } from './races';
import { RACES } from './mocks';
#Component({
selector: 'races',
templateUrl: 'app/races.component.html',
styleUrls: ['app/races.component.css']
})
export class RacesComponent {
races: Races[];
cash = 10000;
ngOnInit() {
this.races = RACES;
};
// Write your function here
totalCost() {
var sum = 0;
for(let race of this.races) {
if(race.isRacing) {
sum += race.entryFee;
}
}
return sum;
};
}
Any help is very much appreciated!
Thanks!