text: export class Triangle {
    constructor(a, b, c) {
      this.a = a;
      this.b = b;
      this.c = c;
    }
  
    kind() {
      const a = this.a;
      const b = this.b;
      const c = this.c;
      if (a >= b + c || b >= c + a || c >= a + b || a <= 0 || b <= 0 || c <= 0) {
        throw new Error()
      }
      return a !== b || b !== c ? (b === c || c === a || a === b ? 'isosceles' : 'scalene') : 'equilateral';
    }
  }