solution

package.json

@@ -19,7 +19,7 @@
     "@babel/preset-env": "^7.24.8",
     "@babel/preset-typescript": "^7.24.7",
     "@mate-academy/eslint-config": "latest",
-    "@mate-academy/scripts": "^1.9.5",
+    "@mate-academy/scripts": "^2.1.3",
     "@mate-academy/students-ts-config": "latest",
     "@types/jest": "^29.5.12",
     "@types/node": "^20.14.10",

src/figuresClasses.ts

@@ -1,11 +1,80 @@
-export interface Figure {}
+export type Shape = 'triangle' | 'circle' | 'rectangle';
+export type Color = 'red' | 'green' | 'blue';
+export interface Figure {
+  shape: Shape;
+  color: Color;
+  getArea(): number;
+}
+
+export class Triangle implements Figure {
+  readonly shape: Shape = 'triangle';
+
+  constructor(
+    public readonly color: Color,
+    private readonly a: number,
+    private readonly b: number,
+    private readonly c: number,
+  ) {
+    if (a <= 0 || b <= 0 || c <= 0) {
+      throw new Error('The side length is less than or equal to zero.');
+    }
+
+    const maxSide = Math.max(a, b, c);
+    const sumLengthTwoSides = a + b + c - maxSide;
+
+    if (maxSide >= sumLengthTwoSides) {
+      throw new Error('Length of the longer side: invalid value');
+    }
+  }
+
+  getArea(): number {
+    const s: number = (this.a + this.b + this.c) / 2;
+
+    return (
+      Math.floor(
+        Math.sqrt(s * (s - this.a) * (s - this.b) * (s - this.c)) * 100,
+      ) / 100
+    );
+  }
+}
+
+export class Circle implements Figure {
+  readonly shape: Shape = 'circle';
 
-export class Triangle implements Figure {}
+  constructor(
+    public readonly color: Color,
+    private readonly radius: number,
+  ) {
+    if (this.radius <= 0) {
+      throw new Error('The radius is equal to zero.');
+    }
+  }
+
+  getArea(): number {
+    return Math.floor(Math.PI * this.radius ** 2 * 100) / 100;
+  }
+}
 
-export class Circle implements Figure {}
+export class Rectangle implements Figure {
+  readonly shape: Shape = 'rectangle';
+
+  constructor(
+    public readonly color: Color,
+    private readonly width: number,
+    private readonly hight: number,
+  ) {
+    if (this.width <= 0 || this.hight <= 0) {
+      throw new Error('The side length is less than or equal to zero.');
+    }
+  }
+
+  getArea(): number {
+    return Math.floor(this.width * this.hight * 100) / 100;
+  }
+}
 
-export class Rectangle implements Figure {}
+export function getInfo(figure: Figure): string {
+  const calcArea = figure.getArea();
 
-export function getInfo(figure): string {
-  return typeof figure;
+  return `A ${figure.color} ${figure.shape} - ${calcArea}`;
 }