harden business rules

core/racing/domain/value-objects/RaceName.ts

@@ -0,0 +1,38 @@
+import type { IValueObject } from '@core/shared/domain';
+
+export interface RaceNameProps {
+  value: string;
+}
+
+export class RaceName implements IValueObject<RaceNameProps> {
+  public readonly props: RaceNameProps;
+
+  private constructor(value: string) {
+    if (!value || !value.trim()) {
+      throw new Error('Race name cannot be empty');
+    }
+    if (value.trim().length < 3) {
+      throw new Error('Race name must be at least 3 characters long');
+    }
+    if (value.trim().length > 100) {
+      throw new Error('Race name must not exceed 100 characters');
+    }
+    this.props = { value: value.trim() };
+  }
+
+  public static fromString(value: string): RaceName {
+    return new RaceName(value);
+  }
+
+  get value(): string {
+    return this.props.value;
+  }
+
+  public toString(): string {
+    return this.props.value;
+  }
+
+  public equals(other: IValueObject<RaceNameProps>): boolean {
+    return this.props.value === other.props.value;
+  }
+}