fix(frontend): Linting errors/warnings opgelost

frontend/src/data-objects/learning-paths/learning-path-node.ts

@@ -0,0 +1,57 @@
+import type {Language} from "@/data-objects/language.ts";
+import type {LearningPathNodeDTO} from "@/data-objects/learning-paths/learning-path.ts";
+
+export class LearningPathNode {
+    public readonly learningobjectHruid: string;
+    public readonly version: number;
+    public readonly language: Language;
+    public readonly transitions: { next: LearningPathNode, default: boolean }[];
+    public readonly createdAt: Date;
+    public readonly updatedAt: Date;
+    public readonly done: boolean;
+
+    constructor(options: {
+        learningobjectHruid: string,
+        version: number,
+        language: Language,
+        transitions: { next: LearningPathNode, default: boolean }[],
+        createdAt: Date,
+        updatedAt: Date,
+        done?: boolean
+    }) {
+        this.learningobjectHruid = options.learningobjectHruid;
+        this.version = options.version;
+        this.language = options.language;
+        this.transitions = options.transitions;
+        this.createdAt = options.createdAt;
+        this.updatedAt = options.updatedAt;
+        this.done = options.done || false;
+    }
+
+    static fromDTOAndOtherNodes(dto: LearningPathNodeDTO, otherNodes: LearningPathNodeDTO[]): LearningPathNode {
+        return new LearningPathNode({
+            learningobjectHruid: dto.learningobject_hruid,
+            version: dto.version,
+            language: dto.language,
+            transitions: dto.transitions.map(transDto => {
+                const nextNodeDto = otherNodes.filter(it =>
+                    it.learningobject_hruid === transDto.next.hruid
+                    && it.language === transDto.next.language
+                    && it.version === transDto.next.version
+                );
+                if (nextNodeDto.length !== 1) {
+                    throw new Error(`Invalid learning path! There is a transition to node`
+                        + `${transDto.next.hruid}/${transDto.next.language}/${transDto.next.version}, but there are`
+                        + `${nextNodeDto.length} such nodes.`);
+                }
+                return {
+                    next: LearningPathNode.fromDTOAndOtherNodes(nextNodeDto[0], otherNodes),
+                    default: transDto.default
+                }
+            }),
+            createdAt: new Date(dto.created_at),
+            updatedAt: new Date(dto.updatedAt),
+            done: dto.done
+        })
+    }
+}