initial

frontend/app/types.ts

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+// TypeScript variants of the Java classes.
+// Typically, standalone DTOs (Data Transfer Objects) are used to communicate with the backend,
+// but we'll keep it simple here.
+
+export type UiPropertyType = "number" | "string" | "text";
+
+export class TypeProperty {
+  constructor(public name: string, public type: UiPropertyType) {}
+}
+
+export class DataType {
+  constructor(
+    public id: string,
+    public name: string,
+    public properties: TypeProperty[]
+  ) {}
+
+  static empty(): DataType {
+    return new DataType("", "", []);
+  }
+}
+
+export class DataTypeConfiguration {
+  constructor(public dataTypes: DataType[]) {}
+}
+
+export type Runnable = () => void;